Datasheet ADuC7060, ADuC7061 Datasheet (ANALOG DEVICES)

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Low Power, Precision Analog Microcontroller

Dual

Sigma-Delta ADCs,

FEATURES

Analog input/output

Dual (24-bit) ADCs Single-ended and differential inputs Programmable ADC output rate (4 Hz to 8 kHz) Programmable digital filters Built-in system calibration Low power operation mode

Primary (24-bit) ADC channel

2 differential pairs or 4 single-ended channels PGA (1 to 512) input stage Selectable input range: ±2.34 mV to ±1.2 V 30 nV rms noise

Auxiliary (24-bit) ADC: 4 differential pairs or 7 single-

ended channels On-chip precision reference (±10 ppm/°C) Programmable sensor excitation current sources

200 μA to 2 mA current source range

Single 14-bit voltage output DAC

Microcontroller

ARM7TDMI core, 16-/32-bit RISC architecture JTAG port supports code download and debug Multiple clocking options

Memory

32 kB (16 kB × 16) Flash/EE memory, including 2 kB kernel 4 kB (1 kB × 32) SRAM

Tools

In-circuit download, JTAG based debug Low cost, QuickStart™ development system

Communications interfaces SPI interface (5 Mbps)

4-byte receive and transmit FIFOs

UART serial I/O and I On-chip peripherals

4× general-purpose (capture) timers including

Wake -up timer Watchdog timer

Vectored interrupt controller for FIQ and IRQ

8 priority levels for each interrupt type Interrupt on edge or level external pin inputs

16-bit, 6-channel PWM General-purpose inputs/outputs

Up to 14 GPIO pins that are fully 3.3 V compliant

Power

AVDD/DVDD specified for 2.5 V (±5%) Active mode: 2.74 mA (@ 640 kHz, ADC0 active) 10 mA (@ 10.24 MHz, both ADCs active)

Rev. C

Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Anal og Devices for its use, nor for any infringements of patents or ot her rights of third parties that may result from its use. Specifications subject to change without notice. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Trademarks and registered trademarks are the property of their respective owners.

C (master/slave)

Flash/EE, ARM7TDMI

ADuC7060/ADuC7061

Packages and temperature range

Fully specified for −40°C to +125°C operation 32-lead LFCSP (5 mm × 5 mm) 48-lead LFCSP and LQFP

Derivatives

32-lead LFCSP (ADuC7061) 48-lead LQFP and 48-lead LFCSP (ADuC7060)

APPLICATIONS

Industrial automation and process control Intelligent, precision sensing systems, 4 mA to 20 mA

loop-based smart sensors

GENERAL DESCRIPTION

The ADuC706x series are fully integrated, 8 kSPS, 24-bit data acquisition systems incorporating high performance multichannel sigma-delta (Σ-) analog-to-digital converters (ADCs), 16-bit/ 32-bit ARM7TDMI® MCU, and Flash/EE memory on a single chip.

The ADCs consist of a primary ADC with two differential pairs or four single-ended channels and an auxiliary ADC with up to seven channels. The ADCs operate in single-ended or differential input mode. A single-channel buffered voltage output DAC is available on chip. The DAC output range is programmable to one of four voltage ranges.

The devices operate from an on-chip oscillator and a PLL generating an internal high frequency clock up to 10.24 MHz. The microcontroller core is an ARM7TDMI, 16-bit/32-bit RISC machine offering up to 10 MIPS peak performance; 4 kB of SRAM and 32 kB of nonvolatile Flash/EE memory are provided on chip. The ARM7TDMI core views all memory and registers as a single linear array.

The ADuC706x contains four timers. Timer1 is a wake-up timer with the ability to bring the part out of power saving mode. Timer2 is configurable as a watchdog timer. A 16-bit PWM with six output channels is also provided. The ADuC706x contains an advanced interrupt controller. The vectored interrupt controller (VIC) allows every interrupt to be assigned a priority level. It also supports nested interrupts to a maximum level of eight per IRQ and FIQ. When IRQ and FIQ interrupt sources are combined, a total of 16 nested interrupt levels is supported. On-chip factory firmware supports in-circuit serial download via the UART serial interface ports and nonintrusive emulation via the JTAG interface. The parts operate from 2.375 V to 2.625 V over an industrial temperature range of −40°C to +125°C.

Page 2

ADuC7060/ADuC7061

Features.............................................................................................. 1

Applications....................................................................................... 1

General Description ......................................................................... 1

Revision History ............................................................................... 3

Functional Block Diagram .............................................................. 4

Specifications..................................................................................... 5

Electrical Specifications............................................................... 5

Timing Specifications ................................................................10

Absolute Maximum Ratings.......................................................... 14

ESD Caution................................................................................ 14

Pin Configurations and Function Descriptions ......................... 15

Terminology .................................................................................... 20

Overview of the ARM7TDMI Core ............................................. 21

Thumb Mode (T)........................................................................ 21

Multiplier (M)............................................................................. 21

EmbeddedICE (I) ....................................................................... 21

ARM Registers ............................................................................ 21

Interrupt Latency........................................................................ 22

Memory Organization ............................................................... 22

Flash/EE Control Interface........................................................ 23

Memory Mapped Registers....................................................... 27

Complete MMR Listing............................................................. 28

Reset .............................................................................................33

Oscillator, PLL, and Power Control .............................................34

Clocking System ......................................................................... 34

Power Control System................................................................ 34

ADC Circuit Information.............................................................. 38

Reference Sources....................................................................... 39

Diagnostic Current Sources...................................................... 39

Sinc3 Filter................................................................................... 40

ADC Chopping........................................................................... 40

Programmable Gain Amplifier................................................. 40

Excitation Sources...................................................................... 40

ADC Low Power Mode.............................................................. 40

ADC Comparator and Accumulator .......................................41

Temperature Sensor ................................................................... 41

ADC MMR Interface .................................................................41

Example Application Circuits................................................... 54

DAC Peripherals............................................................................. 56

DAC.............................................................................................. 56

Rev. C | Page 2 of 108

MMR Interface ........................................................................... 56

Using the DAC............................................................................ 57

Nonvolatile Flash/EE Memory ..................................................... 58

Flash/EE Memory Reliability.................................................... 58

Programming.............................................................................. 58

Processor Reference Peripherals................................................... 59

Interrupt System......................................................................... 59

IRQ............................................................................................... 59

Fast Interrupt Request (FIQ) .................................................... 60

Programmed Interrupts............................................................. 61

Vectored Interrupt Controller (VIC)....................................... 61

VIC MMRs.................................................................................. 61

Timers .............................................................................................. 66

Timer0.......................................................................................... 67

Timer1 or Wake-Up Timer....................................................... 69

Timer2 or Watchdog Timer...................................................... 71

Timer3.......................................................................................... 73

Pulse-Width Modulator................................................................. 75

Pulse-Width Modulator General Overview ........................... 75

UART Serial Interface.................................................................... 80

Baud Rate Generation................................................................ 80

UART Register Definitions....................................................... 80

I2C..................................................................................................... 86

Configuring External Pins for I2C Functionality................... 86

Serial Clock Generation ............................................................ 87

I2C Bus Addresses....................................................................... 87

I2C Registers................................................................................ 87

Serial Peripheral Interface............................................................. 96

MISO (Master In, Slave Out) Pin............................................. 96

MOSI (Master Out, Slave In) Pin............................................. 96

SCLK (Serial Clock I/O) Pin..................................................... 96

Slave Select (P0.0/SS) Input Pin ............................................... 96

Configuring External Pins for SPI Functionality................... 96

SPI Registers................................................................................ 97

General-Purpose I/O ................................................................... 101

GPxCON Registers................................................................... 101

GPxDAT Registers ................................................................... 102

GPxSET Registers..................................................................... 102

GPxCLR Registers.................................................................... 102

GPxPAR Registers .................................................................... 102

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ADuC7060/ADuC7061

Hardware Design Considerations.............................................. 104

Power Supplies.......................................................................... 104

REVISION HISTORY

5/11—Rev. B to Rev. C

Change to Figure 1............................................................................4

Changes to Table 1 ............................................................................6

Add Temporary Protection Section and Keyed Permanent

Protection Section...........................................................................25

Added Permanent Protection Section and Sequence to Write the Software Protection Key and Set Permanent Protection

Section ..............................................................................................26

Changes to Power Control System Section..................................35

Changes to Bit 9:6, Table 43 ...........................................................45

Changes to Primary Channel ADC Data Register Section and

Table 49.............................................................................................50

Changes to IRQEN Section and IRQCLR Section .....................59

Changes to Timer1 or Wake-Up Timer Section .........................69

Changes to Table 108 ....................................................................101

2/10—Rev. A to Rev. B

Changes to Features Section............................................................1

Changes to Table 1 ............................................................................4

Changes to Digital I/O Voltage to DGND Parameter ................14

Changes to Pin 19, Pin 20, and Pin 45 Descriptions (Table 8)..16 Changes to Pin 13, Pin 14, and Pin 29 Descriptions (Table 9)..18

Changes to Bit 8 in Table 14...........................................................23

Changes to Table 20 ........................................................................28

Changes to Power Control System Section..................................34

Added Table 32 ................................................................................35

Changes to Endnote 2 and Endnote 3 of Table 34 ......................36

Changes to Table 42 ........................................................................42

Changes to Bit 12 and Bits[3:0] in Table 43 .................................44

Changes to Bit 12 in Table 44 ........................................................45

Changes to Endnote 2 in Table 45.................................................47

Changes to Bit 5 in Table 63...........................................................55

Changes to Serial Downloading (In-Circuit Programming)

Section ..............................................................................................57

Changes to Priority Registers Section ..........................................61

Changes to GPxPAR Registers Section ......................................101

6/09—Rev. 0 to Rev. A

Added ADuC7061.............................................................. Universal

Added New Package CP-32-4........................................... Universal

Changes to Features Section............................................................1

Changes to General Description Section .......................................1

Changes to Figure 1...........................................................................4

Outline Dimensions......................................................................105

Ordering Guide.........................................................................106

Changes to Table 1 ............................................................................7

Deleted Endnote to Table 2............................................................10

Changes to Endnotes, Table 3 and Table 4...................................11

Changes to Endnotes, Table 5........................................................12

Changes to Endnotes, Table 6........................................................13

Changes to Figure 7 and Table 8 ...................................................15

Added Figure 8 and Table 9, Renumbered Sequentially............18

Changes to Flash EE/Control Interface Section..........................23

Change to Code 0x04 Description, Table 15...............................24

Change to Bit 31 Description, Table 16........................................25

Changes to Table 17 ........................................................................27

Changes to Table 19 T0CLRI and Table 20..................................28

Changes to Endnote, Table 21 .......................................................29

Change to SPITX Default Value, Table 25...................................30

Changes to External Clock Selection Section .............................33

Changes to ADC Circuit Information Section............................36

Change to Column Heading Table 35 ..........................................37

Change to Bit 6 Description, Table 39..........................................40

Change to Bit 12 Description, Table 43........................................44

Changes to Primary Channel ADC Data Register Section

and Auxiliary Channel ADC Data Register Section ..................48

Change to Table 59 and Figure 17.................................................51

Changes to Using the DAC Section .............................................. 55

Changes to Nonvolatile Flash/EE Memory Section and

Programming Section.....................................................................56

Changes to Vectored Interrupt Controller (VIC) Section.........59

Changes to Priority Registers Section ..........................................60

Change to Table 73..........................................................................61

Changes to Figure 23......................................................................65

Changes Table 78.............................................................................66

Changes to Figure 24 and Table 79 ............................................... 68

Changes to Timer2 Interface Section and Figure 25 ..................69

Changes to Timer3 Capture Register Section .............................71

Change to Bits[16:12] Description, Table 81...............................72

Changes Pulse-Width Modulator General Overview Section,

Table 82, and Figure 26...................................................................73

Changes to Table 84 Column Headings.......................................75

Changes to Table 92 ........................................................................82

Changes to Bit 1, Table 102............................................................90

Changes to Bit 11 Description, Table 105 ....................................95

Changes to SPIMDE Bit Description, Table 106.........................97

Updated Outline Dimensions......................................................103

Changes to Ordering Guide.........................................................104

4/09—Revision 0: Initial Version

Rev. C | Page 3 of 108

Page 4

ADuC7060/ADuC7061

FUNCTIONAL BLOCK DIAGRAM

ADC0 ADC1

ADC2 ADC3 ADC4 ADC5 ADC6 ADC7 ADC8 ADC9

IEXC0 IEXC1

DAC0

VREF+

VREF–

GND_SW

PRECISIO N ANALOG P ERIPHERALS

MUX

BUF

MUX

14-BIT

DAC

PGA

BUF

PRECISION

REFERENCE

TEMP

SENSOR

24-BIT

Σ-∆ ADC

24-BIT

Σ-∆

ADC

POR

ARM7TDMI

MCU

10MHz

4× TIME RS

WDT

W/U TIMER

PWM

CONTROL LER)

(VECTORED INTERRUPT

MEMORY

32kB FLASH

4kB RAM

ON-CHIP

OSC (3%)

PLL

GPIO PORT

UART PORT

SPI PORT

C PORT

VIC

ADuC7060/

ADuC7061

RESET

XTALI

XTALO

07079-001

Figure 1.

Rev. C | Page 4 of 108

Page 5

ADuC7060/ADuC7061

SPECIFICATIONS

ELECTRICAL SPECIFICATIONS

VDD = 2.5 V ± 5%, VREF+ = 1.2 V, VREF− = GND, f specifications T

= −40°C to +125°C, unless otherwise noted. Output noise specifications can be found in Ta b le 3 6 (primary ADC) and

Tabl e 38 (ADC auxiliary channel).

Table 1. ADuC706x Specifications

Parameter Test Conditions/Comments Min Typ Max Unit

ADC SPECIFICATIONS

For all ADC specifications, assume normal operating mode unless specifically stated otherwise

Conversion Rate1

Chop off, ADC normal operating mode

Chop on, ADC normal operating

mode Chop on, ADC low power mode 1 650 Hz Main Channel

No Missing Codes1 Chop off (f Chop on (f Integral Nonlinearity Offset Error

3, 4

1, 2

Gain = 4 ±15 ppm of FSR

Chop off, offset error is in the

order of the noise for the pro-

grammed gain and update rate

following calibration

Offset Error

Offset Error Drift vs.

Temperature

Full-Scale Error Full-Scale Error

1, 3, 4

Chop on −2.7 ±0.5 +2.7 V

Chop off (with gain ≤ 64) 650/PGA_GAIN nV/°C

Chop on (with gain ≤ 64) 10 nV/°C

1, 6 , 7 , 8

6, 8

Normal mode −1 ±0.5 +1 mV

Low power mode −2 ±1.0 +2 mV

Gain Drift vs. Temperature9 5 ppm/°C PGA Gain Mismatch Error ±0.1 % Power Supply Rejection1 Chop on, ADC = 1 V (gain = 1) 65 dB

Chop on, ADC = 7.8 mV (gain =

128) Chop off, ADC = 1 V (gain = 1) 56 65 dB Auxiliary Channel

No Missing Codes

Chop off (f Chop on (f Integral Nonlinearity1 ±15 ppm of FSR

Offset Error Offset Error Offset Error Drift vs.

Temperature

1, 4

Chop off −120 ±30 +100 V

Chop on −1.5 ±0.5 +3.2 V

Chop off 200 nV/°C

Chop on 10 nV/°C

Full-Scale Error Full-Scale Error

1, 6, 7, 8

Normal mode −1 ±0.5 +1 mV

1, 6, 8

Low power mode −2 ±1.0 +2 mV

Gain Drift vs. Temperature9 3 ppm/°C Power Supply Rejection1 Chop on, ADC = 1 V 55 65 dB

Chop off, ADC = 1 V 53 65 dB

= 10.24 MHz driven from an external 32.768 kHz watch crystal or on-chip oscillator, all

CORE

50 8000 Hz

4 2600 Hz

≤ 1 kHz) 24 Bits

ADC

≤ 666 Hz) 24 Bits

ADC

−27 ±8 +27 V

84.7 113 dB

≤ 1 kHz) 24 Bits

ADC

≤ 666 Hz) 24 Bits

ADC

Rev. C | Page 5 of 108

Page 6

ADuC7060/ADuC7061

Parameter Test Conditions/Comments Min Typ Max Unit

ADC SPECIFICATIONS: ANALOG

Internal V

INPUT Main Channel

Absolute Input Voltage Range Applies to both VIN+ and VIN− 0.1 VDD − 0.7 V

Input Voltage Range Gain = 11 0 1.2 V Gain = 2 Gain = 4 Gain = 81 0 150 mV Gain = 161 0 75 mV Gain = 321 0 37.5 mV Gain = 641 0 18.75 mV Gain = 1281 0 9.375 mV

Common Mode Voltage, VCM

= (AIN(+) + AIN(−))/2,

gain = 4 to 128

Input Leakage Current

ADC0 and ADC1 10 181 nA

ADC2, ADC3, ADC4, and ADC5 15 301 nA

ADC6, ADC7, ADC8, and ADC9, VREF+, VREF−

Common-Mode Rejection DC1

On ADC Input ADC = 7.8 mV 113 dB ADC = 1 V Common-Mode Rejection

50 Hz/60 Hz

50 Hz/60 Hz ± 1 Hz, 16.6 Hz and

50 Hz update rate, chop on ADC = 7.8 mV, range ± 20 mV 95 dB ADC = 1 V, range ± 1.2 V 90 dB Normal-Mode Rejection

50 Hz/60 Hz

On ADC Input

50 Hz/60 Hz ± 1 Hz, 16.6 Hz f

chop on

50 Hz/60 Hz ± 1 Hz, 16.6 Hz f

chop off

Auxiliary Channel

Absolute Input Voltage

Range

Buffer enabled 0.1 AVDD − 0.1 V

Buffer disabled AGND AVDD V Input Voltage Range Range-based reference source 0 1.2 V Common-Mode Rejection DC1

On ADC Input ADC = 1 V

Common-Mode Rejection

50 Hz/60 Hz

50 Hz/60 Hz ± 1 Hz, 16.6 Hz and

50 Hz update rate, chop on ADC = 1 V, range ± 1.2 V 90 dB Normal-Mode Rejection

50 Hz/60 Hz

On ADC Input

50 Hz/60 Hz ± 1 Hz, 16.6 Hz f

chop on

50 Hz/60 Hz ± 1 Hz, 16.6 Hz f

chop off

VOLTAGE REFERENCE

ADC Precision Reference

Internal V Initial Accuracy Reference Temperature

Coefficient (Tempco)

1.2 V

REF

1, 10

Measured at TA = 25°C −0.1 +0.1 %

−20 ±10 +20 ppm/°C

Power Supply Rejection1 70 dB

= 1.2 V

REF

0 600 mV 0 300 mV

0.5 V

15 25

95 dB

75 dB

ADC

67 dB

ADC

87 dB

75 dB

ADC

67 dB

ADC

Rev. C | Page 6 of 108

Page 7

ADuC7060/ADuC7061

Parameter Test Conditions/Comments Min Typ Max Unit

External Reference Input

Range

REF

Divide-by-2 Initial Error

DAC CHANNEL SPECIFICATIONS RL = 5 kΩ, CL = 100 pF

Voltage Range 0 V 0 AVDD − 0.2 V DAC 12-BIT MODE

DC Specifications12

Resolution 12 Bits Relative Accuracy ±2 LSB Differential Nonlinearity Guaranteed monotonic ±0.2 ±1 LSB Offset Error 1.2 V internal reference ±2 ±15 mV Gain Error V AVDD range ±1 % Gain Error Mismatch 0.1

DAC 16-BIT MODE1 Only monotonic to 14 bits

DC Specifications13

Resolution 14 Bits Relative Accuracy For 14-bit resolution ±3 LSB Differential Nonlinearity Guaranteed monotonic (14 bits) ±0.5 ±1 LSB Offset Error 1.2 V internal reference ±2 ±15 mV Gain Error V AVDD range ±1 % Gain Error Mismatch 0.1

DAC AC CHARACTERISTICS

Voltage Output Settling Time 10 µs

Digital-to-Analog Glitch Energy

TEMPERATURE SENSOR

1, 14

After user calibration

Accuracy

Voltage Output at 0°C Typical value 96 mV

Voltage Tempco Typical value 0.28 mV/°C

Thermal Impedance 48-lead LFCSP 27 °C/W

48-lead LQFP 55 °C/W

32-lead LFCSP 30 °C/W POWER-ON RESET (POR)

POR Trip Level1 Refers to voltage at DVDD pin

Power-on level 2.0 V

Power-down level 2.25 V

RESET Timeout from POR Maximum supply ramp between

0.1 AVDD V

0.1 %

REF

range (reference = 1.2 V) ±1 %

REF

% of full scale on DAC

range (reference = 1.2 V) ±1 %

REF

% of full scale on DAC

1 LSB change at major carry

±20 nV-sec (where maximum number of bits simultaneously change in the DAC0DAT register)

MCU in power-down or standby

±4 °C mode

128 ms

1.8 V and 2.25 V; after POR trip, DVDD must reach 2.25 V within this time limit

Rev. C | Page 7 of 108

Page 8

ADuC7060/ADuC7061

Parameter Test Conditions/Comments Min Typ Max Unit

EXCITATION CURRENT SOURCES

Output Current

Available from each current

source Initial Tolerance at 25°C ±5 % Drift1 0.06 %/°C Initial Current Matching at 25°C

Matching between both current

sources Drift Matching1 20 ppm/°C Line Regulation (AVDD)1 AVDD = 2.5 V ± 5% 0.2 %/V Output Compliance1 AVDD − 0.7 V AGND − 30 mV V

WATCHD OG T IME R ( WDT )

Timeout Period

32.768 kHz clock, 256 prescale 0.008 512 sec

Timeout Step Size 7.8 ms

FLASH/EE MEMORY

Endurance15 10,000 Cycles Data Retention

20 Years

DIGITAL INPUTS All digital inputs except NTRST

Input Leakage Current Input (high) = DVDD ±1 ±10 µA Input Pull-Up Current Input (low) = 0 V 10 20 80 µA Input Capacitance 10 pF Input Leakage Current NTRST only: input (low) = 0 V ±1 ±10 µA Input Pull-Down Current NTRST only: input (high) = DVDD 30 55 100 µA

LOGIC INPUTS

All logic inputs Input Low Voltage (VINL) 0.4 V Input High Voltage (VINH) 2.0 V

LOGIC OUTPUTS1 All logic outputs except XTALO

Output Low Voltage (VOL) I Output High Voltage (VOH) I

CRYSTAL OSCILLATOR

= 1.6 mA 0.6 V

SOURCE

= 1.6 mA 2.0 V

SOURCE

Logic Inputs, XTALI Only

Input Low Voltage (VINL) 0.8 V

Input High Voltage (VINH) 1.7 V XTALI Capacitance 12 pF XTALO Capacitance 12 pF

ON-CHIP OSCILLATORS

Oscillator 32,768 kHz

Accuracy −3 +3 %

MCU CLOCK RATE

Eight programmable core clock selections within this range: binary divisions 1, 2, 4, 8 . . . 64, 128

Using an External Clock to

0.08 10.24 MHz

P2.0/EXTCLK Pin

MCU START-UP TIME

At Power-On

Includes kernel power-on execution time

After Reset Event

Includes kernel power-on execution time

From MCU Power-Down

PLL On

Wake-Up from Interrupt CD = 0 4.8 s

PLL Off

Wake-Up from Interrupt CD = 0 66 s Internal PLL Lock Time 1 ms

200 1000 A

±0.5 %

0.08 1.28 10.24 MHz

134 ms

5 ms

Rev. C | Page 8 of 108

Page 9

ADuC7060/ADuC7061

Parameter Test Conditions/Comments Min Typ Max Unit

POWER REQUIREMENTS

Power Supply Voltages

DVDD (±5%) 2.375 2.5 2.625 V AVDD (±5%) 2.375 2.5 2.625 V

Power Consumption

IDD (MCU Normal Mode)17

MCU clock rate = 10.24 MHz, ADC0 on

MCU clock rate = 640 kHz, ADC0 on, G = 4, ADC1/DAC off, SPI on; POWCON1 = 0x4

Full temperature range 3.1 mA

Reduced temperature range

−40°C to +85°C

IDD (MCU Powered Down)1 Full temperature range 55 350 µA

Reduced temperature range

−40°C to +85°C

IDD (Primary ADC)

PGA enabled, normal mode/low power mode; current is

dependent on gain setting ADC0 on, G = 1, normal mode 0.03 mA ADC0 on, G = 4, normal mode 0.44 mA ADC0 on, G = >128, normal mode 0.63 mA IDD (Auxiliary ADC) Normal mode/low power mode 0.35/0.1 mA IDD (DAC) DAC0CON = 0x10 0.33 mA PWM 0.34 mA

These numbers are not production tested but are guaranteed by design and/or characterization data at production release.

Valid for primary ADC gain setting of PGA = 4 to 64.

Tested at gain range = 4 after initial offset calibration.

Measured with an internal short. A system zero-scale calibration removes this error.

Measured with an internal short.

These numbers do not include internal reference temperature drift.

Factory calibrated at gain = 1.

System calibration at a specific gain range removes the error at this gain range.

Measured using an external reference.

Measured using the box method.

References up to AVDD are accommodated by setting ADC0CON Bit 12.

Reference DAC linearity is calculated using a reduced code range of 171 to 4095.

Reference DAC linearity is calculated using a reduced code range of 2731 to 65,535.

Die temperature.

Endurance is qualified to 10,000 cycles as per JEDEC Std. 22 Method A117 and measured at −40°C, +25°C, and +125°C. Typical endurance at 25°C is 170,000 cycles.

Retention lifetime equivalent at junction temperature (TJ) = 85°C as per JEDEC Std. 22 Method A117. Retention lifetime derates with junction temperature.

Typical additional supply current consumed during Flash/EE memory program and erase cycles is 7 mA and 5 mA, respectively.

6 10 mA

2.74 mA

55 120 µA

0.6/0.3 mA

Rev. C | Page 9 of 108

Page 10

ADuC7060/ADuC7061

TIMING SPECIFICATIONS

I2C Timing

Table 2. I2C® Timing in Standard Mode (100 kHz)

Slave Parameter Description Min Max Unit

tL SCLOCK low pulse width 4.7 µs tH SCLOCK high pulse width 4.0 ns t

Start condition hold time 4.0 µs

SHD

Data setup time 250 ns

DSU

Data hold time 0 3.45 µs

DHD

Setup time for repeated start 4.7 µs

RSU

Stop condition setup time 4.0 µs

PSU

Bus-free time between a stop condition and a start condition 4.7 µs

BUF

tR Rise time for both CLOCK and SDATA 1 µs tF Fall time for both CLOCK and SDATA 300 ns

BUF

DATA (I/O)

SCLK (I)

PSU

STOP

CONDITIO N

CONDITION

START

MSB LSB ACK MSB

DSU

SHD

DHD

Figure 2. I

C Compatible Interface Timing

DSU

RSU

DHD

REPEATED

START

S(R)

1982–71

7079-029

Rev. C | Page 10 of 108

Page 11

ADuC7060/ADuC7061

SPI Timing

Table 3. SPI Master Mode Timing (Phase Mode = 1)

Parameter Description Min Typ Max Unit tSL SCLOCK low pulse width (SPIDIV + 1) × t tSH SCLOCK high pulse width (SPIDIV + 1) × t t

Data output valid after SCLOCK edge 25 ns

DAV

Data input setup time before SCLOCK edge1 1 × t

DSU

Data input hold time after SCLOCK edge1 2 × t

DHD

UCLK

tDF Data output fall time 30 40 ns tDR Data output rise time 30 40 ns tSR SCLOCK rise time 30 40 ns tSF SCLOCK fall time 30 40 ns

= 97.6 ns. It corresponds to the 10.24 MHz internal clock from the PLL.

UCLK

HCLK

SCLOCK

(POLARITY = 0)

SCLOCK

(POLARITY = 1)

MOSI MSB BITS 6 TO 1 LSB

MISO MSB IN BITS 6 TO 1 LSB IN

DAV

DSU

DHD

7079-030

Figure 3. SPI Master Mode Timing (Phase Mode = 1)

Table 4. SPI Master Mode Timing (Phase Mode = 0)

Parameter Description Min Typ Max Unit tSL SCLOCK low pulse width (SPIDIV + 1) × t tSH SCLOCK high pulse width (SPIDIV + 1) × t t

Data output valid after SCLOCK edge 25 ns

DAV

Data output setup before SCLOCK edge 90 ns

DOSU

Data input setup time before SCLOCK edge1 1 × t

DSU

Data input hold time after SCLOCK edge1 2 × t

DHD

UCLK

HCLK

tDF Data output fall time 30 40 ns tDR Data output rise time 30 40 ns tSR SCLOCK rise time 30 40 ns tSF SCLOCK fall time 30 40 ns

= 97.6 ns. It corresponds to the 10.24 MHz internal clock from the PLL.

UCLK

Rev. C | Page 11 of 108

Page 12

ADuC7060/ADuC7061

SCLOCK

(POLARITY = 0)

SCLOCK

(POLARITY = 1)

DOSU

MOSI MSB BITS 6 TO 1 LSB

MISO MSB IN BITS 6 TO 1 LSB IN

DSU

Table 5. SPI Slave Mode Timing (Phase Mode = 1)

Parameter Description Min Typ Max Unit tCS

to SCLOCK edge1

tSL SCLOCK low pulse width (SPIDIV + 1) × t tSH SCLOCK high pulse width (SPIDIV + 1) × t t

Data output valid after SCLOCK edge 40 ns

DAV

Data input setup time before SCLOCK edge1 1 × t

DSU

Data input hold time after SCLOCK edge1 2 × t

DHD

tDF Data output fall time 30 40 ns tDR Data output rise time 30 40 ns tSR SCLOCK rise time 1 ns tSF SCLOCK fall time 1 ns t

SFS

= 97.6 ns. It corresponds to the 10.24 MHz internal clock from the PLL.

UCLK

high after SCLOCK edge

DHD

DAV

Figure 4. SPI Master Mode Timing (Phase Mode = 0)

(2 × t

) + (2 × t

HCLK

UCLK

0 ns

) ns

UCLK

07079-031

HCLK

SCLOCK

(POLARITY = 0)

SCLOCK

(POLARITY = 1)

MISO MSB BITS 6 TO 1 LSB

MOSI MSB IN BITS 6 TO 1 LSB IN

DAV

DSU

DHD

SFS

07079-032

Figure 5. SPI Slave Mode Timing (Phase Mode = 1)

Rev. C | Page 12 of 108

Page 13

ADuC7060/ADuC7061

Table 6. SPI Slave Mode Timing (Phase Mode = 0)

Parameter Description Min Typ Max Unit

tCS

to SCLOCK edge1

tSL SCLOCK low pulse width (SPIDIV + 1) × t tSH SCLOCK high pulse width (SPIDIV + 1) × t t

Data output valid after SCLOCK edge 40 ns

DAV

Data input setup time before SCLOCK edge1 1 × t

DSU

Data input hold time after SCLOCK edge1 2 × t

DHD

tDF Data output fall time 30 40 ns tDR Data output rise time 30 40 ns tSR SCLOCK rise time 1 ns tSF SCLOCK fall time 1 ns t

DOCS

SFS

= 97.6 ns. It corresponds to the 10.24 MHz internal clock from the PLL.

UCLK

Data output valid after CS

high after SCLOCK edge

edge

SCLOCK

(POLARITY = 0)

SCLOCK

(POLARITY = 1)

DAV

MISO

DOCS

MSB BITS 6 TO 1 LSB

(2 × t

) + (2 × t

HCLK

UCLK

) ns

UCLK

HCLK

10 ns 0 ns

SFS

MOSI

MSB IN BIT S 6 TO 1 LSB IN

DSU

DHD

07079-033

Figure 6. SPI Slave Mode Timing (Phase Mode = 0)

Rev. C | Page 13 of 108

Page 14

ADuC7060/ADuC7061

ABSOLUTE MAXIMUM RATINGS

TA = −40°C to +125°C, unless otherwise noted.

Table 7.

Parameter Rating

AGND to DGND to AVDD to DVDD −0.3 V to +0.3 V Digital I/O Voltage to DGND −0.3 V to +3.3 V VREF± to AGND −0.3 V to AVDD + 0.3 V ADC Inputs to AGND −0.3 V to AVDD + 0.3 V ESD (Human Body Model) Rating

All Pins ±2 kV Storage Temperature 125°C Junction Temperature

Transient 150°C

Continuous 130°C Lead Temperature

Soldering Reflow (15 sec) 260°C

Stresses above those listed under Absolute Maximum Ratings may cause permanent damage to the device. This is a stress rating only; functional operation of the device at these or any other conditions above those indicated in the operational section of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.

ESD CAUTION

Rev. C | Page 14 of 108

Page 15

ADuC7060/ADuC7061

PIN CONFIGURATIONS AND FUNCTION DESCRIPTIONS

TRST/BM

TCK

TDI

TDO

DVDD

DGND

P2.1/IRQ3/PWM5

P1.6/PWM4

P1.5/PWM3

P1.4/PWM2

P2.0/IRQ2/PWM0/EXTCLKP0.4/IRQ0/PWM1

XTALI

XTALO

P0.3/MOSI/SDA

34 33

P0.2/MISO P0.1/SCLK/SCL

P0.0/SS

31 30

DVDD

DGND

ADC9

ADC8

27 26

ADC7

ADC6

RESET

TMS

P1.0/IRQ1/SIN/T0

P1.1/SOUT

P1.2/SYNC

P1.3/TRIP

P0.5/CTS

P0.6/RTS

DVDD

DGND

DAC0

ADC5/EXT_REF2IN−

4847464544434241403938

1 2

3 4

6 7

8 9

10 11

PIN 1 INDICAT OR

ADuC7060

TOP VIEW

(Not to Scale)

1314151617181920212223

ADC3

ADC2

NOTES

1. THE LFCSP_VQ ONLY HAS AN EXPOSED PADDLE THAT MUST BE LEFT UNCONNECTED. THIS DOES NOT APPLY TO THE LQFP.

ADC4/EXT_REF 2IN+

ADC1

IEXC1

ADC0

IEXC0

GND_SW

AVDD

AGND

VREF+

VREF−

07079-002

Figure 7. 48-Lead LQFP and 48-Lead LFCSP_VQ Pin Configuration

Table 8. ADuC7060 Pin Function Descriptions

Pin No.

Mnemonic Type

0 EP

Description

Exposed Paddle. The LFCSP_VQ only has an exposed paddle that must be left unconnected. This does not apply to the LQFP.

RESET

2 TMS I

I Reset. Input pin, active low. An external 1 kΩ pull-up resistor is recommended with this pin.

JTAG Test Mode Select. Input pin used for debug and download. An external pull-up resistor (~100 kΩ) should be added to this pin.

3 P1.0/IRQ1/SIN/T0 I/O

General-Purpose Input and General Purpose Output P1.0/External Interrupt Request 1/Serial Input/Timer0 Input. This is a multifunction input/output pin offering four functions.

4 P1.1/SOUT I/O

General-Purpose Input and General-Purpose Output P1.1/Serial Output. This is a dual function input/output pin.

5 P1.2/SYNC I/O

General-Purpose Input and General-Purpose Output P1.2/PWM External Sync Input. This is a dual function input/output pin.

6 P1.3/TRIP I/O

General-Purpose Input and General-Purpose Output P1.3/PWM External Trip Input. This is a

dual function input/output pin. 7 P0.5/CTS I/O General-Purpose Input and General-Purpose Output P0.5/Clear-to-Send Signal in UART Mode. 8 P0.6/RTS I/O General-Purpose Input and General-Purpose Output P0.6/Request-to-Send Signal in UART Mode. 9 DVDD S Digital Supply Pin. 10 DGND S Digital Ground. 11 DAC0 O DAC Output. Analog output pin.

Rev. C | Page 15 of 108

Page 16

ADuC7060/ADuC7061

Pin No. Mnemonic Type

12 ADC5/EXT_REF2IN− I

13 ADC4/EXT_REF2IN+ I

14 ADC3 I Single-Ended or Differential Analog Input 3. Analog input for the primary and auxiliary ADCs. 15 ADC2 I Single-Ended or Differential Analog Input 2. Analog input for the primary and auxiliary ADCs. 16 IEXC1 O Programmable Current Source. Analog output pin. 17 IEXC0 O Programmable Current Source. Analog output pin. 18 GND_SW I

19 ADC1 I

20 ADC0 I

21 VREF+ I External Reference Positive Input for the Primary Channel. Analog input pin. 22 VREF− I External Reference Negative Input for the Primary Channel. Analog input pin. 23 AGND S Analog Ground. 24 AVDD S Analog Supply Pin. 25 ADC6 I Analog Input 6 for Auxiliary ADC. Single-ended or differential Analog Input 6. 26 ADC7 I Analog Input 7 for Auxiliary ADC. Single-ended or differential Analog Input 7. 27 ADC8 I Analog Input 8 for Auxiliary ADC. Single-ended or differential Analog Input 8. 28 ADC9 I Analog Input 9 for Auxiliary ADC. Single-ended or differential Analog Input 9. 29 DGND S Digital Ground. 30 DVDD S Digital Supply Pin. 31

P0.0/SS

32 P0.1/SCLK/SCL I/O

33 P0.2/MISO I/O

34 P0.3/MOSI/SDA I/O

35 XTALO O External Crystal Oscillator Output Pin. 36 XTALI I External Crystal Oscillator Input Pin. 37 P0.4/IRQ0/PWM1 I/O

38 P2.0/IRQ2/PWM0/EXTCLK I/O

39 P1.4/PWM2 I/O

40 P1.5/PWM3 I/O

41 P1.6/PWM4 I/O

42 P2.1/IRQ3/PWM5 I/O

Description

Single-Ended or Differential Analog Input 5/External Reference Negative Input. This is a dual function analog input pin. ADC5 serves as the analog input for the auxiliary ADC. EXT_REF2IN− serves as the external reference negative input by ADC for the auxiliary channel.

Multifunction Analog Input Pin. This pin can be used for the single-ended or differential Analog Input 4, which is the analog input for the auxiliary ADC, or it can be used for the external reference positive input for the auxiliary channel.

Switch to Internal Analog Ground Reference. When this input pin is not used, connect it directly to the AGND system ground.

Single-Ended or Differential Analog Input 1. Analog input for the primary ADC. Negative differential input for primary ADC.

Single-Ended or Differential Analog Input 0. Analog input for the primary ADC. Positive differential input for primary ADC.

I/O

General-Purpose Input and General-Purpose Output P0.0/SPI Slave Select Pin (Active Low). This is a dual function input/output pin.

General-Purpose Input and General-Purpose Output P0.1/SPI Clock Pin/I triple function input/output pin.

General-Purpose Input and General-Purpose Output P0.2/SPI Master Input Slave Output. This is a dual function input/output pin.

General-Purpose Input and General-Purpose Output P0.3/SPI Master Output Slave Input/I Data Pin. This is a triple function input/output pin.

General-Purpose Input and General-Purpose Output P0.4/External Interrupt Request 0/PWM1 Output. This is a triple function input/output pin.

General-Purpose Input and General-Purpose Output P2.0/External Interrupt Request 2/PWM0 Output/External Clock Input. This is a multifunction input/output pin.

General-Purpose Input and General-Purpose Output P1.4/PWM2 Output. This is a dual function input/output pin.

General-Purpose Input and General-Purpose Output P1.5/PWM3 Output. This is a dual function input/output pin.

General-Purpose Input and General-Purpose Output P1.6/PWM4 Output. This is a dual function input/output pin.

General-Purpose Input and General-Purpose Output P2.1/External Interrupt Request 3/PWM5 Output. This is a triple function input/output pin.

C Clock Pin. This is a

Rev. C | Page 16 of 108

Page 17

ADuC7060/ADuC7061

Pin No. Mnemonic Type

43 DGND S Digital Ground. 44 DVDD S Digital Supply Pin. 45

NTRST/BM

46 TDO O JTAG Data Out. Output pin used for debug and download only. 47 TDI I

48 TCK I

I = input, O = output, I/O = input/output, and S = supply.

Description

JTAG Reset/Boot Mode. Input pin used for debug and download only and boot mode (BM). The

ADuC7060 enters serial download mode if BM

high at reset through a 13 kΩ resistor.

JTAG Data In. Input pin used for debug and download only. Add an external pull-up resistor

(~100 kΩ) to this pin.

JTAG Clock Pin. Input pin used for debug and download only. Add an external pull-up resistor

(~100 kΩ) to this pin.

is low at reset and executes code if BM is pulled

Rev. C | Page 17 of 108

Page 18

ADuC7060/ADuC7061

WM0

ST/BM

TCK

TDI

TDO

NTR

DVDD

P0.4/IRQ0/PWM1

DGND

P2.0/IRQ2/P

PIN 1

1RESET

INDICATO R

2TMS 3P1.0/IRQ1/SIN/T0

ADuC7061

4P1.1/SOUT

TOP VIEW

5DAC0

(Not to Scale)

6ADC5/EXT_REF 2IN− 7ADC4/EXT_REF 2IN+ 8ADC3

ADC2

ADC1

IEXC1

IEXC0

NOTES

1. THE 32-LEAD LFCSP _VQ HAS AN EXPOSED PADDLE. T HIS EXPO SED PADDLE MUST BE L EFT UNCONNECTED.

GND_SW

Figure 8. 32-Lead LFCSP Pin Configuration

Table 9. ADuC7061 Pin Function Descriptions

Pin No. Mnemonic Type1 Description

0 EP Exposed Paddle. The 32-lead LFCSP_VQ has an exposed paddle that must be left unconnected. 1

RESET

2 TMS I

I Reset Pin. Input pin, active low. An external 1 kΩ pull-up resistor is recommended with this pin.

JTAG Test Mode Select. Input pin used for debug and download. An external pull-up resistor (~100 kΩ) should be added to this pin.

3 P1.0/IRQ1/SIN/T0 I/O

General-Purpose Input and General-Purpose Output P1.0/External Interrupt Request 1/Serial Input/Timer0 Input. This is a multifunction input/output pin offering four functions.

4 P1.1/SOUT I/O

General-Purpose Input and General-Purpose Output P1.1/Serial Output. This is a dual function

input/output pin. 5 DAC0 O DAC Output. Analog output pin. 6 ADC5/EXT_REF2IN− I

Single-Ended or Differential Analog Input 5/External Reference Negative Input. This is a dual

function analog input pin. The ADC5 serves as the analog input for the auxiliary ADC. The

EXT_REF2IN− serves as the external reference negative input by ADC for the auxiliary channel. 7 ADC4/EXT_REF2IN+ I

Multifunction Analog Input Pin. This pin can be used for the single-ended or differential Analog

Input 4, which is the analog input for the auxiliary ADC, or it can be used for the external

reference positive input for the auxiliary channel. 8 ADC3 I Single-Ended or Differential Analog Input 3. Analog input for primary and auxiliary ADCs. 9 ADC2 I Single-Ended or Differential Analog Input 2. Analog input for primary and auxiliary ADCs. 10 IEXC1 O Programmable Current Source. Analog output pin. 11 IEXC0 O Programmable Current Source. Analog output pin. 12 GND_SW I

Switch to Internal Analog Ground Reference. When this input pin is not used, connect it directly

to the AGND system ground. 13 ADC1 I

Single-Ended or Differential Analog Input 1. Analog input for the primary ADC. Negative differential

input for primary ADC. 14 ADC0 I

Single-Ended or Differential Analog Input 0. Analog input for the primary ADC. Positive differential

input for primary ADC. 15 AGND S Analog Ground. 16 AVDD S Analog Supply Pin. 17 VREF+ I External Reference Positive Input for the Primary Channel. Analog input pin. 18 VREF− I External Reference Negative Input for the Primary Channel. Analog input pin. 19

P0.0/SS

/ADC6

I/O

General-Purpose Input and General-Purpose Output P0.0/SPI Slave Select (Active Low)/Input to

Auxiliary ADC6. This is a multifunction input/output pin. Single-ended or differential Analog

Input 6. Analog input for the auxiliary ADC. 20 P0.1/SCLK/SCL/ADC7 I/O

General-Purpose Input and General-Purpose Output P0.1/SPI Clock/I

ADC7. This is a multifunction input/output pin. Single-ended or differential Analog Input 7.

Analog input for the auxiliary ADC.

24 XTALI 23 XTALO 22 P0.3/MOSI/SDA/ADC9 21 P0.2/MISO/ADC8 20 P0.1/SCLK/SCL/ADC7 19 P0.0/SS/ADC6 18 VREF– 17 VREF+

ADC0

AVD

AGND

07079-003

C Clock/Input to Auxiliary

Rev. C | Page 18 of 108

Page 19

ADuC7060/ADuC7061

Pin No. Mnemonic Type1 Description

21 P0.2/MISO/ADC8 I/O

22 P0.3/MOSI/SDA/ADC9 I/O

23 XTALO O External Crystal Oscillator Output Pin. 24 XTALI I External Crystal Oscillator Input Pin. 25 P0.4/IRQ0/PWM1 I/O

26 P2.0/IRQ2/PWM0 I/O

27 DGND S Digital Ground. 28 DVDD S Digital Supply Pin. 29

NTRST/BM

30 TDO O JTAG Data Out. Output pin used for debug and download only. 31 TDI I

32 TCK I

I = input, O = output, I/O = input/output, and S = supply.

General-Purpose Input and General-Purpose Output P0.2/SPI Master Input Slave Output/Auxiliary ADC8 Input. This is a triple function input/output pin. Single-ended or differential Analog Input 8. Analog input for the auxiliary ADC.

General-Purpose Input and General-Purpose Output P0.3/SPI Master Output Slave Input/I

C Data Pin/Auxiliary ADC9 Input. This is a multifunction input/output pin. Single-ended or differential Analog Input 9. Analog input for the auxiliary ADC.

General-Purpose Input and General-Purpose Output P0.4/External Interrupt Request 0/PWM1 Output. This is a triple function input/output pin.

General-Purpose Input and General-Purpose Output P2.0/External Interrupt Request 2/PWM0 Output. This is a triple function input/output pin.

JTAG Reset/Boot Mode. Input pin used for debug and download only and boot mode (BM). The ADuC7061 enters serial download mode if BM

is low at reset and executes code if BM is pulled

high at reset through a 13 kΩ resistor.

JTAG Data In. Input pin used for debug and download only. Add an external pull-up resistor (~100 kΩ) to this pin.

JTAG Clock. Input pin used for debug and download only. Add an external pull-up resistor (~100 kΩ) to this pin.

Rev. C | Page 19 of 108

Page 20

ADuC7060/ADuC7061

TERMINOLOGY

Conversion Rate

The conversion rate specifies the rate at which an output result is available from the ADC, when the ADC has settled.

The sigma-delta (Σ-) conversion techniques used on this part mean that whereas the ADC front-end signal is oversampled at a relatively high sample rate, a subsequent digital filter is used to decimate the output, giving a valid 24-bit data conversion result at output rates from 1 Hz to 8 kHz.

Note that, when software switches from one input to another (on the same ADC), the digital filter must first be cleared and then allowed to average a new result. Depending on the configuration of the ADC and the type of filter, this can take multiple conversion cycles.

Integral Nonlinearity (INL)

INL is the maximum deviation of any code from a straight line passing through the endpoints of the transfer function. The endpoints of the transfer function are zero scale, a point ½ LSB below the first code transition, and full scale, a point ½ LSB above the last code transition (111 . . . 110 to 111 . . . 111). The error is expressed as a percentage of full scale.

No Missing Codes

No missing codes is a measure of the differential nonlinearity of the ADC. The error is expressed in bits and specifies the number of codes (ADC results) as 2N bits, where N is no missing codes guaranteed to occur through the full ADC input range.

Offset Error

Offset error is the deviation of the first code transition ADC input voltage from the ideal first code transition.

Offset Error Drift

Offset error drift is the variation in absolute offset error with respect to temperature. This error is expressed as least significant bits per degree Celsius.

Gain Error

Gain error is a measure of the span error of the ADC. It is a measure of the difference between the measured and the ideal span between any two points in the transfer function.

Output Noise

The output noise is specified as the standard deviation (or 1 × Sigma) of the distribution of the ADC output codes collected when the ADC input voltage is at a dc voltage. It is expressed as micro root mean square. The output, or root mean square (rms) noise, can be used to calculate the effective resolution of the ADC as defined by the following equation:

Effective Resolution = log2(Full-Scale Range/rms Noise) bits

The peak-to-peak noise is defined as the deviation of codes that fall within 6.6 × Sigma of the distribution of ADC output codes collected when the ADC input voltage is at dc. The peak-to-peak noise is, therefore, calculated as

6.6 × rms Noise

The peak-to-peak noise can be used to calculate the ADC (noise free code) resolution for which there is no code flicker within a 6.6-Sigma limit as defined by the following equation:

Noise Free Code Resolution = log2

Data Sheet Acronyms

ADC analog-to-digital converter ARM advanced RISC machine JTAG joint test action group LSB least significant byte/bit LVF low voltage flag MCU microcontroller MMR memory mapped register MSB most significant byte/bit PID protected identifier POR power-on reset PSM power supply monitor rms root mean square

⎛ ⎜

⎜ ⎝

−

RangeScaleFull

−−

⎞ ⎟

bits

⎟

NoisePeaktoPeak

⎠

Rev. C | Page 20 of 108

Page 21

ADuC7060/ADuC7061

OVERVIEW OF THE ARM7TDMI CORE

The ARM7® core is a 32-bit, reduced instruction set computer (RISC), developed by ARM® Ltd. The ARM7TDMI is a von Neumann-based architecture, meaning that it uses a single 32-bit bus for instruction and data. The length of the data can be 8, 16, or 32 bits, and the length of the instruction word is either 16 bits or 32 bits, depending on the mode in which the core is operating.

The ARM7TDMI is an ARM7 core with four additional features, as listed in Tabl e 10 .

Table 10. ARM7TDMI Features

Feature Description

T Support for the Thumb® (16-bit) instruction set D Support for debug M Enhanced multiplier I

Includes the EmbeddedICE® module to support embedded system debugging

THUMB MODE (T)

An ARM instruction is 32 bits long. The ARM7TDMI processor supports a second instruction set compressed into 16 bits, the Thumb instruction set. Faster code execution from 16-bit memory and greater code density is achieved by using the Thumb instruction set, making the ARM7TDMI core particularly suited for embedded applications.

However, the Thumb mode has three limitations.

• Relative to ARM, the Thumb code usually requires more

instructions to perform the same task. Therefore, ARM code is best for maximizing the performance of timecritical code in most applications.

• The Thumb instruction set does not include some

instructions that are needed for exception handling, so ARM code can be required for exception handling.

• When an interrupt occurs, the core vectors to the interrupt

location in memory and executes the code present at that address. The first command is required to be in ARM code.

MULTIPLIER (M)

The ARM7TDMI instruction set includes an enhanced multiplier, with four extra instructions to perform 32-bit by 32-bit multiplication with a 64-bit result, and 32-bit by 32-bit multiplication-accumulation (MAC) with a 64-bit result.

EmbeddedICE (I)

The EmbeddedICE module provides integrated on-chip debug support for the ARM7TDMI. The EmbeddedICE module contains the breakpoint and watchpoint registers that allow nonintrusive user code debugging. These registers are controlled through the JTAG test port. When a breakpoint or watchpoint is encountered, the processor halts and enters the debug state. When in a debug state, the processor registers can be interrogated, as can the Flash/EE, SRAM, and memory mapped registers.

Rev. C | Page 21 of 108

ARM7 Exceptions

The ARM7 supports five types of exceptions, with a privileged processing mode associated with each type. The five types of exceptions are as follows:

Type 1: normal interrupt or IRQ. This is provided to service general-purpose interrupt handling of internal and external events. Note that the ADuC706x supports eight configurable priority levels for all IRQ sources.

Type 2: fast interrupt or FIQ. This is provided to service data transfer or a communication channel with low latency. FIQ has priority over IRQ. Note that the ADuC706x supports eight configurable priority levels for all FIQ sources.

Type 3: memory abort (prefetch and data).

Type 4: attempted execution of an undefined instruction.

Type 5: software interrupts (SWI) instruction that can be used to make a call to an operating system.

Typically, the programmer defines interrupts as IRQ, but for higher priority interrupts, the programmer can define interrupts as the FIQ type.

The priority of these exceptions and vector addresses are listed in Tabl e 1 1 .

Table 11. Exception Priorities and Vector Addresses

Priority Exception Address

1 Hardware reset 0x00 2 Memory abort (data) 0x10 3 FIQ 0x1C 4 IRQ 0x18 5 Memory abort (prefetch) 0x0C 6 Software interrupt1 0x08 6 Undefined instruction1 0x04

A software interrupt and an undefined instruction exception have the same

priority and are mutually exclusive.

The exceptions listed in Table 1 1 are located from 0x00 to 0x1C, with a reserved location at 0x14.

ARM REGISTERS

The ARM7TDMI has 16 standard registers. R0 to R12 are for data manipulation, R13 is the stack pointer, R14 is the link register, and R15 is the program counter that indicates the instruction currently being executed. The link register contains the address from which the user has branched (when using the branch and link command) or the command during which an exception occurred.

The stack pointer contains the current location of the stack. Generally, on an ARM7TDMI, the stack starts at the top of the available RAM area and descends using the area as required. A separate stack is defined for each of the exceptions. The size of each stack is user configurable and is dependent on the target application. When programming using high level languages,

Page 22

ADuC7060/ADuC7061

such as C, it is necessary to ensure that the stack does not overflow. This is dependent on the performance of the compiler that is used.

When an exception occurs, some of the standard registers are replaced with registers specific to the exception mode. All exception modes have replacement banked registers for the stack pointer (R13) and the link register (R14) as represented in Figure 9. The FIQ mode has more registers (R8 to R12) supporting faster interrupt processing. With the increased number of noncritical registers, the interrupt can be processed without the need to save or restore these registers, thereby reducing the response time of the interrupt handling process.

More information relative to the programmer’s model and the ARM7TDMI core architecture can be found in ARM7TDMI technical and ARM architecture manuals available directly from ARM Ltd.

R10

R11

R12

R13

R14

R15 (PC)

CPSR

USER MODE

R8_FIQ

R9_FIQ

R10_FIQ

R11_FIQ

R12_FIQ

R13_FIQ

R14_FIQ

SPSR_FIQ

FIQ

MODE

R13_SVC

R14_SVC

SPSR_SVC

SVC

MODE

SPSR_ABT

Figure 9. Register Organization

INTERRUPT LATENCY

The worst-case latency for an FIQ consists of the longest time that the request can take to pass through the synchronizer, plus the time for the longest instruction to complete (the longest instruction is an LDM) that loads all the registers including the PC, plus the time for the data abort entry, plus the time for FIQ entry. At the end of this time, the ARM7TDMI is executing the instruction at 0x1C (FIQ interrupt vector address). The maximum total time is 50 processor cycles, or just over 4.88 s in a system using a continuous 10.24 MHz processor clock. The maximum IRQ latency calculation is similar but must allow for the FIQ having higher priority, which can delay entry into the IRQ handling routine for an arbitrary length of time. This time can be reduced to 42 cycles if the LDM command is not used; some compilers have an option to compile without using this command. Another option is to run the part in Thumb mode where this time is reduced to 22 cycles.

The minimum latency for FIQ or IRQ interrupts is five cycles. This consists of the shortest time that the request can take through the synchronizer plus the time to enter the exception mode.

USABLE IN USER MODE

SYSTEM MODES ONLY

R13_ABT

R14_ABT

ABORT

MODE

R13_IRQ

R14_IRQ

SPSR_IRQ

IRQ

MODE

R13_UND

R14_UND

SPSR_UND

UNDEFINED

MODE

Rev. C | Page 22 of 108

Note that the ARM7TDMI initially (first instruction) runs in ARM (32-bit) mode when an exception occurs. The user can immediately switch from ARM mode to Thumb mode if required, for example, when executing interrupt service routines.

MEMORY ORGANIZATION

The ARM7, a von Neumann architecture MCU core, sees memory as a linear array of 232-byte locations. As shown in Figure 10, the ADuC706x maps this into four distinct user areas: a memory area that can be remapped, an SRAM area, a Flash/EE area, and a memory mapped register (MMR) area.

The first 30 kB of this memory space is used as an area into which the on-chip Flash/EE or SRAM can be remapped. Any access, either reading or writing, to an area not defined in the memory map results in a data abort exception.

Memory Format

The ADuC706x memory organization is configured in little endian format: the least significant byte is located in the lowest byte address and the most significant byte in the highest byte address (see Figure 11).

0xFFFFFFFF

0xFFFF0000

0x00087FFF

0x00080000

0x00040FFF

0x00040000

0x00007FFF

07079-004

0x00000000

BIT 31

BYTE 3

BYTE 2

. . .

Figure 11. Little Endian Format

SRAM

The ADuC706x features 4 kB of SRAM, organized as 1024 × 32 bits, that is, 1024 words located at 0x40000. The RAM space can be used as data memory as well as volatile program space.

ARM code can run directly from SRAM at full clock speed given that the SRAM array is configured as a 32-bit wide memory array. SRAM is read/writable in 8-, 16-, and 32-bit segments.

Remap

The ARM exception vectors are all situated at the bottom of the memory array, from Address 0x00000000 to Address 0x00000020.

MMRs

RESERVED

FLASH/EE

RESERVED

SRAM

RESERVED

REMAPPABLE MEMORY SPACE (FLASH/EE OR SRAM)

Figure 10. Memory Map

BYTE 1

. . .

32 BITS

BYTE 0

BIT 0

0xFFFFFFFF

0x00000004

0x00000000

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By default, after a reset, the Flash/EE memory is logically mapped to Address 0x00000000. It is possible to logically remap the SRAM to Address 0x00000000 by setting Bit 0 of the remap MMR located at 0xFFFF0220. To revert Flash/EE to 0x00000000, Bit 0 of remap is cleared.

It is sometimes desirable to remap RAM to 0x00000000 to optimize the interrupt latency of the ADuC706x because code can run in full 32-bit ARM mode and at maximum core speed. Note that, when an exception occurs, the core defaults to ARM mode.

Remap Operation

When a reset occurs on the ADuC706x, execution starts automatically in the factory programmed internal configuration code. This so-called kernel is hidden and cannot be accessed by user code. If the ADuC706x is in normal mode, it executes the poweron configuration routine of the kernel and then jumps to the reset vector, Address 0x00000000, to execute the user’s reset exception routine. Because the Flash/EE is mirrored at the bottom of the memory array at reset, the reset routine must always be written in Flash/EE.

The remap command must be executed from the absolute Flash/EE address and not from the mirrored, remapped segment of memory, because this may be replaced by SRAM. If a remap operation is executed while operating code from the mirrored location, prefetch/data aborts can occur, or the user can observe abnormal program operation. Any kind of reset logically remaps the Flash/EE memory to the bottom of the memory array.

Remap Register

Name: Remap

Address: 0xFFFF0220

Default value: 0x0000

Access: Read and write

Function: This 8-bit register allows user code to remap

either RAM or Flash/EE space into the bottom of the ARM memory space starting at Address 0x00000000.

Table 12. Remap MMR Bit Designations

Bit Description

7:1

0 Remap bit. Set by user to remap the SRAM to 0x00000000.

Reserved. These bits are reserved and should be written as 0 by user code.

Cleared automatically after reset to remap the Flash/EE memory to 0x00000000.

FLASH/EE CONTROL INTERFACE

Serial and JTAG programming use the Flash/EE control interface, which includes the eight MMRs outlined in this section. Note that the flash page size is 512 bytes.

FEESTA Register

FEESTA is a read-only register that reflects the status of the flash control interface as described in Tab l e 13 .

Name: FEESTA

Address: 0xFFFF0E00

Default value: 0x0020

Access: Read

Table 13. FEESTA MMR Bit Designations

Bit Description

15:6 Reserved. 5 Reserved. 4 Reserved. 3

Flash interrupt status bit. Set automatically when an interrupt occurs, that is, when a command is complete and the Flash/EE interrupt enable bit in the FEEMOD register is set. Cleared when reading the FEESTA register.

Flash/EE controller busy. Set automatically when the controller is busy. Cleared automatically when the controller is not busy.

Command fail. Set automatically when a command completes unsuccessfully. Cleared automatically when reading the FEESTA register.

Command pass. Set by the MicroConverter® when a command completes successfully. Cleared automatically when reading the FEESTA register.

FEEMOD Register

FEEMOD sets the operating mode of the flash control interface. Tabl e 14 lists FEEMOD MMR bit designations.

Name: FEEMOD

Address: 0xFFFF0E04

Default value: 0x0000

Access: Read and write

Table 14. FEEMOD MMR Bit Designations

Bit Description

15:9 Reserved. 8 Reserved. Always set this bit to 1. 7:5

4 Flash/EE interrupt enable.

Cleared by user to disable the Flash/EE interrupt. 3 Erase/write command protection. Set by user to enable the erase and write commands.

2:0 Reserved. Always set these bits to 0.

Reserved. Always set these bits to 0 except when writing keys.

Set by user to enable the Flash/EE interrupt. The interrupt occurs when a command is complete.

Cleared to protect the Flash/EE against the erase/write command.

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FEECON Register

FEECON is an 8-bit command register. The commands are described in Ta bl e 15 .

Table 15. Command Codes in FEECON

Code Command Description

0x001 Null Idle state. 0x011 Single read Load FEEDAT with the 16-bit data. Indexed by FEEADR. 0x021 Single write Write FEEDAT at the address pointed to by FEEADR. This operation takes 50 s. 0x031 Erase/write

0x041 Single verify

0x051 Single erase Erase the page indexed by FEEADR. 0x061 Mass erase

0x07 Reserved Reserved. 0x08 Reserved Reserved. 0x09 Reserved Reserved. 0x0A Reserved Reserved. 0x0B Signature

0x0C Protect

0x0D Reserved Reserved. 0x0E Reserved Reserved. 0x0F Ping No operation; interrupt generated.

The FEECON register always reads 0x07 immediately after execution of any of these commands.

Erase the page indexed by FEEADR and write FEEDAT at the location pointed to by FEEADR. This operation takes approximately 24 ms.

Compare the contents of the location pointed to by FEEADR to the data in FEEDAT. The result of the comparison is returned in FEESTA Bit 0 and Bit 1.

Erase 30 kB of user space. The 2 kB of kernel are protected. To prevent accidental execution, a command sequence is required to execute this instruction. See the Command Sequence for Executing a Mass Erase section.

This command results in a 24-bit LFSR-based signature being generated and loaded into the FEESIGN MMR. This operation takes 16,389 clock cycles.

This command can run only once. The value of FEEPRO is saved and is removed only with a mass erase (0x06) or the key.

Name: FEECON

Address: 0xFFFF0E08

Default value: 0x07

Access: Read and write

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FEEDAT Register

FEEDAT is a 16-bit data register. This register holds the data value for flash read and write commands.

Name: FEEDAT

Address: 0xFFFF0E0C

Default value: 0xXXXX

Access: Read and write

FEEHIDE Register

The FEEHIDE MMR provides immediate protection. It does not require any software key. Note that the protection settings in FEEHIDE are cleared by a reset (see Table 16).

Name: FEEHIDE

Address: 0xFFFF0E20

Default value: 0xFFFFFFFF

Access: Read and write

FEEADR Register

FEEADR is a 16-bit address register used for accessing individual pages of the 32 kB flash block. The valid address range for a user is: 0x0000 to 0x77FF. This represents the 30 kB flash user memory space. A read or write access outside this boundary causes a data abort exception to occur.

Name: FEEADR

Address: 0xFFFF0E10

Default value: 0x0000

Access: Read and write

FEESIGN Register

The FEESIGN register is a 24-bit MMR. This register is updated with the 24-bit signature value after the signature command is executed. This value is the result of the linear feedback shift register (LFSR) operation initiated by the signature command.

Name: FEESIGN

Address: 0xFFFF0E18

Default value: 0xFFFFFF

Access: Read

FEEPRO Register

The FEEPRO MMR provides protection following a subsequent reset of the MMR. It requires a software key (see Tab l e 1 6 ).

Name: FEEPRO

Address: 0xFFFF0E1C

Default value: 0x00000000

Access: Read and write

Table 16. FEEPRO and FEEHIDE MMR Bit Designations

Bit Description

31 Read protection.

Cleared by user to protect all code. No JTAG read accesses for protected pages if this bit is cleared. Set by the user to allow reading the code via JTAG.

28:0

Protection for Page 59 (0x00087600 to 0x000877FF). Set by the user to allow writing to Page 59. Cleared to protect Page 59.

Protection for Page 58 (0x00087400 to 0x000875FF). Set by the user to allow writing to Page 58. Cleared to protect Page 58.

Write protection for Page 57 to Page 0. Each bit represents two pages. Each page is 512 bytes in size. Bit 0 is protection for Page 0 and Page 1 (0x00080000 to 0x000803FF). Set by the user to allow writing Page 0 and Page 1. Cleared to protect Page 0 and Page 1.

Bit 1 is protection for Page 2 and Page 3 (0x00080400 to 0x000807FF. Set by the user to allow writing Page 2 and Page 3. Cleared to protect Page 2 and Page 3. … …

Bit 27 is protection for Page 54 and Page 55 (0x00087000 to 0x000873FF). Set by the user to allow writing to Page 54 and Page 55. Cleared to protect Page 54 and Page 55.

Bit 28 is protection for Page 56 and Page 57 (0x00087400 to 0x000877FF). Set by the user to allow writing to Page 56 and Page 57. Cleared to protect Page 56 and Page 57.

Temporary Protection

Temporary protection can be set and removed by writing directly into the FEEHID MMR. This register is volatile and, therefore, protection is only in place for as long as the part remains powered on. The protection setting is not reloaded after a power cycle.

Keyed Permanent Protection

Keyed permanent protection can be set via FEEPRO to lock the protection configuration. The software key used at the start of the required FEEPRO write sequence is saved one time only and must be used for any subsequent access of the FEEHID or FEEPRO MMRs. A mass erase sets the software protection key back to 0xFFFF but also erases the entire user code space.

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Permanent Protection

Permanent protection can be set via FEEPRO, similar to how keyed permanent protection is set, with the only difference being that the software key used is 0xDEADDEAD. When the FEEPRO write sequence is saved, only a mass erase sets the software protection key back to 0xFFFFFFFF. This also erases the entire user code space.

Sequence to Write the Software Protection Key and Set Permanent Protection

1. Write in FEEPRO corresponding to the pages to be

protected.

2. Write the new (user-defined) 32-bit software protection

key in FEEADR (Bits[31:16]) and FEEDAT (Bits[15:0]).

3. Write 10 in FEEMOD (Bits[6:5]) and set FEEMOD (Bit 3).

4. Run the protect command (Code 0x0C) in FEECON.

To remove or modify the protection, the same sequence can be used with a modified value of FEEPRO.

The previous sequence for writing the key and setting permanent protection is illustrated in the following example, this protects writing Page 4 and Page 5 of the Flash/EE:

Int a = FEESTA; // Ensure FEESTA is cleared FEEPRO = 0xFFFFFFFB; // Protect Page 4 and Page 5 FEEADR = 0x66BB; // 32-bit key value (Bits[31:16]) FEEDAT = 0xAA55; // 32-bit key value (Bits[15:0]) FEEMOD = 0x0048 // Lock security sequence FEECON = 0x0C; // Write key command while (FEESTA & 0x04){} // Wait for command to finish

Command Sequence for Executing a Mass Erase

FEEDAT = 0x3CFF; FEEADR = 0x77C3; FEEMOD = FEEMOD|0x8; //Erase key enable FEECON = 0x06; //Mass erase command

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MEMORY MAPPED REGISTERS

The memory mapped register (MMR) space is mapped into the upper two pages of the memory array and is accessed by indirect addressing through the ARM7 banked registers.

The MMR space provides an interface between the CPU and all on-chip peripherals. All registers, except the core registers, reside in the MMR area. All shaded locations shown in Figure 12 are unoccupied or reserved locations and should not be accessed by user software. Figure 12 shows the full MMR memory map.

The access time for reading from or writing to an MMR depends on the advanced microcontroller bus architecture (AMBA) bus used to access the peripheral. The processor has two AMBA buses: the advanced high performance bus (AHB) used for system modules and the advanced peripheral bus (APB) used for a lower performance peripheral. Access to the AHB is one cycle, and access to the APB is two cycles. All peripherals on the ADuC706x are on the APB except for the Flash/EE memory, the GPIOs, and the PWM.

0xFFFFFFF

0xFFFF0FC0

0xFFFF0F80

0xFFFF0E24

0xFFFF0E00

0xFFFF0D50

0xFFFF0D00

0xFFFF0A14

0xFFFF0A00

0xFFFF 0948

0xFFFF 0900

0xFFFF 0730

0xFFFF 0700

0xFFFF 0620

0xFFFF 0600

0xFFFF 0570

0xFFFF 0500

0xFFFF 0490

0xFFFF 048C

0xFFFF 0470

0xFFFF 0450

0xFFFF 0420

0xFFFF 0404

0xFFFF 0394

0xFFFF 0380

0xFFFF 0370

0xFFFF 0360

0xFFFF 0350

0xFFFF 0340

0xFFFF 0334

0xFFFF 0320

0xFFFF 0238

0xFFFF 0220

0xFFFF 0140

0xFFFF 0000

PWM

FLASH CONTRO L

INTERFACE

GPIO

SPI

I2C

UART

DAC

ADC

BAND GAP

REFERENCE

SPI/I2C

SELECTION

PLL AND OSCI LLATOR

CONTROL

GENERAL-PURPO SE

TIMER

WATCHDOG

TIMER

WAKE-UP

TIMER

GENERAL-PURPO SE

TIMER

REMAP AND

SYSTEM CONTROL

INTERRUPT

CONTROLL ER

Figure 12. Memory Mapped Registers

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COMPLETE MMR LISTING

In the following MMR tables, addresses are listed in hexadecimal code. Access types include R for read, W for write, and R/W for read and write.

Table 17. IRQ Address Base = 0xFFFF0000

Access

Address Name Bytes

0x0000 IRQSTA 4 R 0x00000000 Active IRQ source status. 0x0004 IRQSIG 4 R Current state of all IRQ sources (enabled and disabled). 0x0008 IRQEN 4 R/W 0x00000000 Enabled IRQ sources. 0x000C IRQCLR 4 W 0x00000000 MMR to disable IRQ sources. 0x0010 SWICFG 4 W 0x00000000 Software interrupt configuration MMR. 0x0014 IRQBASE 4 R/W 0x00000000

0x001C IRQVEC 4 R 0x00000000

0x0020 IRQP0 4 R/W 0x00000000

0x0024 IRQP1 4 R/W 0x00000000

0x0028 IRQP2 4 R/W 0x00000000

0x0030 IRQCONN 4 R/W 0x00000000 Used to enable IRQ and FIQ interrupt nesting. 0x0034 IRQCONE 4 R/W 0x00000000

0x0038 IRQCLRE 4 R/W 0x00000000 Used to clear an edge-level-triggered interrupt source. 0x003C IRQSTAN 4 R/W 0x00000000

0x0100 FIQSTA 4 R 0x00000000 Active FIQ source status. 0x0104 FIQSIG 4 R Current state of all FIQ sources (enabled and disabled). 0x0108 FIQEN 4 R/W 0x00000000 Enabled FIQ sources. 0x010C FIQCLR 4 W 0x00000000 MMR to disable FIQ sources. 0x011C FIQVEC 4 R 0x00000000

0x013C FIQSTAN 4 R/W 0x00000000

Typ e

Default Value Description

Base address of all vectors. Points to the start of the 64-byte memory block, which can contain up to 32 pointers to separate subroutine handlers.

This register contains the subroutine address for the currently active IRQ source.

Contains the interrupt priority setting for Interrupt Source 1 to Interrupt Source 7. An interrupt can have a priority setting of 0 to 7.

Contains the interrupt priority setting for Interrupt Source 8 to Interrupt Source 15.

Contains the interrupt priority setting for Interrupt Source 16 to Interrupt Source 19.

Configures the external interrupt sources as rising edge, falling edge, or level triggered.

This register indicates the priority level of an interrupt that has just caused an interrupt exception.

This register contains the subroutine address for the currently active FIQ source.

Indicates the priority level of an FIQ that has just caused an FIQ exception.

Table 18. System Control Address Base = 0xFFFF0200

Access

Address Name Bytes

0x0220 REMAP1 1 R/W 0x00 Remap control register. See the Remap Operation section. 0x0230 RSTSTA 1 R/W 0x01 RSTSTA status MMR. See the Reset section. 0x0234 RSTCLR 1 W 0x00 Register for clearing the RSTSTA register.

Updated by the kernel.

Type Default Value Description

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Table 19. Timer Address Base = 0xFFFF0300

Access

Address Name Bytes

0x0320 T0LD 4 R/W 0x00000000 Timer0 load register. 0x0324 T0VAL 4 R 0xFFFFFFFF Timer0 value register. 0x0328 T0CON 4 R/W 0x01000000 Timer0 control MMR. 0x032C T0CLRI 1 W N/A Timer0 interrupt clear register. 0x0330 T0CAP 4 R 0x00000000 Timer0 capture register. 0x0340 T1LD 4 R/W 0x00000000 Timer1 load register. 0x0344 T1VAL 4 R 0xFFFFFFFF Timer1 value register. 0x0348 T1CON 2 R/W 0x0000 Timer1 control MMR. 0x034C T1CLRI 1 W N/A Timer1 interrupt clear register. 0x0360 T2LD 2 R/W 0x0040 Timer2 load register. 0x0364 T2VAL 2 R 0x0040 Timer2 value register. 0x0368 T2CON 2 R/W 0x0000 Timer2 control MMR. 0x036C T2CLRI 1 W N/A Timer2 interrupt clear register. 0x0380 T3LD 2 R/W 0x0000 Timer3 load register. 0x0384 T3VAL 2 R 0xFFFF Timer3 value register. 0x0388 T3CON 4 R/W 0x00000000 Timer3 control MMR. 0x038C T3CLRI 1 W N/A Timer3 interrupt clear register. 0x0390 T3CAP 2 R 0x0000 Timer3 capture register.

Type Default Value Description

Table 20. PLL Base Address = 0xFFFF0400

Access

Address Name Bytes

0x0404 POWKEY1 2 W 0xXXXX POWCON0 prewrite key. 0x0408 POWCON0 1 R/W 0x7B Power control and core speed control register. 0x040C POWKEY2 2 W 0xXXXX POWCON0 postwrite key. 0x0410 PLLKEY1 2 W 0xXXXX PLLCON prewrite key. 0x0414 PLLCON 1 R/W 0x00 PLL clock source selection MMR. 0x0418 PLLKEY2 2 W 0xXXXX PLLCON postwrite key. 0x0434 POWKEY3 2 W 0xXXXX POWCON1 prewrite key. 0x0438 POWCON1 2 R/W 0x124 Power control register. 0x043C POWKEY4 2 W 0xXXXX POWCON1 postwrite key. 0x0464 GP0KEY1 2 W 0xXXXX GP0CON1 prewrite key. 0x0468 GP0CON1 1 R/W 0x00

0x046C GP0KEY2 2 W 0xXXXX GP0CON1 postwrite key.

Type Default Value Description

Configures P0.0, P0.1, P0.2, and P0.3 as analog inputs or digital I/Os. Also enables SPI or I

C mode.

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Table 21. ADC Address Base = 0xFFFF0500

Access

Address Name Bytes

0x0500 ADCSTA 2 R 0x0000 ADC status MMR. 0x0504 ADCMSKI 2 R/W 0x0000 ADC interrupt source enable MMR. 0x0508 ADCMDE 1 R/W 0x03 ADC mode register. 0x050C ADC0CON 2 R/W 0x8000 Primary ADC control MMR. 0x0510 ADC1CON 2 R/W 0x0000 Auxiliary ADC control MMR. 0x0514 ADCFLT 2 R/W 0x0007 ADC filter control MMR. 0x0518 ADCCFG 1 R/W 0x00 ADC configuration MMR. 0x051C ADC0DAT 4 R 0x00000000 Primary ADC result MMR. 0x0520 ADC1DAT 4 R 0x00000000 Auxiliary ADC result MMR 0x0524 ADC0OF1 2 R/W

0x0528 ADC1OF1 2 R/W

0x052C ADC0GN1 2 R/W 0x5555 Primary ADC offset MMR. 0x0530 ADC1GN1 2 R/W 0x5555

0x0534 ADC0RCR 2 R/W 0x0001 Primary ADC result counter/reload MMR. 0x0538 ADC0RCV 2 R 0x0000 Primary ADC result counter MMR. 0x053C ADC0TH 2 R/W 0x0000 Primary ADC 16-bit comparator threshold MMR. 0x0540 ADC0THC 2 R/W 0x0001 Primary ADC 16-bit comparator threshold counter limit. 0x0544 ADC0THV 2 R 0x0000 ADC0 8-bit threshold exceeded counter register 0x0548 ADC0ACC 4 R 0x00000000 Primary ADC accumulator. 0x054C ADC0ATH 4 R/W 0x00000000 Primary ADC 32-bit comparator threshold MMR. 0x0570 IEXCON 1 R/W 0x00 Excitation current sources control register.

Updated by the kernel to part specific calibration value.

Type Default Value Description

0x0000, part specific, factory programmed

Primary ADC offset calibration setting.

Auxiliary ADC offset MMR.

Auxiliary ADC offset MMR. See the ADC operation mode configuration bit (ADCLPMCFG[1:0]) in Tabl e 42.

Table 22. DAC Control Address Base = 0xFFFF0600

Access

Address Name Bytes

0x0600 DAC0CON 2 R/W 0x0200 DAC control register. 0x0604 DAC0DAT 4 R/W 0x00000000 DAC output data register.

Type Default Value Description

Table 23. UART Base Address = 0xFFFF0700

Access

Address Name Bytes

0x0700 COMTX 1 W N/A UART transmit register. 0x0700 COMRX 1 R 0x00 UART receive register. 0x0700 COMDIV0 1 R/W 0x00 UART Standard Baud Rate Generator Divisor Value 0. 0x0704 COMIEN0 1 R/W 0x00 UART Interrupt Enable MMR 0. 0x0704 COMDIV1 1 R/W 0x00 UART Standard Baud Rate Generator Divisor Value 1. 0x0708 COMIID0 1 R 0x01 UART Interrupt Identification 0. 0x070C COMCON0 1 R/W 0x00 UART Control Register 0. 0x0710 COMCON1 1 R/W 0x00 UART Control Register 1. 0x0714 COMSTA0 1 R 0x60 UART Status Register 0. 0x0718 COMSTA1 1 R 0x00 UART Status Register 1. 0X072C COMDIV2 2 R/W 0x0000 UART fractional divider MMR.

Type Default Value Description

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Table 24. I2C Base Address = 0xFFFF0900

Address Name Bytes Access Type Default Value Description

0x0900 I2CMCON 2 R/W 0x0000 I2C master control register. 0x0904 I2CMSTA 2 R 0x0000 I2C master status register. 0x0908 I2CMRX 1 R 0x00 I2C master receive register. 0x090C I2CMTX 1 W 0x00 I2C master transmit register. 0x0910 I2CMCNT0 2 R/W 0x0000

0x0914 I2CMCNT1 1 R 0x00

0x0918 I2CADR0 1 R/W 0x00

0x091C I2CADR1 1 R/W 0x00

0x0924 I2CDIV 2 R/W 0x1F1F I2C clock control register. Used to configure the SCLK frequency. 0x0928 I2CSCON 2 R/W 0x0000 I2C slave control register. 0x092C I2CSSTA 2 R/W 0x0000 I2C slave status register. 0x0930 I2CSRX 1 R 0x00 I2C slave receive register. 0x0934 I2CSTX 1 W 0x00 I2C slave transmit register. 0x0938 I2CALT 1 R/W 0x00 I2C hardware general call recognition register. 0x093C I2CID0 1 R/W 0x00 I2C Slave ID0 register. Slave bus ID register. 0x0940 I2CID1 1 R/W 0x00 I2C Slave ID1 register. Slave bus ID register. 0x0944 I2CID2 1 R/W 0x00 I2C Slave ID2 register. Slave bus ID register. 0x0948 I2CID3 1 R/W 0x00 I2C Slave ID3 register. Slave bus ID register. 0x094C I2CFSTA 2 R/W 0x0000 I2C FIFO status register. Used in both master and slave modes.

C master read count register. Write the number of required bytes into

I this register prior to reading from a slave device.

C master current read count register. This register contains the

I number of bytes already received during a read from slave sequence.

Address byte register. Write the required slave address here prior to communications.

Address byte register. Write the required slave address here prior to communications. Only used in 10-bit mode.

Table 25. SPI Base Address = 0xFFFF0A00

Access

Address Name Bytes

0x0A00 SPISTA 4 R 0x00000000 SPI status MMR. 0x0A04 SPIRX 1 R 0x00 SPI receive MMR. 0x0A08 SPITX 1 W 0x00 SPI transmit MMR. 0x0A0C SPIDIV 1 W 0x1B SPI baud rate select MMR. 0x0A10 SPICON 2 R/W 0x0000 SPI control MMR.

Type Default Value Description

Table 26. GPIO Base Address = 0xFFFF0D00

Access

Address Name Bytes

0x0D00 GP0CON0 4 R/W 0x00000000 GPIO Port 0 control MMR. 0x0D04 GP1CON 4 R/W 0x00000000 GPIO Port 1 control MMR. 0x0D08 GP2CON 4 R/W 0x00000000 GPIO Port 2 control MMR. 0x0D20 GP0DAT 4 R/W 0x000000XX GPIO Port 0 data control MMR. 0x0D24 GP0SET 4 W 0x000000XX GPIO Port 0 data set MMR. 0x0D28 GP0CLR 4 W 0x000000XX GPIO Port 0 data clear MMR. 0x0D2C GP0PAR 4 R/W 0x00000000 GPIO Port 0 pull-up disable MMR. 0x0D30 GP1DAT 4 R/W 0x000000XX GPIO Port 1 data control MMR. 0x0D34 GP1SET 4 W 0x000000XX GPIO Port 1 data set MMR. 0x0D38 GP1CLR 4 W 0x000000XX GPIO Port 1 data clear MMR. 0x0D3C GP1PAR 4 R/W 0x00000000 GPIO Port 1 pull-up disable MMR. 0x0D40 GP2DAT 4 R/W 0x000000XX GPIO Port 2 data control MMR. 0x0D44 GP2SET 4 W 0x000000XX GPIO Port 2 data set MMR. 0x0D48 GP2CLR 4 W 0x000000XX GPIO Port 2 data clear MMR. 0x0D4C GP2PAR 4 R/W 0x00000000 GPIO Port 2 pull-up disable MMR.

Type Default Value Description

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Table 27. Flash/EE Base Address = 0xFFFF0E00

Access

Address Name Bytes

0x0E00 FEESTA 2 R 0x20 Flash/EE status MMR. 0x0E04 FEEMOD 2 R/W 0x0000 Flash/EE control MMR. 0x0E08 FEECON 1 R/W 0x07 Flash/EE control MMR. 0x0E0C FEEDAT 2 R/W 0xXXXX Flash/EE data MMR. 0x0E10 FEEADR 2 R/W 0x0000 Flash/EE address MMR. 0x0E18 FEESIGN 3 R 0xFFFFFF Flash/EE LFSR MMR. 0x0E1C FEEPRO 4 R/W 0x00000000 Flash/EE protection MMR. 0x0E20 FEEHIDE 4 R/W 0xFFFFFFFF Flash/EE protection MMR.

Table 28. PWM Base Address = 0xFFFF0F80

Address Name Bytes

0x0F80 PWMCON 2 R/W 0x0012

0x0F84 PWM0COM0 2 R/W 0x0000 Compare Register 0 for PWM Output 0 and PWM Output 1. 0x0F88 PWM0COM1 2 R/W 0x0000 Compare Register 1 for PWM Output 0 and PWM Output 1. 0x0F8C PWM0COM2 2 R/W 0x0000 Compare Register 2 for PWM Output 0 and PWM Output 1. 0x0F90 PWM0LEN 2 R/W 0x0000 Frequency control for PWM Output 0 and PWM Output 1. 0x0F94 PWM1COM0 2 R/W 0x0000 Compare Register 0 for PWM Output 2 and PWM Output 3. 0x0F98 PWM1COM1 2 R/W 0x0000 Compare Register 1 for PWM Output 2 and PWM Output 3. 0x0F9C PWM1COM2 2 R/W 0x0000 Compare Register 2 for PWM Output 2 and PWM Output 3. 0x0FA0 PWM1LEN 2 R/W 0x0000 Frequency control for PWM Output 2 and PWM Output 3. 0x0FA4 PWM2COM0 2 R/W 0x0000 Compare Register 0 for PWM Output 4 and PWM Output 5. 0x0FA8 PWM2COM1 2 R/W 0x0000 Compare Register 1 for PWM Output 4 and PWM Output 5. 0x0FAC PWM2COM2 2 R/W 0x0000 Compare Register 2 for PWM Output 4 and PWM Output 5. 0x0FB0 PWM2LEN 2 R/W 0x0000 Frequency control for PWM Output 4 and PWM Output 5. 0x0FB8 PWMCLRI 2 W 0x0000

Type Default Value Description

Access Type Default Value Description

PWM control register. See the Pulse-Width Modulatorsection for full details.

PWM interrupt clear register. Writing any value to this register clears a PWM interrupt source.

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RESET

There are four kinds of resets: external reset, power-on reset, watchdog reset, and software reset. The RSTSTA register indicates the source of the last reset and can be written by user code to initiate a software reset event.

The bits in this register can be cleared to 0 by writing to the RSTCLR MMR at 0xFFFF0234. The bit designations in RSTCLR mirror those of RSTSTA. These registers can be used during a reset exception service routine to identify the source of the reset. The implications of all four kinds of reset events are tabulated in Tab l e 3 0 .

RSTSTA Register

Name: RSTSTA

Address: 0xFFFF0230

Default value: Depends on type of reset

Access: Read and write

Function: This 8-bit register indicates the source of the

last reset event and can be written by user code to initiate a software reset.

RSTCLR Register

Name: RSTCLR

Address: 0xFFFF0234

Access: Write only

Function: This 8-bit write only register clears the corres-

ponding bit in RSTSTA.

Table 29. RSTSTA/RSTCLR MMR Bit Designations

Bit Description

7:4

3 External reset.

2 Software reset.

1 Watchdog timeout.

Cleared by setting the corresponding bit in RSTCLR. 0 Power-on reset. Automatically set when a power-on reset occurs. Cleared by setting the corresponding bit in RSTCLR.

If the software reset bit in RSTSTA is set, any write to RSTCLR that does not

clear this bit generates a software reset.

Not used. These bits are not used and always read as 0.

Automatically set to 1 when an external reset occurs.

This bit is cleared by setting the corresponding bit in RSTCLR.

This bit is set to 1 by user code to generate a software reset.

This bit is cleared by setting the corresponding bit in RSTCLR.

Automatically set to 1 when a watchdog timeout occurs.

Table 30. Device Reset Implications

Reset External Pins to

RESET

POR Yes Yes Yes Yes Yes Yes/No RSTSTA[0] = 1 Watchdog Yes Yes Yes Yes No Yes RSTSTA[1] = 1 Software Yes Yes Yes Yes No Yes RSTSTA[2] = 1 External Pin Yes Yes Yes Yes No Yes RSTSTA[3] = 1

Default State

Kernel Executed

Reset All External MMRs (Excluding RSTSTA)

Peripherals Reset

Watc hdog Timer Reset

RAM Valid

RSTSTA (Status After Reset Event)

Rev. C | Page 33 of 108

Page 34

ADuC7060/ADuC7061

OSCILLATOR, PLL, AND POWER CONTROL

CLOCKING SYSTEM

The ADuC706x integrates a 32.768 kHz ±3% oscillator, a clock divider, and a PLL. The PLL locks onto a multiple of the internal oscillator or an external 32.768 kHz crystal to provide a stable

10.24 MHz clock (UCLK) for the system. To allow power saving, the core can operate at this frequency or at binary submultiples of it. The actual core operating frequency, UCLK/2 to as HCLK. The default core clock is the PLL clock divided by 8 (CD = 3) or 1.28 MHz.

OCLK

CRYSTAL

OSCILLATOR

HCLK

WATCHDOG

TIMER

WAKE-UP

TIMER

*32.768kHz±3%

CORE

INT. 32kHz

OSCILLATOR*

32.768kHz

10.24MHz

PLL

UCLK

I2C

Figure 13. Clocking System

External Crystal Selection

To switch to an external crystal, users must follow this procedure:

1. Enable the Timer1 interrupt and configure it for a timeout

period of >120 µs.

2. Follow the write sequence to the PLLCON register, setting the

OSEL bits to [10] and clearing the EXTCLK bit.

3. Force the part into nap mode by following the correct write

sequence to the POWCON register.

4. When the part is interrupted from nap mode by the Timer1

interrupt source, the clock source has switched to the external crystal.

Example source code

T1LD = 0x80; // 32,768 clock ticks T1CON = 0xC0; // Periodic mode, enable

// timer, 32,768 Hz clock/1 IRQEN |= 0x10; // Enable Timer1 interrupt // source PLLKEY1 = 0xAA; // Switch to external crystal PLLCON = 0x2; PLLKEY2 = 0x55;

ANALOG

PERIPHERALS

, is refered

XCLKO

XCLKI

P2.0/EXTCLK

In case of crystal loss, the watchdog timer should be used. During initialization, a test on the RSTSTA can determine if the reset came from the watchdog timer.

External Clock Selection

To switch to an external clock on P2.0, configure P2.0 in Mode 0. The external clock can be up to 20.48 MHz, provided that the tolerance is 1%. The external clock is divided by 2 internally on the part.

Example source code

T1LD = 0x80; T1CON = 0xC0; IRQEN |= 0x10; // Enable Timer1 interrupt

PLLKEY1 = 0xAA; // Switch to external clock PLLCON = 0x4; PLLKEY2 = 0x55;

POWKEY1 = 0x1; // Enter NAP mode POWCON0 = 0x73; POWKEY2 = 0xF4;

The selection of the clock source is in the PLLCON register. By default, the part uses the internal oscillator feeding the PLL.

POWER CONTROL SYSTEM

07079-008

The core clock frequency is changed by writing to the POWCON0 register. This is a key protected register; therefore, Register POWKEY1 and Register POWKEY2 must be written to immediately before and after configuring the POWCON0 register. The following is a simple example showing how to configure the core clock for 10.24 MHz:

POWKEY1 = 0x1; POWCON0 = 0x78; //Set core to max CPU

//speed of 10.24 MHz

POWKEY2 = 0xF4;

A choice of operating modes is available on the ADuC706x. Tabl e 33 describes what part is powered on in the different modes and indicates the power-up time.

Tabl e 34 gives some typical values for the total current consumption (analog + digital supply currents) in the different modes, depending on the clock divider bits. The ADC is turned off. Note that these values also include the current consumption of the regulator and other parts on the test board where these values are measured.

POWKEY1 = 0x1; // Enter nap mode POWCON0 = 0x73; POWKEY2 = 0xF4;

Rev. C | Page 34 of 108

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ADuC7060/ADuC7061

By writing to POWCON1, it is possible to further reduce power consumption in active mode by powering down the UART, PWM

or I

C/SPI blocks. To access POWCON1, POWKEY3 must be set to 0x76 in the instruction immediately before accessing POWCON1 and POWKEY4 must be set to 0xB1 in the instruction immediately after.

For example, the following code enables the SPI/I

C blocks but,

powers down the PWM and UART blocks.

POWKEY3 =0x76; POWCON1 =0x4; //0x100 PWM; 0x20

Uart; 0x4 SPI/I2C POWKEY4 =0xB1;

Power and Clock Control Registers

Name: POWKEY1

Address: 0xFFFF0404

Default value: 0xXXXX

Access: Write

Function: When writing to POWCON0, the value of

0x01 must be written to this register in the instruction immediately before writing to POWCON0.

Name: POWCON0

Address: 0xFFFF0408

Default value: 0x7B

Access: Read and write

Function: This register controls the clock divide bits

controlling the CPU clock (HCLK).

Table 31. POWCON0 MMR Bit Designations

Bit Name Description

7 Reserved This bit must always be set to 0. 6 XPD

PLLPD

PPD

3 COREPD

Cleared to power down the ARM core. Set by default and set by hardware on a wake-up event. 2:0 CD[2:0] Core clock depends on CD setting: [000] = 10.24 MHz [001] = 5.12 MHz [010] = 2.56 MHz [011] = 1.28 MHz [default value] [100] = 640 kHz [101] = 320 kHz [110] = 160 kHz [111] = 80 kHz

XTAL power-down. Cleared by user to power down the external crystal circuitry. Set by user to enable the external crystal circuitry. PLL power-down. Timer peripherals power down if driven from the PLL output clock. Timers driven from an active clock

source remain in normal power mode. This bit is cleared to 0 to power down the PLL. The PLL cannot be powered down if either the core or peripherals are

enabled; Bit 3, Bit 4, and Bit 5 must be cleared simultaneously. Set by default, and set by hardware on a wake-up event.

Peripherals power-down. The peripherals that are powered down by this bit are as follows: SRAM, Flash/EE memory and GPIO interfaces, and SPI/I Cleared to power down the peripherals. The peripherals cannot be powered down if the core is enabled; Bit 3 and Bit 4 must be cleared simultaneously. Set by default and/or by hardware on a wake-up event. Wake-up timer (Timer1) can remain active.

Core power-down. If user code powers down the MCU, include a dummy MCU cycle after the power-down command is written to POWCON0.

Rev. C | Page 35 of 108

C and UART serial ports.

Page 36

ADuC7060/ADuC7061

Name: POWKEY1

Name: POWKEY3

Address: 0xFFFF0404

Default value: 0xXXXX

Access: Write

Function: When writing to POWCON0, the value of

0x01 must be written to this register in the instruction immediately before writing to POWCON0.

Name: POWKEY2

Address: 0xFFFF040C

Default value: 0xXXXX

Access: Write

Function: When writing to POWCON0, the value of

0xF4 must be written to this register in the instruction immediately after writing to POWCON0.

Address: 0xFFFF0434

Default value: 0xXXXX

Access: Write

Function: When writing to POWCON1, the value of

0x76 must be written to this register in the instruction immediately after writing to POWCON1.

Name: POWCON1

Address: 0xFFFF0438

Default value: 0x124

Access: Read and write

Function: This register controls the clock signal to the

PWM, UART and I2C/SPI blocks.

By disabling the clock to these blocks, power consumption is reduced.

Table 32. POWCON1 MMR Bit Designations

Bit Name Description

15:9 Reserved This bit must always be set to 0. 8 PWMOFF

7:6 5

4:3 2

1:0

Reserved UARTOFF

Reserved I2CSPIOFF

Reserved

PWM power-down bit. Set by user to 1 to enable the PWM block. This bit is set by default. Cleared by user to 0 to power down the PWM block. Reserved bits. Always clear these bits to 0.

UART power-down bit. Set by user to 1 to enable the UART block. This bit is set by default. Cleared by user to 0 to power down the UART block. Reserved bits. Always clear these bits to 0. I2C/SPI power-down bit. Set by user to 1 to enable the I2C/SPI blocks. This bit is set by default. Cleared by user to 0 to power down the I2C/SPI blocks. Reserved Bits. Always clear these bits to 0.

Name: POWKEY4

Address: 0xFFFF043C

Default value: 0xXXXX

Access: Write

Function: When writing to POWCON1, the value of 0xB1 must be written to this register in the instruction immediately after

writing to POWCON1.

Rev. C | Page 36 of 108

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ADuC7060/ADuC7061

Table 33. ADuC706x Power Saving Modes

POWCON0[6:3] Mode Core Peripherals PLL XTAL/T2/T3 IRQ0 to IRQ3 Start-Up/Power-On Time

1111 Active Yes Yes Yes Yes Yes 130 ms at CD = 0 1110 Pause Yes Yes Yes Yes 4.8 s at CD = 0; 660 s at CD = 7 1100 Nap Yes Yes Yes 4.8 s at CD = 0; 660 s at CD = 7 1000 Sleep Yes Yes 66 s at CD = 0; 900 s at CD = 7 0000 Stop Yes 66 s at CD = 0; 900 s at CD = 7

Table 34. Typical Current Consumption at 25°C in mA

POWCON0[6:3] Mode CD = 0 CD = 1 CD = 2 CD = 3 CD = 4 CD = 5 CD = 6 CD = 7

1111 Active2 5.22 4.04 2.69 2.01 1.67 1.51 1.42 1.38 1110 Pause3 2.6 1.95 1.6 1.49 1.4 1.33 1.31 1.3 1100 Nap3 1.33 1.29 1.29 1.29 1.29 1.29 1.29 1.29 1000 Sleep3 0.085 0.085 0.085 0.085 0.085 0.085 0.085 0.085 0000 Stop3 0.055 0.055 0.055 0.055 0.055 0.055 0.055 0.055

All values listed in Table 34 have been taken with both ADCs turned off.

In active mode, GP0PAR bit 7 =1.

The values for pause, nap, sleep, and stop modes are measured with the NTRST pin low. To minimize IDD due to nTRST in all modes, set GP0PAR Bit 7 =1. This disables

the internal pull-down on the nTRST pin and means there is no ground path for the external pull-up resistor through the nTRST pin. By default, GP0PAR Bit 7 = 0, therefore, setting this bit in user code will not affect the BMoperation.

Name: PLLKEY1

Address: 0xFFFF0410

Default value: 0xXXXX

Access: Write

Function: When writing to the PLLCON register, the

value of 0xAA must be written to this register in the instruction immediately before writing to PLLCON.

Name: PLLCON

Address: 0xFFFF0414

Default value: 0x00

Access: Read and write

Function: This register selects the clock input to the PLL.

Table 35. PLLCON MMR Bit Designations

Bit Name Description

7:3 Reserved These bits must always be set to 0. 2 EXTCLK

Set this bit to 1 to select external clock input

from P2.0. Clear this bit to disable the external clock. 1:0 OSEL Oscillator selection bits. [00] = internal 32,768 Hz oscillator. [01] = internal 32,768 Hz oscillator. [10] = external crystal. [11] = internal 32,768 Hz oscillator.

Name: PLLKEY2

Address: 0xFFFF0418

Default value: 0xXXXX

Access: Write

Function: When writing to PLLCON, the value of 0x55

must be written to this register in the instruction immediately after writing to PLLCON.

Rev. C | Page 37 of 108

Page 38

ADuC7060/ADuC7061

ADC CIRCUIT INFORMATION

REF–

REF+AVDD

INTERNAL

AGND

REFERENCE

CHOP

MUX

TEMPERATURE

IEXC0

IEXC1

ADC0

ADC1

ADC2

ADC3

ADC4

ADC5

ADC6

ADC7

ADC8

ADC9

GND_SW

50Ω

The ADuC706x incorporates two independent multichannel Σ- ADCs. The primary ADC is a 24-bit, 4-channel ADC. The auxiliary ADC is a 24-bit Σ- ADC, with up to seven singleended input channels.

The primary ADC input has a mux and a programmable gain amplifier on its input stage. The mux on the primary channel can be configured as two fully differential input channels or as four single-ended input channels.

The auxiliary ADC incorporates a buffer on its input stage. Digital filtering is present on both ADCs, which allows

BUF

50µA O/C

DETECT

0.2mA TO 1mA

CHOP

MUX

SENSOR

AVDD

AUX_REFP

AUX_REFM

PGA

BUF

Figure 14. Analog Block Diagram

Σ-∆

MODULATOR

Σ-∆

MODULATOR

DAC0

DAC

OVERRANGE

0.5Hz TO 8kHz

PROGRAMMABLE

FILTER

0.2Hz TO 8kHz

PROGRAMMABLE

FILTER

INTEGRATOR

ACCUMULATOR

CONVERSION

COUNTER

INTERFACE

AND CONTROL

COMPARATORS

TO ARM

07079-009

measurement of a wide dynamic range and low frequency signals such as those in pressure sensor, temperature sensor, weigh scale, or strain gage type applications.

The ADuC706x auxiliary ADC can be configured as four fully differential input channels or as seven single-ended input channels.

Because of internal buffering, the internal channels can convert signals directly from sensors without the need for external signal conditioning.

Rev. C | Page 38 of 108

Page 39

ADuC7060/ADuC7061

Table 36. Primary ADC—Typical Output RMS Noise in Normal Mode (μV)

ADC Register Status

Chop On 4 Hz 0.62 V 0.648 V 0.175 V 0.109 V 0.077 V 0.041 V 0.032 V 0.0338 V 0.032 V 0.033 V Chop Off 50 Hz 1.97 V 1.89 V 0.570 V 0.38 V 0.27 V 0.147 V 0.123 V 0.12 V 0.098 V 0.098 V Chop Off 1 kHz 8.54 V 8.4 V 2.55 V 1.6 V 1.17 V 0.658 V 0.53 V 0.55 V 0.56 V 0.52 V Chop Off 8 kHz 54.97 V 55.54 V 14.30 V 7.88 V 4.59 V 2.5 V 1.71 V 1.75 V 0.915 V 0.909 V

Data Update Rate

±1.2 V (PGA = 1)

±600 mV (PGA = 2)

±300 mV (PGA = 4)

±150 mV (PGA = 8)

Table 37. Primary ADC—Typical Output RMS Effective Number of Bits in Normal Mode (Peak-to-Peak Bits in Parentheses)

ADC Register Status

Chop On 4 Hz 21.9

Chop Off 50 Hz 20.2

Chop Off 1 kHz 18.1

Chop Off 8 kHz 15.4

Data Update Rate

±1.2 V (PGA = 1)

(19.1 p-p)

(17.5 p-p)

(15.3 p-p)

(12.7 p-p)

±600 mV (PGA = 2)

20.8 (18.1 p-p)

19.3 (16.6 p-p)

17.1 (14.4 p-p)

14.4 (11.7 p-p)

±300 mV (PGA = 4)

21.7 (19.0 p-p)

20.0 (17.3 p-p)

17.8 (15.1 p-p)

15.4 (12.6 p-p)

±150 mV (PGA = 8)

21.4 (18.7 p-p)

19.6 (16.9 p-p)

17.5 (14.8 p-p)

15.2 (12.5 p-p)

Table 38. Auxilary ADC—Typical Output RMS Noise

Data Update Rate ADC Register RMS Value

Chop On 4 Hz 0.633 V Chop On 10 Hz 0.810 V Chop Off 1 kHz 7.4 V Chop Off 8 kHz 54.18

V

REFERENCE SOURCES

Both the primary and auxiliary ADCs have the option of using the internal reference voltage or one of two external differential reference sources. The first external reference is applied to the VREF+/VREF− pins. The second external reference is applied to the ADC4/EXT_REF2IN+ and ADC5/EXT_REF2IN− pins. By default, each ADC uses the internal 1.2 V reference source.

For details on how to configure the external reference source for the primary ADC, see the description of the ADC0REF[1:0] bits in the ADC0 control register, ADC0CON.

For details on how to configure the external reference source for the auxiliary ADC, see the description of the ADC1REF[2:0] bits in the ADC1 control register, ADC1CON.

If an external reference source of greater than 1.35 V is needed for ADC0, the HIGHEXTREF0 bit must be set in ADC0CON.

Input Voltage Noise (mV)

±75 mV (PGA = 16)

Input Voltage Noise (mV)

±75 mV (PGA = 16)

20.9 (18.2 p-p)

19.1 (16.4 p-p)

17.0 (14.2 p-p)

15.0 (12.3 p-p)

±37.5 mV (PGA = 32)

20.8 (18.1 p-p)

19.0 (16.2 p-p)

16.8 (14.1 p-p)

14.9 (12.2 p-p)

Similarly, if an external reference source of greater than 1.35 V is used for ADC1, the HIGHEXTREF1 bit must be set in ADC1CON.

DIAGNOSTIC CURRENT SOURCES

To detect a connection failure to an external sensor, the ADuC706x incorporates a 50 A constant current source on the selected analog input channels to both the primary and auxiliary ADCs.

The diagnostic current sources for the primary ADC analog inputs are controlled by the ADC0DIAG[1:0] bits in the ADC0CON register.

Similarly, the diagnostic current sources for the auxiliary ADC analog inputs are controlled by the ADC1DIAG[1:0] bits in the ADC1CON register.

Figure 15. Example Circuit Using Diagnostic Current Sources

AVDD

±18.75 mV (PGA = 64)

20.2 (17.4 p-p)

18.2 (15.5 p-p)

16.1 (13.4 p-p)

14.4 (11.7 p-p)

±9.375 mV (PGA = 128)

19.1 (16.4 p-p)

17.3 (14.6 p-p)

15.1 (12.3 p-p)

13.4 (10.7 p-p)

ADC0 (+)

ADC1 (–)

±4.68 mV (PGA = 256)

18.2 (15.4 p-p)

16.6 (13.8 p-p)

14.0 (11.3 p-p)

13.3 (10.6 p-p)

VIN = ADC0, ADC1

±2.34 mV (PGA = 512)

17.1 (14.4 p-p)

15.5 (12.8 p-p)

13.1 (10.4 p-p)

12.3 (9.6 p-p)

07079-010

Rev. C | Page 39 of 108

Page 40

ADuC7060/ADuC7061

Table 39. Example Scenarios for Using Diagnostic Current Sources

Diagnostic Test

ADC0DIAG[1:0] = 0

ADC0DIAG[1:0] = 1

ADC0DIAG[1:0] = 3

Convert ADC0/ADC1 as normal with diagnostic currents disabled.

Enable a 50 A diagnostic current source on ADC0 by setting ADC0DIAG[1:0] = 1. Convert ADC0 and ADC1.

Convert ADC0 in single-ended mode with diagnostic currents disabled.

Enable a 50 A diagnostic current source on both ADC0 and ADC1 by setting ADC0DIAG[1:0] = 3. Convert ADC0 and ADC1.

SINC3 FILTER

The number entered into Bits[6:0] of the ADCFLT register sets the decimation factor of the sinc3 filter. See Tabl e 46 and Tabl e 4 7 for further details on the decimation factor values.

The range of operation of the sinc3 filter (SF) word depends on whether the chop function is enabled. With chopping disabled, the minimum SF word allowed is 3 and the maximum is 127, giving an ADC throughput range of 50 Hz to 2 kHz.

For details on how to calculate the ADC sampling frequency based on the value programmed to the SF[6:0] bits in the ADCFLT register, refer to Ta b le 4 6.

ADC CHOPPING

The ADCs on the ADuC706x implements a chopping scheme whereby the ADC repeatedly reverses its inputs. Therefore, the decimated digital output values from the sinc3 filter have a positive and negative offset term associated with them. This results in the ADC including a final summing stage that sums and averages each value from the filter with previous filter output values. This new value is then sent to the ADC data MMR. This chopping scheme results in excellent dc offset and offset drift specifications and is extremely beneficial in applications where drift and noise rejection are required.

PROGRAMMABLE GAIN AMPLIFIER

The primary ADC incorporates an on-chip programmable gain amplifier (PGA). The PGA can be programmed through 10 different settings giving a range of 1 to 512. The gain is controlled by the ADC0PGA[3:0] bits in the ADC0CON MMR.

EXCITATION SOURCES

The ADuC706x contains two matched software configurable current sources. These excitation currents are sourced from AVDD. They are individually configurable to give a current range of 200 A to 1 mA. The current step sizes are 200 A.

Normal Result Fault Result

Expected differential result across ADC0/ADC1.

Main ADC changes by ∆V = +50 A × R1. For example, ~100 mV for R1 = 2 kΩ.

Expected voltage on ADC0.

Primary ADC changes by ∆V = 50 A × (R1 − R2), that is, ~10 mV for 10% tolerance.

Rev. C | Page 40 of 108

Detected Measurement for Fault

Short circuit.

Short circuit between ADC0 and ADC1. Short circuit between R1_a and R1_b.

ADC0 open circuit or R1 open circuit.

R1 does not match R2.

Primary ADC reading ≈ 0 V regardless of PGA setting.

Primary ADC reading = +full scale, even on the lowest PGA setting.

Primary ADC reading > 10 mV.

These current sources can be used to excite an external resistive bridge or RTD sensors. The IEXCON MMR controls the excitation current sources. Bit 6 of IEXCON must be set to enable Excitation Current Source 0. Similarly, Bit 7 must be set to enable Excitation Current Source 1. The output current of each current source is controlled by the IOUT[3:0] bits of this register.

It is also possible to configure the excitation current sources to output current to a single output pin, either IEXC0 or IEXC1, by using the IEXC0_DIR and IEXC1_DIR bits of IEXCON. This allows up to 2 mA to output current on a single excitation pin.

ADC LOW POWER MODE

The ADuC706x allows the primary and auxiliary ADCs to be placed in low power operating mode. When configured for this mode, the ADC throughput time is reduced, but the power consumption of the primary ADC is reduced by a factor of about 4; the auxiliary ADC power consumption is reduced by a factor of roughly 3. The maximum ADC conversion rate in low power mode is 2 kHz. The operating mode of the ADCs is controlled by the ADCMDE register. This register configures the part for either normal mode (default), low power mode, or low power plus mode. Low power plus mode is the same as low power mode except that the PGA is disabled. To place the ADCs into low power mode, the following steps must be completed:

• ADCMDE[4:3]—Setting these bits enables normal mode,

low power mode, or low power plus mode.

• ADCMDE[5]—Setting this bit configures the part for low

power mode.

• ADCMDE[7]—Clearing this bit further reduces power

consumption by reducing the frequency of the ADC clock.

Page 41

ADuC7060/ADuC7061

ADC COMPARATOR AND ACCUMULATOR ADC MMR INTERFACE

Every primary ADC result can be compared to a preset threshold level (ADC0TH) as configured via ADCCFG[4:3]. An MCU interrupt is generated if the absolute (sign independent) value of the ADC result is greater than the preprogrammed comparator threshold level. An extended function of this comparator function allows user code to configure a threshold counter (ADC0THV) to monitor the number of primary ADC results that have occurred above or below the preset threshold level. Again, an ADC interrupt is generated when the threshold counter reaches a preset value (ADC0RCR).

Finally, a 32-bit accumulator (ADC0ACC) function can be configured (ADCCFG[6:5]) allowing the primary ADC to add (or subtract) multiple primary ADC sample results. User code can read the accumulated value directly (ADC0ACC) without any further software processing.

TEMPERATURE SENSOR

The ADuC706x provides a voltage output from an on-chip band gap reference proportional to absolute temperature. This voltage output can also be routed through the front-end auxiliary ADC multiplexer (effectively, an additional ADC channel input), facilitating an internal temperature sensor channel that measures die temperature.

The internal temperature sensor is not designed for use as an absolute ambient temperature calculator. It is intended for use as an approximate indicator of the temperature of the ADuC706x die.

The typical temperature coefficient is 0.28 mV/°C.

140

120

The ADCs are controlled and configured through a number of MMRs that are described in detail in the following sections.

In response to an ADC interrupt, user code should interrogate the ADCSTA MMR to determine the source of the interrupt. Each ADC interrupt source can be individually masked via the ADCMSKI MMR described in Tabl e 41 .

All primary ADC result ready bits are cleared by a read of the ADC0DAT MMR. If the primary channel ADC is not enabled, all ADC result ready bits are cleared by a read of the ADC1DAT MMR. To ensure that primary ADC and auxiliary ADC conversion data are synchronous, user code should first read the ADC1DAT MMR and then the ADC0DAT MMR. New ADC conversion results are not written to the ADCxDAT MMRs unless the respective ADC result ready bits are first cleared. The only exception to this rule is the data conversion result updates when the ARM core is powered down. In this mode, ADCxDAT registers always contain the most recent ADC conversion result even though the ready bits are not cleared.

ADC Status Register

Name: ADCSTA

Address: 0xFFFF0500

Default value: 0x0000

Access: Read only

Function: This read-only register holds general status

information related to the mode of operation or current status of the ADuC706x ADCs.

100

ADC OUTPUT (mV)

–60 –40 –20 0 20 40

Figure 16. ADC Output vs. Temperature

60 80 140100 120

TEMPERATURE (° C)

07079-034

Rev. C | Page 41 of 108

Page 42

ADuC7060/ADuC7061

Table 40. ADCSTA MMR Bit Designations

Bit Name Description

15 ADCCALSTA ADC calibration status. This bit is set automatically in hardware to indicate that an ADC calibration cycle has been completed. This bit is cleared after ADCMDE is written to. 14 Not used. This bit is reserved for future functionality. 13 ADC1CERR Auxiliary ADC conversion error.

This bit is cleared when a valid (in-range) voltage conversion result is written to the ADC1DAT register. 12 ADC0CERR Primary ADC conversion error.

This bit is cleared when a valid (in-range) conversion result is written to the ADC0DAT register. 11:7 Not used. These bits are reserved for future functionality and should not be monitored by user code. 6 ADC0ATHEX ADC0 accumulator comparator threshold exceeded.

This bit is cleared when the value in ADC0ACC does not exceed the value in ADC0ATH. 5 Not used. This bit is reserved for future functionality and should not be monitored by user code. 4 ADC0THEX

Otherwise, this bit is cleared. 3 ADC0OVR

2 Not used. This bit is reserved for future functionality and should not be monitored by user code. 1 ADC1RDY Auxiliary ADC result ready bit.

0 ADC0RDY Primary ADC result ready bit.

This bit is cleared by reading ADC0DAT.

This bit is set automatically in hardware to indicate that an auxiliary ADC conversion overrange or underrange has occurred. The conversion result is clamped to negative full scale (underrange error) or positive full scale (overrange error) in this case.

This bit is set automatically in hardware to indicate that a primary ADC conversion overrange or underrange has occurred. The conversion result is clamped to negative full scale (underrange error) or positive full scale (overrange error) in this case.

This bit is set when the ADC0 accumulator value in ADC0ACC exceeds the threshold value programmed in the ADC0 comparator threshold register, ADC0ATH.

Primary channel ADC comparator threshold. This bit is valid only if the primary channel ADC comparator is enabled via the ADCCFG MMR.

This bit is set by hardware if the absolute value of the primary ADC conversion result exceeds the value written in the ADC0TH MMR. If the ADC threshold counter is used (ADC0RCR), this bit is set only when the specified number of primary ADC conversions equals the value in the ADC0THV MMR.

Primary channel ADC overrange bit. If the overrange detect function is enabled via the ADCCFG MMR, this bit is set by hardware if the primary ADC input is grossly (>30% approximate) overrange. This bit is updated every 125 µs. After it is set, this bit can be cleared only by software when ADCCFG[2] is cleared to disable the function, or the ADC gain is changed via the ADC0CON MMR.

If the auxiliary channel ADC is enabled, this bit is set by hardware as soon as a valid conversion result is written in the ADC1DAT MMR. It is also set at the end of a calibration sequence.

This bit is cleared by reading ADC1DAT followed by reading ADC0DAT. ADC0DAT must be read to clear this bit, even if the primary ADC is not enabled.

If the primary channel ADC is enabled, this bit is set by hardware as soon as a valid conversion result is written in the ADC0DAT MMR. It is also set at the end of a calibration sequence.

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ADC Interrupt Mask Register

Name: ADCMSKI

Address: 0xFFFF0504

Default value: 0x0000

Access: Read and write

Function: This register allows the ADC interrupt sources to be enabled individually. The bit positions in this register are the

same as the lower eight bits in the ADCSTA MMR. If a bit is set by user code to 1, the respective interrupt is enabled. By default, all bits are 0, meaning all ADC interrupt sources are disabled.

Table 41. ADCMSKI MMR Bit Designations

Bit Name Description

7 Not used. This bit is reserved for future functionality and should not be monitored by user code. 6 ADC0ATHEX_INTEN ADC0 accumulator comparator threshold exceeded interrupt enable bit. When set to 1, this bit enables an interrupt when the ADC0ATHEX bit in the ADCSTA register is set. When this bit is cleared, this interrupt source is disabled. 5 Not used. This bit is reserved for future functionality and should not be monitored by user code. 4 ADC0THEX_INTEN Primary channel ADC comparator threshold exceeded interrupt enable bit. When set to 1, this bit enables an interrupt when the ADC0THEX bit in the ADCSTA register is set. When this bit is cleared, this interrupt source is disabled. 3 ADC0OVR_INTEN When set to 1, this bit enables an interrupt when the ADC0OVR bit in the ADCSTA register is set. When this bit is cleared, this interrupt source is disabled. 2 Not used. This bit is reserved for future functionality and should not be monitored by user code. 1 ADC1RDY_INTEN Auxiliary ADC result ready bit. When set to 1, this bit enables an interrupt when the ADC1RDY bit in the ADCSTA register is set. When this bit is cleared, this interrupt source is disabled. 0 ADC0RDY_INTEN Primary ADC result ready bit. When set to 1, this bit enables an interrupt when the ADC0RDY bit in the ADCSTA register is set. When this bit is cleared, this interrupt source is disabled.

ADC Mode Register

Name: ADCMDE

Address: 0xFFFF0508

Default value: 0x03

Access: Read and write

Function: The ADC mode MMR is an 8-bit register that configures the mode of operation of the ADC subsystem.

Table 42. ADCMDE MMR Bit Designations

Bit Name Description

7 ADCCLKSEL Set this bit to 1 to enable ADCCLK = 512 kHz. This bit should be set for normal ADC operation. Clear this bit to enable ADCCLK = 131 kHz. This bit should be cleared for low power ADC operation. 6 Not used. This bit is reserved for future functionality and should not be monitored by user code. 5 ADCLPMEN Enable low power mode. This bit has no effect if ADCMDE[4:3] = 00 (ADC is in normal mode). This bit must be set to 1 in low power mode. Clearing this bit in low power mode results in erratic ADC results.

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Bit Name Description

4:3 ADCLPMCFG[1:0] ADC power mode configuration.

[01] = ADC low power mode. [10] = ADC normal mode, same as [00]. [11] = ADC low power plus mode (low power mode and PGA off). 2:0 ADCMD[2:0] ADC operation mode configuration. [000] = ADC power-down mode. All ADC circuits and the input amplifier are powered down.

[00] = ADC normal mode. If enabled, the ADC operates with normal current consumption yielding optimum electrical performance.

[001] = ADC continuous conversion mode. In this mode, any enabled ADC continuously converts at a frequency equal to f

[010] = ADC single conversion mode. In this mode, any enabled ADC performs a single conversion. The ADC enters idle mode when the single shot conversion is complete. A single conversion takes two to three ADC clock cycles, depending on the chop mode.

[011] = ADC idle mode. In this mode, the ADC is fully powered on but is held in reset. The part enters this mode after calibration.

[100] = ADC self-offset calibration. In this mode, an offset calibration is performed on any enabled ADC using an internally generated 0 V. The calibration is carried out at the user-programmed ADC settings; therefore, as with a normal single ADC conversion, it takes two to three ADC conversion cycles before a fully settled calibration result is ready. The calibration result is automatically written to the ADCxOF MMR of the respective ADC. The ADC returns to idle mode, and the calibration and conversion ready status bits are set at the end of an offset calibration cycle. Note: Always use ADC0 for single-ended self-calibration cycles on the primary ADC. Always use ADC0/ADC1 when self-calibrating for a differential input to the primary ADC.

[101] = ADC self-gain calibration. In this mode, a gain calibration against an internal reference voltage is performed on all enabled ADCs. A gain calibration is a two-stage process and takes twice the time of an offset calibration. The calibration result is automatically written to the ADCxGN MMR of the respective ADC. The ADC returns to idle mode and the calibration and conversion ready status bits are set at the end of a gain calibration cycle. An ADC self-gain calibration should only be carried out on the primary channel ADC. Note that self-gain calibration works only when the gain = 1; do not use it when the gain > 1.

[110] = ADC system zero-scale calibration. In this mode, a zero-scale calibration is performed on enabled ADC channels against an external zero-scale voltage driven at the ADC input pins. To do this, short the channel externally.

[111] = ADC system full-scale calibration. In this mode, a full-scale calibration is performed on enabled ADC channels against an external full-scale voltage driven at the ADC input pins. The ADCxGN register is updated after a full-scale calibration sequence.

. ADCxRDY must be cleared to enable new data to be written to ADC0DAT/ADC1DAT.

ADC

Primary ADC Control Register

Name: ADC0CON

Address: 0xFFFF050C

Default value: 0x8000

Access: Read and write

Function: The primary channel ADC control MMR is a 16-bit register. If the primary ADC is reconfigured via ADC0CON, the

auxiliary ADC is also reset.

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Table 43. ADC0CON MMR Bit Designations

Bit Name Description

15 ADC0EN Primary channel ADC enable. This bit is set to 1 by user code to enable the primary ADC.

14:13 ADC0DIAG[1:0] Diagnostic current source enable bits. [00] = current sources off. [01] = enables a 50 A current source on the selected positive input (for example, ADC0). [10] = enables a 50 A current source on the selected negative input (for example, ADC1). [11] = enables a 50 A current source on both selected inputs (for example, ADC0 and ADC1). 12 HIGHEXTREF0

Clear this bit when using the internal reference or an external reference of less than 1.35 V. 11 AMP_CM This bit is set to 1 by user to set the PGA output common-mode voltage to AVDD/2.

10 ADC0CODE Primary channel ADC output coding. This bit is set to 1 by user code to configure primary ADC output coding as unipolar. This bit is cleared to 0 by user code to configure primary ADC output coding as twos complement. 9:6 ADC0CH[3:0] Primary channel ADC input select. [0000] = ADC0/ADC1 (differential mode). [0001] = ADC0/ADC5 (single-ended mode). [0010] = ADC1/ADC5 (single-ended mode). [0011] = VREF+, VREF−. Note: This is the reference selected by the ADC0REF bits. [0100] = Not used. This bit combination is reserved for future functionality and should not be written. [0101] = ADC2/ADC3 (differential mode). [0110] = ADC2/ADC5 (single-ended mode). [0111] = ADC3/ADC5 (single-ended mode). [1000] = internal short to ADC1. [1001] = internal short to ADC1. 5:4 ADC0REF[1:0] Primary channel ADC reference select.

[11] = (AVDD, AGND) divide-by-two selected. 3:0 ADC0PGA[3:0]. Primary channel ADC gain select. Note, nominal primary ADC full-scale input voltage = (VREF/gain). [0000] = ADC0 gain of 1. Buffer of negative input is bypassed. [0001] = ADC0 gain of 2. [0010] = ADC0 gain of 4 (default value). Enables the in-amp. [0011] = ADC0 gain of 8. [0100] = ADC0 gain of 16. [0101] = ADC0 gain of 32. [0110] = ADC0 gain of 64 (maximum PGA gain setting). [0111] = ADC0 gain of 128 (extra gain implemented digitally). [1000] = ADC0 gain of 256. [1001] = ADC0 gain of 512. [1XXX] = ADC0 gain is undefined.

Clearing this bit to 0 powers down the primary ADC and resets the respective ADC ready bit in the ADCSTA MMR to 0.

This bit must be set high if the external reference for ADC0 exceeds 1.35 V. This results in the reference source being divided by 2.

This bit is cleared to 0 by user code to set the PGA output common-mode voltage to the PGA input commonmode voltage level.

[00] = internal reference selected. In ADC low power mode, the voltage reference selection is controlled by ADCMDE[5].

[01] = external reference inputs (VREF+, VREF−) selected. Set the HIGHEXTREF0 bit if the reference voltage exceeds 1.3 V.

[10] = auxiliary external reference inputs (ADC4/EXT_REF2IN+, ADC5/EXT_REF2IN−) selected. Set the HIGHEXTREF0 bit if the reference voltage exceeds 1.3 V.

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Auxiliary ADC Control Register

Name: ADC1CON

Address: 0xFFFF0510

Default value: 0x0000

Access: Read and write

Function: The auxiliary ADC control MMR is a 16-bit register.

Table 44. ADC1CON MMR Bit Designations

Bit Name Description

15 ADC1EN Auxiliary channel ADC enable. This bit is set to 1 by user code to enable the auxiliary ADC. Clearing this bit to 0 powers down the auxiliary ADC. 14:13 ADC1DIAG[1:0]

[00]= current sources off. [01] = enables a 50 A current source on selected positive input (for example, ADC2). [10] = enables a 50  A current source on selected negative input (for example, ADC3). [11] = enables a 50  A current source on both selected inputs (for example, ADC2 and ADC3). 12 HIGHEXTREF1

Clear this bit when using the internal reference or an external reference of less than 1.35 V. 11 ADC1CODE Auxiliary channel ADC output coding. This bit is set to 1 by user code to configure auxiliary ADC output coding as unipolar. This bit is cleared to 0 by user code to configure auxiliary ADC output coding as twos complement. 10:7 ADC1CH[3:0]

[0000] = ADC2/ADC3 (differential mode). [0001] = ADC4/ADC5 (differential mode). [0010] = ADC6/ADC7 (differential mode). [0011] = ADC8/ADC9 (differential mode). [0100] = ADC2/ADC5 (single-ended mode). [0101] = ADC3/ADC5 (single-ended mode). [0110] = ADC4/ADC5 (single-ended mode). [0111] = ADC6/ADC5 (single-ended mode). [1000] = ADC7/ADC5 (single-ended mode). [1001] = ADC8/ADC5 (single-ended mode). [1010] = ADC9/ADC5 (single-ended mode).

[1011] = internal temperature sensor+/internal temperature sensor−. [1100] = VREF+, VREF−. Note: This is the reference selected by the ADC1REF bits. [1101] = DAC_OUT/AGND. [1110] = undefined. [1111] = internal short to ADC3.

Diagnostic current source enable bits. This is the same current source as that used on ADC0DIAG[1:0]. The ADCs cannot enable the diagnostic current sources at the same time.

This bit must be set high if the external reference for ADC1 exceeds 1.35 V. This results in the reference source being divided by 2.

Auxiliary channel ADC input select. Note: Single-ended channels are selected with respect to ADC5. Bias ADC5 to a minimum level of 0.1 V.

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Bit Name Description

6:4 ADC1REF[2:0] Auxiliary channel ADC reference select.

[100] = (AVDD, ADC3). ADC3 can be used as the negative input terminal for the reference source. [101] to [111] = reserved. 3:2 BUF_BYPASS[1:0] Buffer bypass. [00] = full buffer on. Both positive and negative buffer inputs active. [01] = negative buffer is bypassed, positive buffer is on. [10] = negative buffer is on, positive buffer is bypassed. [11] = full buffer bypass. Both positive and negative buffer inputs are off. 1:0 [00] = ADC1 gain = 1. [01] = ADC1 gain = 2.

[000] = internal reference selected. In ADC low power mode, the voltage reference selection is controlled by ADCMODE[5].

[001] = external reference inputs (VREF+, VREF−) selected. Set the HIGHEXTREF1 bit if reference voltage exceeds 1.3 V.

[010] = auxiliary external reference inputs (ADC4/EXT_REF2IN+, ADC5/EXT_REF2IN−) selected. Set the HIGHEXTREF1 bit if reference voltage exceeds 1.35 V.

[011] = (AVDD, AGND) divide-by-2 selected. If this configuration is selected, the HIGHEXTREF1 bit is set automatically.

Digital gain. Select for auxiliary ADC inputs.

[10] = ADC1 gain = 4. [11] = ADC1 gain = 8.

ADC Filter Register

Name: ADCFLT

Address: 0xFFFF0514

Default value: 0x0007

Access: Read and write

Function: The ADC filter MMR is a 16-bit register that controls the speed and resolution of both the on-chip ADCs. Note that, if

ADCFLT is modified, the primary and auxiliary ADCs are reset.

Table 45. ADCFLT MMR Bit Designations

Bit Name Description

15 CHOPEN

14 RAVG2 Running average-by-2 enable bit.

Cleared by user to disable the running average function. 13:8 AF[5:0]

Chop enable. Set by user to enable system chopping of all active ADCs. When this bit is set, the ADC has very low offset errors and drift, but the ADC output rate is reduced by a factor of 3 if AF = 0 (see sinc3 decimation factor, Bits[6:0] in this table). If AF > 0, then the ADC output update rate is the same with chop on or off. When chop is enabled, the settling time is two output periods.

Set by user to enable a running-average-by-2 function, reducing ADC noise. This function is automatically enabled when chopping is active. It is an optional feature when chopping is inactive, and if enabled (when chopping is inactive), does not reduce the ADC output rate but does increase the settling time by one conversion period.

Averaging factor (AF). The values written to these bits are used to implement a programmable first-order sinc3 post filter. The averaging factor can further reduce ADC noise at the expense of output rate as described in Bits[6:0] (sinc3 decimation factor) in this table.

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Bit Name Description

7 NOTCH2

6:0 SF[6:0]

For SF = 126, f

For information on calculating the f

Due to limitations on the digital filter internal data path, there are some limitations on the combinations of the sinc3 decimation factor (SF) and averaging factor (AF)

that can be used to generate a required ADC output rate. This restriction limits the minimum ADC update in normal power mode to 4 Hz or 1 Hz in lower power mode.

In low power mode, the ADC is driven directly by the low power oscillator (131 kHz) and not 512 kHz. All f

Table 46. ADC Conversion Rates and Settling Times

Chop Enabled

No No No

No No Yes

No Yes No

No Ye s Yes

Yes N/A N/A

An additional time of approximately 60 µs per ADC is required before the first ADC is available.

Table 47. Allowable Combinations of SF and AF

AF Range SF 0 1 to 7 8 to 63

0 to 31 Yes Yes Yes 32 to 63 Yes Yes No 64 to 127 Yes No No

Sinc3 modify. Set by user to modify the standard sinc3 frequency response to increase the filter stop-band rejection by approximately 5 dB. This is achieved by inserting a second notch (NOTCH2) at

= 1.333 × f

NOTCH2

where f

is the location of the first notch in the response.

NOTCH

Sinc3 decimation factor (SF)

NOTCH

.The value (SF) written in these bits controls the oversampling (decimation factor) of the

sinc3 filter. The output rate from the sinc3 filter is given by

= (512,000/([SF + 1] × 64)) Hz

ADC

when the chop bit (Bit 15, chop enable) = 0 and the averaging factor (AF) = 0. This is valid for all SF values ≤ 125.

is forced to 60 Hz.

ADC

For SF = 127, f

Averaging Fac tor

is forced to 50 Hz.

ADC

Running Average f

for SF (other than 126 and 127) and AF values, refer to Tab le 46.

ADC

Normal Mode f

ADC

000,512

64]1[

×+SF

000,512

64]1[

×+SF

000,512

]3[64]1[

AFSF +××+

000,512

]3[64]1[

AFSF +××+

000,512

Low Power Mode t

ADC

072,131

64]1[

×+SF

072,131

64]1[

×+SF

3]3[64]1[

++××+ AFSF 3]3[64]1[

072,131

AFSF +××+

072,131

AFSF +××+

072,131

calculations should be divided by 4 (approximately).

ADC

SETTLING

ADC

]3[64]1[

++××+ AFSF

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ADuC7060/ADuC7061

ADC Configuration Register

Name: ADCCFG

Address: 0xFFFF0518

Default value: 0x00

Access: Read and write

Function: The 8-bit ADC configuration MMR controls extended functionality related to the on-chip ADCs.

Table 48. ADCCFG MMR Bit Designations

Bit Name Description

7 GNDSW_EN Analog ground switch enable.

When this bit is cleared, the analog ground switch is disconnected from the external pin. 6:5

4:3 ADC0CMPEN[1:0] Primary ADC comparator enable bits. [00] = comparator disabled. [01] = comparator active. Interrupt asserted if absolute value of ADC0 conversion result |I| ≥ ADC0TH.

2 ADC0OREN ADC0 overrange enable.

Do not use this feature in ADC low power mode. 1 GNDSW_RES_EN Set to 1 to enable a 20 kΩ resistor in series with the ground switch. Clear this bit to disable this resistor. 0 ADCRCEN ADC result counter enable. Set by user to enable the result count mode. ADC interrupts occur if ADC0RCR = ADC0RCV. Cleared to disable the result counter. ADC interrupts occur after every conversion.

ADC0ACCEN[1:0] Primary channel (32-bit) accumulator enable.

[11] = accumulator and comparator active. This causes an ADC0 interrupt if ADCMSKI[6] is set.

This bit is set to 1 by user software to connect the external GND_SW pin to an internal analog ground reference point. This bit can be used to connect and disconnect external circuits and components to ground under program control and thereby minimize dc current consumption when the external circuit or component is not being used. This bit is used in conjunction with ADCCFG[1] to select a 20 kΩ resistor to ground.

[00] = accumulator disabled and reset to 0. The accumulator must be disabled for a full ADC conversion (ADCSTA[0] set twice) before the accumulator can be re-enabled to ensure that the accumulator is reset.

[01] = accumulator active. Positive current values are added to the accumulator total; the accumulator can overflow if allowed to run for >65,535 conversions. Negative current values are subtracted from the accumulator total; the accumulator is clamped to a minimum value of 0.

[10] = accumulator active. Same as [01] except that there is no clamp. Positive current values are added to the accumulator total; the accumulator can overflow if allowed to run for >65,535 conversions. The absolute values of negative current are subtracted from the accumulator total; the accumulator in this mode continues to accumulate negatively, below 0.

[10] = comparator count mode active. Interrupt asserted if absolute value of ADC0 conversion result |I| ≥ ADC0TH for the number of ADC0THC conversions. A conversion value |I| < ADC0TH resets the threshold counter value (ADC0THV) to 0.

[11] = comparator count mode active, interrupt asserted if absolute value of ADC0 conversion result |I| ≥ ADC0TH for the number of ADC0THC conversions. A conversion value |I| < ADC0TH decrements the threshold counter value (ADC0THV) toward 0.

Set by the user to enable a coarse comparator on the primary channel ADC. If the reading is grossly (>30% approximate) overrange for the active gain setting, the overrange bit in the ADCSTA MMR is set. The ADC reading must be outside this range for greater than 125 µs for the flag to be set.

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Primary Channel ADC Data Register

Name: ADC0DAT

Primary Channel ADC Offset Calibration Register

Name: ADC0OF

Address: 0xFFFF051C

Default value: 0x00000000

Access: Read only

Function: This ADC data MMR holds the 24-bit

conversion result from the primary ADC. The ADC does not update this MMR if the ADC0 conversion result ready bit (ADCSTA[0]) is set. A read of this MMR by the MCU clears all asserted ready flags (ADCSTA[1:0]).

Table 49. ADC0DAT MMR Bit Designations

Bit Description

23:0 ADC0 24-bit conversion result.

Auxiliary Channel ADC Data Register

Name: ADC1DAT

Address: 0xFFFF0520

Default value: 0x00000000

Access: Read only

Function: This ADC data MMR holds the 24-bit

conversion result from the auxiliary ADC. The ADC does not update this MMR if the ADC0 conversion result ready bit (ADCSTA[1]) is set.

Address: 0xFFFF0524

Default value: Part specific, factory programmed

Access: Read and write

Function: This ADC offset MMR holds a 16-bit offset

calibration coefficient for the primary ADC. The register is configured at power-on with a factory default value. However, this register automatically overwrites if an offset calibration of the primary ADC is initiated by the user via bits in the ADCMDE MMR. User code can write to this calibration register only if the ADC is in idle mode. An ADC must be enabled and in idle mode before being written to any offset or gain register. The ADC must be in idle mode for at least 23 µs.

Table 51. ADC0OF MMR Bit Designations

Bit Description

15:0 ADC0 16-bit offset calibration value.

Auxiliary Channel ADC Offset Calibration Register

Name: ADC1OF

Address: 0xFFFF0528

Default value: Part specific, factory programmed

Access: Read and write

Table 50. ADC1DAT MMR Bit Designations

Bit Description

23:0 ADC1 24-bit conversion result.

Function: This offset MMR holds a 16-bit offset

calibration coefficient for the auxiliary channel. The register is configured at poweron with a factory default value. However, this register is automatically overwritten if an offset calibration of the auxiliary channel is initiated by the user via bits in the ADCMDE MMR. User code can write to this calibration register only if the ADC is in idle mode. An ADC must be enabled and in idle mode before being written to any offset or gain register. The ADC must be in idle mode for at least 23 µs.

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Table 52. ADC1OF MMR Bit Designations

Bit Description

15:0 ADC1 16-bit offset calibration value.

Primary Channel ADC Gain Calibration Register

Name: ADC0GN

Address: 0xFFFF052C

Default value: Part specific, factory programmed

Access: Read and write

Function: This gain MMR holds a 16-bit gain

calibration coefficient for scaling the primary ADC conversion result. The register is configured at power-on with a factory default value. However, this register is automatically overwritten if a gain calibration of the primary ADC is initiated by the user via bits in the ADCMDE MMR. User code can write to this calibration register only if the ADC is in idle mode. An ADC must be enabled and in idle mode before being written to any offset or gain register. The ADC must be in idle mode for at least 23 s.

Table 53. ADC0GN MMR Bit Designations

Bits Description

15:0 ADC0 16-bit calibration gain value.

Auxiliary Channel Gain Calibration Register

Name: ADC1GN

Address: 0xFFFF0530

Default value: Part specific, factory programmed

Access: Read and write

Function: This gain MMR holds a 16-bit gain calibra-

tion coefficient for scaling an auxiliary channel conversion result. The register is configured at power-on with a factory default value. However, this register is automatically overwritten if a gain calibration of the auxiliary channel is initiated by the user via bits in the ADCMDE MMR. User code can write to this calibration register only if the ADC is in idle mode. An ADC must be enabled and in idle mode before being written to any offset or gain register. The ADC must be in idle mode for at least 23 µs.

Primary Channel ADC Result Counter Limit Register

Name: ADC0RCR

Address: 0xFFFF0534

Default value: 0x0001

Access: Read and write

Function: This 16-bit MMR sets the number of

conversions required before an ADC interrupt is generated. By default, this register is set to 0x01. The ADC counter function must be enabled via the ADC result counter enable bit in the ADCCFG MMR.

Table 55. ADC0RCR MMR Bit Designations

Bits Description

15:0 ADC0 result counter limit/reload register.

Primary Channel ADC Result Counter Register

Name: ADC0RCV

Address: 0xFFFF0538

Default value: 0x0000

Access: Read only

Function: This 16-bit, read-only MMR holds the

current number of primary ADC conversion results. It is used in conjunction with ADC0RCR to mask primary channel ADC interrupts, generating a lower interrupt rate. When ADC0RCV = ADC0RCR, the value in ADC0RCV resets to 0 and recommences counting. It can also be used in conjunction with the accumulator (ADC0ACC) to allow an average calculation to be taken. The result counter is enabled via ADCCFG[0]. This MMR is also reset to 0 when the primary ADC is reconfigured, that is, when the ADC0CON or ADCMDE is written.

Table 56. ADC0RCV MMR Bit Designations

Bits Description

15:0 ADC0 result counter register.

Table 54. ADC1GN MMR Bit Designations

Bits Description

15:0 ADC1 16-bit gain calibration value.

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Primary Channel ADC Threshold Register

Name: ADC0TH

Primary Channel ADC Threshold Counter Register

Name: ADC0THV

Address: 0xFFFF053C

Default value: 0x0000

Access: Read and write

Function: This 16-bit MMR sets the threshold against

which the absolute value of the primary ADC conversion result is compared. In unipolar mode, ADC0TH[15:0] are compared, and in twos complement mode, ADC0TH[14:0] are compared.

Table 57. ADC0TH MMR Bit Designations

Bit Description

15:0 ADC0 16-bit comparator threshold register.

Primary Channel ADC Threshold Counter Limit Register

Name: ADC0THC

Address: 0xFFFF0540

Default value: 0x0001

Access: Read and write

Function: This 8-bit MMR determines how many

cumulative (values below the threshold decrement or reset the count to 0) primary ADC conversion result readings above ADC0TH must occur before the primary ADC comparator threshold bit is set in the ADCSTA MMR, generating an ADC interrupt. The primary ADC comparator threshold bit is asserted as soon as ADC0THV = ADC0RCR.

Table 58. ADC0THC MMR Bit Designations

Bit Description

15:8 Reserved. 7:0 ADC0 8-bit threshold counter limit register.

Address: 0xFFFF0544

Default value: 0x0000

Access: Read only

Function: This 8-bit MMR is incremented every time

the absolute value of a primary ADC conversion result |Result| ≥ ADC0TH. This register is decremented or reset to 0 every time the absolute value of a primary ADC conversion result |Result| < ADC0TH. The configuration of this function is enabled via the primary channel ADC comparator bits in the ADCCFG MMR.

Table 59. ADC0THV MMR Bit Designations

Bit Description

7:0 ADC0 8-bit threshold exceeded counter register.

Primary Channel ADC Accumulator Register

Name: ADC0ACC

Address: 0xFFFF0548

Default value: 0x00000000

Access: Read only

Function: This 32-bit MMR holds the primary ADC

accumulator value. The primary ADC ready bit in the ADCSTA MMR should be used to determine when it is safe to read this MMR. The MMR value is reset to 0 by disabling the accumulator in the ADCCFG MMR or by reconfiguring the primary channel ADC.

Table 60. ADC0ACC MMR Bit Designations

Bit Description

31:0 ADC0 32-bit accumulator register.

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Primary Channel ADC Comparator Threshold Register Table 61. ADC0ATH MMR Bit Designations

Name: ADC0ATH

Address: 0xFFFF054C

Default value: 0x00000000

Access: Read and write

Function: This 32-bit MMR holds the threshold value for

the accumulator comparator of the primary channel. When the accumulator value in ADC0ACC exceeds the value in ADC0ATH, the ADC0ATHEX bit in ADCSTA is set. This causes an interrupt if the corresponding bit in ADCMSKI is also enabled.

INTERRUPT

ADC

|ABSVAL|

INTERRUPT (ADC0RDY)

ADC0TH

(ADC0OVR)

CLEAR

ADC0

ADC1

(DEFAULT = 1)

FAST

OVERRANGE

PRIMARY

ADC

ADC0RCV COUNTER

ADC

ADC0RCR

(READABLE)

Figure 17. Primary ADC Accumulator/Comparator/Counter Block Diagram

Bit Description

31:0

ADC0 32-bit comparator threshold register of the accumulator.

(READABLE)

ADC0ACC

ACCUMULATOR

≥≥

ADC

ADC0ATH

ADC0THV

UP/DOWN

OPTION: UP/RESET

ADC0THC

≥

INTERRUPT (ADC0ATHEX)

INTERRUPT

≥

(ADC0THEX)

7079-011

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ADuC7060/ADuC7061

Excitation Current Sources Control Register

Name: IEXCON

Address: 0xFFFF0570

Default value: 0x00

Access: Read and write

Function: This 8-bit MMR controls the two excitation current sources, IEXC0 and IEXC1.

Table 62. IEXCON MMR Bit Designations

Bit Name Description

7 IEXC1_EN Enable bit for IEXC1 current source. Set this bit to 1 to enable Excitation Current Source 1. Clear this bit to disable Excitation Current Source 1. 6 IEXC0_EN Enable bit for IEXC0 current source. Set this bit to 1 to enable Excitation Current Source 0. Clear this bit to disable Excitation Current Source 0. 5 IEXC1_DIR Set this bit to 1 to direct Excitation Current Source 1 to the IEXC0 pin. Set this bit to 0 to direct Excitation Current Source 1 to the IEXC1 pin. 4 IEXC0_DIR Set this bit to 1 to direct Excitation Current Source 0 to the IEXC1 pin. Set this bit to 0 to direct Excitation Current Source 0 to the IEXC0 pin. 3:1 IOUT[3:1] These bits control the excitation current level for each source. IOUT[3:1] = 000, excitation current = 0 A + (IOUT[0] × 10 A). IOUT[3:1] = 001, excitation current = 200 A + (IOUT[0] × 10 A). IOUT[3:1] = 010, excitation current = 400 A + (IOUT[0] × 10 A). IOUT[3:1] = 011, excitation current = 600 A + (IOUT[0] × 10 A). IOUT[3:1] = 100, excitation current = 800 A + (IOUT[0] × 10 A). IOUT[3:1] = 101, excitation current = 1 mA + (IOUT[0] × 10 A). All other values are undefined. 0 IOUT[0] Set this bit to 1 to enable 10 A diagnostic current source. Clear this bit to 0 to disable 10 A diagnostic current source.

EXAMPLE APPLICATION CIRCUITS

Figure 18 shows a simple bridge sensor interface to the ADuC706x, including the RC filters on the analog input channels. Notice that the sense lines from the bridge (connecting to the reference inputs) are wired separately from the excitation lines (going to DVDD/AVDD and ground). This results in a total of six wires going to the bridge. This 6-wire connection scheme is a feature of most off-the-shelf bridge transducers (such as load cells) that helps to minimize errors that would otherwise result from wire impedances.

In Figure 19, the AD592 is an external temperature sensor used to measure the thermocouple cold junction, and its output is connected to the auxiliary channel. The ADR280 is an external 1.2 V reference part—alternatively, the internal reference can be used. Here, the thermocouple is connected to the primary ADC as a differential input to ADC0/ADC1. Note the resistor between VREF+ and ADC1 to bias the ADC inputs above 100 mV.

Figure 20 shows a simple 4-wire RTD interface circuit. As with the bridge transducer implementation in Figure 18, if a power supply and a serial connection to the outside world are added, Figure 20 represents a complete system.

Rev. C | Page 54 of 108

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ADuC7060/ADuC7061

ADuC7060/

ADuC7061

IEXC1

ADC0

ADC1

AVD D/D VDD

SPI

UART

GPIO

+2.5V

ADuC7060/

ADuC7061

AVD D/D VDD

VREF+

ADC0

ADC1

SPI

UART

GPIO

RTD

AD592

ADR280

VREF–

AGND/DGND

Figure 18. Bridge Interface Circuit

ADuC7060/

ADuC7061

AVD D/D VDD

ADC0

ADC1

ADC4

VREF+

VREF–

SPI

UART

GPIO

AGND/DG ND

07079-012

Figure 20. Example of an RTD Interface Circuit

+2.5V

07079-013

VREF+

VREF–

AGND/DGND

07079-014

Figure 19. Example of a Thermocouple Interface Circuit

Rev. C | Page 55 of 108

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ADuC7060/ADuC7061

DAC PERIPHERALS

DAC

The ADuC706x incorporates a voltage output DAC on chip. In normal mode, the DAC resolution is 12-bits. In interpolation, the DAC resolution is 16 bits with 14 effective bits. The DAC has a rail-to-rail voltage output buffer capable of driving 5 kΩ/100 pF.

The DAC has four selectable ranges.

• 0 V to V

• VREF− to VREF+

• ADC5/EXT_REF2IN− to ADC4/EXT_REF2IN+

• 0 V to AVDD

The maximum signal range is 0 V to AVDD.

Table 63. DAC0CON MMR Bit Designations

Bit Name Description

15:10 Reserved. 9 DACPD Set to 1 to power down DAC output (DAC output is tristated). Clear this bit to enable the DAC. 8 DACBUFLP

Clear this bit to enable the DAC buffer. 7 OPAMP Set to 1 to place the DAC output buffer in op amp mode. Clear this bit to enable the DAC output buffer for normal DAC operation. 6 DACBUFBYPASS Set to 1 to bypass the output buffer and send the DAC output directly to the output pin. Clear this bit to buffer the DAC output. 5 DACCLK Cleared to 0 to update the DAC on the negative edge of HCLK.

3 DACMODE Set to 1 to enable the DAC in 16-bit interpolation mode. Set to 0 to enable the DAC in normal 12-bit mode. 2 Rate Used with interpolation mode. Set to 1 to configure the interpolation clock as UCLK/16. Set to 0 to configure the interpolation clock as UCLK/32. 1:0 DAC range bits [11] = 0 V to AVDD range. [10] = ADC5/EXT_REF2IN− to ADC4/EXT_REF2IN+. [01] = VREF− to VREF+. [00] = 0 V to V

(internal band gap 1.2 V reference)

REF

Set to 1 to place the DAC output buffer in low power mode. See the Normal DAC Mode and Op Amp Mode sections for further details on electrical specifications.

Set to 1 to update the DAC on the negative edge of Timer1. This mode is ideally suited for waveform generation where the next value in the waveform is written to DAC0DAT at regular intervals of Timer1.

DACCLR

Set to 1 for normal DAC operation. Set to 0 to clear the DAC output and to set DAC0DAT to 0. Writing to this bit has an immediate effect on the DAC

output.

(1.2 V) range. Internal reference source.

REF

Op Amp Mode

As an option, the DAC can be disabled and its output buffer used as an op amp.

MMR INTERFACE

The DAC is configurable through a control register and a data register.

DAC0CON Register

Name: DAC0CON

Address: 0xFFFF0600

Default value: 0x0200

Access: Read and write

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ADuC7060/ADuC7061

DAC0DAT Register

Name: DAC0DAT

Address: 0xFFFF0604

Default value: 0x00000000

Access: Read and write

Function: This 32-bit MMR contains the DAC output

value.

Table 64. DAC0DAT MMR Bit Designations

Bit Description

31:28 Reserved. 27:16 12-bit data for DAC0. 15:12 Extra four bits used in interpolation mode. 11:0 Reserved.

USING THE DAC

The on-chip DAC architecture consists of a resistor string DAC followed by an output buffer amplifier.

The reference source for the DAC is user selectable in software. It can be AVDD, VREF±, or ADCx/EXT_REF2IN±.

Code 4095. Linearity degradation near ground and AVDD is caused by saturation of the output amplifier, and a general representation of its effects (neglecting offset and gain error) is illustrated in Figure 21. The dotted line in Figure 21 indicates the ideal transfer function, and the solid line represents what the transfer function may look like with endpoint nonlinearities due to saturation of the output amplifier. Note that Figure 21 represents a transfer function in 0-to-AVDD mode only. In 0-to-V or, VREF±, and ADCx/EXT_REF2IN± modes (with V

< AVDD

REF

or ADCx/EXT_REF2IN± < AVDD), the lower nonlinearity is similar. However, the upper portion of the transfer function follows the ideal line all the way to the end (V

in this case, not

REF

AVDD), showing no signs of endpoint linearity errors.

AVDD

AVDD – 100mV

• In 0-to-AVDD mode, the DAC output transfer function

spans from 0 V to the voltage at the AVDD pin.

• In VREF± and ADCx/EXT_REF2IN± modes, the DAC

output transfer function spans from negative input voltage to the voltage positive input pin. Note that these voltages must never go below 0 V or above AVDD.

• In 0-to-V

from 0 V to the internal 1.2 V reference, V

mode, the DAC output transfer function spans

REF

The DAC can be configured in three different user modes: normal mode, DAC interpolation mode, and op amp mode.

Normal DAC Mode

In this mode of operation, the DAC is configured as a 12-bit voltage output DAC. By default, the DAC buffer is enabled, but the output buffer can be disabled. If the DAC output buffer is disabled, the DAC is capable of driving a capacitive load of only 20 pF. The DAC buffer is disabled by setting the DACBUFBYPASS bit in DAC0CON.

The DAC output buffer amplifier features a true, rail-to-rail output stage implementation. This means that when unloaded, each output is capable of swinging to within less than 5 mV of both AVDD and ground. Moreover, the linearity specification of the DAC (when driving a 5 k resistive load to ground) is guaranteed through the full transfer function except for Code 0 to Code 100 and, in 0-to- AVDD mode only, Code 3995 to

100mV

0x00000000 0x0FFF0000

Figure 21. Endpoint Nonlinearities Due to Amplifier Saturation

07079-015

The endpoint nonlinearities conceptually illustrated in Figure 21 worsen as a function of output loading. Most of the ADuC706x data sheet specifications in normal mode assume a 5 kΩ resistive load to ground at the DAC output. As the output is forced to source or sink more current, the nonlinear regions at the top or bottom (respectively) of Figure 21 become larger. With larger current demands, this can significantly limit output voltage swing.

DAC Interpolation Mode

In interpolation mode, a higher DAC output resolution of 16 bits is achieved with a longer update rate than normal mode. The update rate is controlled by the interpolation clock rate selected in the DAC0CON register. In this mode, an external RC filter is required to create a constant voltage.

Op Amp Mode

In op amp mode, the DAC output buffer is used as an op amp with the DAC itself disabled.

ADC6 is the positive input to the op amp, ADC7 is the negative input, and ADC8 is the output. In this mode, the DAC should be powered down by setting Bit 9 of DAC0CON.

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ADuC7060/ADuC7061

NONVOLATILE FLASH/EE MEMORY

The ADuC706x incorporates Flash/EE memory technology on chip to provide the user with nonvolatile, in-circuit reprogrammable memory space.

Like EEPROM, flash memory can be programmed in-system at a byte level, although it must first be erased. The erase is performed in page blocks. As a result, flash memory is often and, more correctly, referred to as Flash/EE memory.

Overall, Flash/EE memory represents a step closer to the ideal memory device that includes nonvolatility, in-circuit programmability, high density, and low cost. Incorporated in the ADuC706x, Flash/EE memory technology allows the user to update program code space in-circuit, without the need to replace one time programmable (OTP) devices at remote operating nodes.

The ADuC706x contains a 32 kB array of Flash/EE memory. The lower 30 kB are available to the user and the upper 2 kB contain permanently embedded firmware, allowing in-circuit serial download. These 2 kB of embedded firmware also contain a power-on configuration routine that downloads factorycalibrated coefficients to the various calibrated peripherals (such as ADC, temperature sensor, and band gap references). This 2 kB embedded firmware is hidden from user code.

Retention quantifies the ability of the Flash/EE memory to retain its programmed data over time. Again, the parts are qualified in accordance with the formal JEDEC Retention Lifetime Specification A117 at a specific junction temperature

= 85°C). As part of this qualification procedure, the Flash/

EE memory is cycled to its specified endurance limit, described previously, before data retention is characterized. This means that the Flash/EE memory is guaranteed to retain its data for its fully specified retention lifetime every time that the Flash/EE memory is reprogrammed. Also note that retention lifetime, based on activation energy of 0.6 eV, derates with T in

Figure 22.

600

450

300

RETENTI ON (Years)

150

, as shown

FLASH/EE MEMORY RELIABILITY

The Flash/EE memory arrays on the parts are fully qualified for two key Flash/EE memory characteristics: Flash/EE memory cycling endurance and Flash/EE memory data retention.

Endurance quantifies the ability of the Flash/EE memory to be cycled through many program, read, and erase cycles. A single endurance cycle is composed of four independent, sequential events, defined as

• Initial page erase sequence

• Read/verify sequence for a single Flash/EE

• Byte program sequence memory

• Second read/verify sequence endurance cycle

In reliability qualification, every half word (16-bit wide) location of the three pages (top, middle, and bottom) in the Flash/EE memory is cycled 10,000 times from 0x0000 to 0xFFFF. The Flash/EE memory endurance qualification is carried out in accordance with JEDEC Retention Lifetime Specification A117 over the industrial temperature range of

−40°C to +125°C. The results allow the specification of a minimum endurance figure over a supply temperature of 10,000 cycles.

30 40 55 70 85 100 125 135 150

JUNCTION TEMPERATURE (°C)

Figure 22. Flash/EE Memory Data Retention

07079-016

PROGRAMMING

The 30 kB of Flash/EE memory can be programmed in-circuit, using the serial download mode or the provided JTAG mode.

Serial Downloading (In-Circuit Programming)

The ADuC706x facilitates code download via the standard UART serial port. The parts enter serial download mode after a

reset or power cycle if the NTRST/ through an external 1 kΩ resistor. When in serial download mode, the user can download code to the full 30 kB of Flash/EE memory while the device is in-circuit in its target application hardware. An executable PC serial download is provided as part of the development system for serial downloading via the UART.

When the ADuC706x enters download mode, the user should be aware that the internal watchdog is enabled with a time-out period of 2 minutes. If the flash erase/write sequence is not completed in this period, a reset occurs.

JTAG Access

The JTAG protocol uses the on-chip JTAG interface to facilitate code download and debug.

pin is pulled low

Rev. C | Page 58 of 108

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ADuC7060/ADuC7061

PROCESSOR REFERENCE PERIPHERALS

INTERRUPT SYSTEM

There are 15 interrupt sources on the ADuC706x that are controlled by the interrupt controller. All interrupts are generated from the on-chip peripherals, except for the software interrupt (SWI), which is programmable by the user. The ARM7TDMI CPU core recognizes interrupts as one of two types only: a normal interrupt request (IRQ) or a fast interrupt request (FIQ). All the interrupts can be masked separately.

The control and configuration of the interrupt system are managed through a number of interrupt related registers. The bits in each IRQ and FIQ register represent the same interrupt source, as described in Tab l e 65 .

Each ADuC706x contains a vectored interrupt controller (VIC) that supports nested interrupts up to eight levels. The VIC also allows the programmer to assign priority levels to all interrupt sources. Interrupt nesting needs to be enabled by setting the ENIRQN bit in the IRQCONN register. A number of extra MMRs are used when the full vectored interrupt controller is enabled.

Immediately save IRQSTA/FIQSTA upon entering the interrupt service routine (ISR) to ensure that all valid interrupt sources are serviced.

IRQ

The IRQ is the exception signal to enter the IRQ mode of the processor. It services general-purpose interrupt handling of internal and external events.

All 32 bits are logically OR’ed to create a single IRQ signal to the ARM7TDMI core. The four 32-bit registers dedicated to IRQ are described in the following sections.

IRQSIG

IRQSIG reflects the status of the different IRQ sources. If a peripheral generates an IRQ signal, the corresponding bit in the IRQSIG is set; otherwise, it is cleared. The IRQSIG bits clear when the interrupt in the particular peripheral is cleared. All IRQ sources can be masked in the IRQEN MMR. IRQSIG is read only.

IRQSIG Register

Name: IRQSIG

Address: 0xFFFF0004

Default value: Undefined

Access: Read only

Table 65. IRQ/FIQ MMR Bit Designations

Bit Description Comments

All interrupts OR’ed (FIQ only)

1 Software interrupt

2 Undefined This bit is not used 3 Timer0 General-Purpose Timer0 4

Timer1 or wake-up timer

Timer2 or watchdog

timer 6 Timer3 or STI timer General-Purpose Timer3 7 Undefined This bit is not used 8 Undefined This bit is not used 9 Undefined This bit is not used 10 ADC ADC interrupt source bit 11 UART UART interrupt source bit 12 SPI SPI interrupt source bit 13 XIRQ0 (GPIO IRQ0) External Interrupt 0 14 XIRQ1 (GPIO IRQ1) External Interrupt 1 15 I2C master IRQ I2C master interrupt source bit 16 I2C slave IRQ I2C slave interrupt source bit 17 PWM PWM trip interrupt source bit 18 XIRQ2 (GPIO IRQ2) External Interrupt 2 19 XIRQ3 (GPIO IRQ3) External Interrupt 3

This bit is set if any FIQ is active

User programmable interrupt source

General-Purpose Timer1 or wake-up timer

General-Purpose Timer2 or watchdog timer

IRQEN

IRQEN provides the value of the current enable mask. When a bit is set to 1, the corresponding source request is enabled to create an IRQ exception. The IRQEN register cannot be used to disable an interrupt. Clear to 0 has no effect.

IRQEN Register

Name: IRQEN

Address: 0xFFFF0008

Default value: 0x00000000

Access: Read and write

IRQCLR

IRQCLR is a write-only register that allows the IRQEN register to clear to mask an interrupt source. Each bit that is set to 1 clears the corresponding bit in the IRQEN register without affecting the remaining bits. The pair of registers, IRQEN and IRQCLR, allows independent manipulation of the enable mask without requiring an atomic read-modify-write. Clear to 0 has no effect.

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ADuC7060/ADuC7061

IRQCLR Register

Name: IRQCLR

FIQSIG Register

Name: FIQSIG

Address: 0xFFFF000C

Default value: 0x00000000

Access: Write only

IRQSTA

IRQSTA is a read-only register that provides the current enabled IRQ source status (effectively a logic AND of the IRQSIG and IRQEN bits). When set to 1, that source generates an active IRQ request to the ARM7TDMI core. There is no priority encoder or interrupt vector generation. This function is implemented in software in a common interrupt handler routine.

IRQSTA Register

Name: IRQSTA

Address: 0xFFFF0000

Default value: 0x00000000

Access: Read only

FAST INTERRUPT REQUEST (FIQ)

The fast interrupt request (FIQ) is the exception signal to enter the FIQ mode of the processor. It is provided to service data transfer or communication channel tasks with low latency. The FIQ interface is identical to the IRQ interface and provides the second level interrupt (highest priority). Four 32-bit registers are dedicated to FIQ: FIQSIG, FIQEN, FIQCLR, and FIQSTA.

Bit 31 to Bit 1 of FIQSTA are logically OR’ed to create the FIQ signal to the core and to Bit 0 of both the FIQ and IRQ registers (FIQ source).

The logic for FIQEN and FIQCLR does not allow an interrupt source to be enabled in both IRQ and FIQ masks. A bit set to 1 in FIQEN clears, as a side effect, the same bit in IRQEN. Likewise, a bit set to 1 in IRQEN clears, as a side effect, the same bit in FIQEN. An interrupt source can be disabled in both IRQEN and FIQEN masks.

FIQSIG

FIQSIG reflects the status of the different FIQ sources. If a peripheral generates an FIQ signal, the corresponding bit in the FIQSIG is set; otherwise, it is cleared. The FIQSIG bits are cleared when the interrupt in the particular peripheral is cleared. All FIQ sources can be masked in the FIQEN MMR. FIQSIG is read only.

Address: 0xFFFF0104

Default value: Undefined

Access: Read only

FIQEN

FIQEN provides the value of the current enable mask. When a bit is set to 1, the corresponding source request is enabled to create an FIQ exception. When a bit is set to 0, the corresponding source request is disabled or masked, which does not create an FIQ exception. The FIQEN register cannot be used to disable an interrupt.

FIQEN Register

Name: FIQEN

Address: 0xFFFF0108

Default value: 0x00000000

Access: Read and write

FIQCLR

FIQCLR is a write-only register that allows the FIQEN register to clear in order to mask an interrupt source. Each bit that is set to 1 clears the corresponding bit in the FIQEN register without affecting the remaining bits. The pair of registers, FIQEN and FIQCLR, allows independent manipulation of the enable mask without requiring an atomic read-modify-write.

FIQCLR Register

Name: FIQCLR

Address: 0xFFFF010C

Default value: 0x00000000

Access: Write only

FIQSTA

FIQSTA is a read-only register that provides the current enabled FIQ source status (effectively a logic AND of the FIQSIG and FIQEN bits). When set to 1, that source generates an active FIQ request to the ARM7TDMI core. There is no priority encoder or interrupt vector generation. This function is implemented in software in a common interrupt handler routine.

Rev. C | Page 60 of 108

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ADuC7060/ADuC7061

FIQSTA Register

Name: FIQSTA

Address: 0xFFFF0100

• Vectored interrupts—allows a user to define separate

interrupt service routine addresses for every interrupt source. This is achieved by using the IRQBASE and IRQVEC registers.

Default value: 0x00000000

Access: Read only

PROGRAMMED INTERRUPTS

Because the programmed interrupts are not maskable, they are controlled by another register (SWICFG) that writes into both IRQSTA and IRQSIG registers and/or the FIQSTA and FIQSIG registers at the same time.

SWICFG

SWICFG is a 32-bit register dedicated to software interrupt, described in Ta bl e 66 . This MMR allows control of a programmed source interrupt.

SWICFG Register

Name: SWICFG

Address: 0xFFFF0010

Default value: 0x00000000

Access: Write only

Table 66. SWICFG MMR Bit Designations

Bit Description

31:3 Reserved. 2

0 Reserved.

Any interrupt signal must be active for at least the minimum interrupt latency time to be detected by the interrupt controller and to be detected by the user in the IRQSTA/FIQSTA register.

Programmed interrupt FIQ. Setting/clearing this bit corresponds to setting/clearing Bit 1 of FIQSTA and FIQSIG.

Programmed interrupt IRQ. Setting/clearing this bit corresponds to setting/clearing Bit 1 of IRQSTA and IRQSIG.

VECTORED INTERRUPT CONTROLLER (VIC)

Each ADuC706x incorporates an enhanced interrupt control system or vectored interrupt controller. The vectored interrupt controller for IRQ interrupt sources is enabled by setting Bit 0 of the IRQCONN register. Similarly, Bit 1 of IRQCONN enables the vectored interrupt controller for the FIQ interrupt sources. The vectored interrupt controller provides the following enhancements to the standard IRQ/FIQ interrupts:

• IRQ/FIQ interrupts—can be nested up to eight levels

depending on the priority settings. An FIQ still has a higher priority than an IRQ. Therefore, if the VIC is enabled for both the FIQ and IRQ and prioritization is maximized, it is possible to have 16 separate interrupt levels.

• Programmable interrupt priorities—using the IRQP0 to

IRQP2 registers, an interrupt source can be assigned an interrupt priority level value from 0 to 7.

VIC MMRS

IRQBASE

The vector base register, IRQBASE, is used to point to the start address of memory used to store 32 pointer addresses. These pointer addresses are the addresses of the individual interrupt service routines.

IRQBASE Register

Name: IRQBASE

Address: 0xFFFF0014

Default value: 0x00000000

Access: Read and write

Table 67. IRQBASE MMR Bit Designations

Bit Access Initial Value Description

31:16 Read only Reserved Always read as 0. 15:0 R/W 0 Vector base address.

IRQVEC

The IRQ interrupt vector register, IRQVEC, points to a memory address containing a pointer to the interrupt service routine of the currently active IRQ. This register should be read only when an IRQ occurs and IRQ interrupt nesting has been enabled by setting Bit 0 of the IRQCONN register.

IRQVEC Register

Name: IRQVEC

Address: 0xFFFF001C

Default value: 0x00000000

Access: Read only

Rev. C | Page 61 of 108

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ADuC7060/ADuC7061

Table 68. IRQVEC MMR Bit Designations

Initial

Bit Access

31:23

22:7

6:2

1:0 Reserved 0 Reserved bits.

Read only

Priority Registers

The interrupt priority registers, IRQP0, IRQP1, and IRQP2, allow each interrupt source to have its priority level configured for a level between 0 and 7. Level 0 is the highest priority level.

IRQP0 Register

Name: IRQP0

Address: 0xFFFF0020

Default value: 0x00000000

Access: Read and write

Table 69. IRQP0 MMR Bit Designations

Bit Name Description

31:27 Reserved Reserved bits. 26:24 T3PI

23 Reserved Reserved bit. 22:20 T2PI

19 Reserved Reserved bit. 18:16 T1PI

15 Reserved Reserved bit. 14:12 T0PI

11:7 Reserved Reserved bits. 6:4 SWINTP

3:0 Reserved Interrupt 0 cannot be prioritized.

Value Description

0 Always read as 0.

0 IRQBASE register value.

A priority level of 0 to 7 can be set for Timer3.

A priority level of 0 to 7 can be set for Timer2.

A priority level of 0 to 7 can be set for Timer1.

A priority level of 0 to 7 can be set for Timer0.

A priority level of 0 to 7 can be set for the software interrupt source.

Highest priority IRQ source. This is a value between 0 to 19 representing the possible interrupt sources. For example, if the highest currently active IRQ is Timer1, then these bits are [01000].

IRQP1 Register

Name: IRQP1

Address: 0xFFFF0024

Default value: 0x00000000

Access: Read and write

Table 70. IRQP1 MMR Bit Designations

Bit Name Description

31 Reserved Reserved bit. 30:28 I2CMPI

27 Reserved Reserved bit. 26:24 IRQ1PI A priority level of 0 to 7 can be set for IRQ1. 23 Reserved Reserved bit. 22:20 IRQ0PI A priority level of 0 to 7 can be set for IRQ0. 19 Reserved Reserved bit. 18:16 SPIMPI

15 Reserved Reserved bit. 14:12 UARTPI A priority level of 0 to 7 can be set for UART. 11 Reserved Reserved bit. 10:8 ADCPI

7:0 Reserved Reserved bits.

A priority level of 0 to 7 can be set for I master.

A priority level of 0 to 7 can be set for SPI master.

A priority level of 0 to 7 can be set for the ADC interrupt source.

IRQP2 Register

Name: IRQP2

Address: 0xFFFF0028

Default value: 0x00000000

Access: Read and write

Table 71. IRQP2 MMR Bit Designations

Bit Name Description

31:15 Reserved Reserved bit. 14:12 IRQ3PI A priority level of 0 to 7 can be set for IRQ3. 11 Reserved Reserved bit. 10:8 IRQ2PI A priority level of 0 to 7 can be set for IRQ2. 7 Reserved Reserved bit. 6:4 SPISPI

3 Reserved Reserved bit. 2:0 I2CSPI

A priority level of 0 to 7 can be set for SPI slave.

A priority level of 0 to 7 can be set for I slave.

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ADuC7060/ADuC7061

IRQCONN

The IRQCONN register is the IRQ and FIQ control register. It contains two active bits: the first to enable nesting and prioritization of IRQ interrupts, and the other to enable nesting and prioritization of FIQ interrupts.

If these bits are cleared, FIQs and IRQs can still be used, but it is not possible to nest IRQs or FIQs. Neither is it possible to set an interrupt source priority level. In this default state, an FIQ does have a higher priority than an IRQ.

IRQCONN Register

Name: IRQCONN

Address: 0xFFFF0030

Default value: 0x00000000

Access: Read and write

Table 72. IRQCONN MMR Bit Designations

Bit Name Description

31:2 Reserved

1 ENFIQN

0 ENIRQN

These bits are reserved and should not be written to.

Setting this bit to 1 enables nesting of FIQ interrupts. Clearing this bit means no nesting or prioritization of FIQs is allowed.

Setting this bit to 1 enables nesting of IRQ interrupts. Clearing this bit means no nesting or prioritization of IRQs is allowed.

IRQSTAN Register

Name: IRQSTAN

Address: 0xFFFF003C

Default value: 0x00000000

Access: Read and write

Table 73. IRQSTAN MMR Bit Designations

Bit Name Description

31:8 Reserved

7:0

These bits are reserved and should not be written to.

Setting this bit to 1 enables nesting of FIQ interrupts. Clearing this bit means no nesting or prioritization of FIQs is allowed.

FIQVEC

The FIQ interrupt vector register, FIQVEC, points to a memory address containing a pointer to the interrupt service routine of the currently active FIQ. This register should be read only when an FIQ occurs and FIQ interrupt nesting has been enabled by setting Bit 1 of the IRQCONN register.

FIQVEC Register

Name: FIQVEC

Address: 0xFFFF011C

Default value: 0x00000000

IRQSTAN

If IRQCONN[0] is asserted and IRQVEC is read, then one of these bits is asserted. The bit that asserts depends on the priority of the IRQ. If the IRQ is of Priority 0, then Bit 0 asserts; Priority 1, then Bit 1 asserts; and so forth. When a bit is set in this register, all interrupts of that priority and lower are blocked.

To clear a bit in this register, all bits of a higher priority must be cleared first. It is possible to clear only one bit at a time. For example, if this register is set to 0x09, writing 0xFF changes the register to 0x08, and writing 0xFF a second time changes the register to 0x00.

Access: Read only

Table 74. FIQVEC MMR Bit Designations

Initial

Bit Access

31:23 Read only 0 Always read as 0. 22:7 Read only 0 IRQBASE register value. 6:2 0

1:0 Reserved 0 Reserved bits.

Value Description

Highest priority FIQ source. This is a value between 0 to 19 that represents the possible interrupt sources. For example, if the highest currently active FIQ is Timer1, then these bits are [01000].

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FIQSTAN

If IRQCONN[1] is asserted and FIQVEC is read, then one of these bits asserts. The bit that asserts depends on the priority of the FIQ. If the FIQ is of Priority 0, Bit 0 asserts; Priority 1, Bit 1 asserts; and so forth.

When a bit is set in this register, all interrupts of that priority and lower are blocked.

To clear a bit in this register, all bits of a higher priority must be cleared first. It is possible to clear only one bit as a time. For example, if this register is set to 0x09, writing 0xFF changes the register to 0x08, and writing 0xFF a second time changes the register to 0x00.

FIQSTAN Register

Name: FIQSTAN

Address: 0xFFFF013C

Default value: 0x00000000

Access: Read and write

External Interrupts (IRQ0 to IRQ3)

The ADuC706x provides up to four external interrupt sources. These external interrupts can be individually configured as level triggered or rising/falling edge triggered.

To enable the external interrupt source, the appropriate bit must first be set in the FIQEN or IRQEN register. To select the required edge or level to trigger on, the IRQCONE register must be appropriately configured.

To properly clear an edge based external IRQ interrupt, set the appropriate bit in the IRQCLRE register.

IRQCONE Register

Name: IRQCONE

Address: 0xFFFF0034

Default value: 0x00000000

Access: Read and write

Table 75. FIQSTAN MMR Bit Designations

Bit Name Description

31:8 Reserved

7:0

These bits are reserved and should not be written to.

Setting this bit to 1 enables nesting of FIQ interrupts. Clearing this bit means no nesting or prioritization of FIQs is allowed.

Table 76. IRQCONE MMR Bit Designations

Bit Name Description

31:8 Reserved These bits are reserved and should not be written to. 7:6 IRQ3SRC[1:0] [11] = External IRQ3 triggers on falling edge. [10] = External IRQ3 triggers on rising edge. [01] = External IRQ3 triggers on low level. [00] = External IRQ3 triggers on high level. 5:4 IRQ2SRC[1:0] [11] = External IRQ2 triggers on falling edge. [10] = External IRQ2 triggers on rising edge. [01] = External IRQ2 triggers on low level. [00] = External IRQ2 triggers on high level. 3:2 IRQ1SRC[1:0] [11] = External IRQ1 triggers on falling edge. [10] = External IRQ1 triggers on rising edge. [01] = External IRQ1 triggers on low level. [00] = External IRQ1 triggers on high level. 1:0 IRQ0SRC[1:0] [11] = External IRQ0 triggers on falling edge. [10] = External IRQ0 triggers on rising edge. [01] = External IRQ0 triggers on low level. [00] = External IRQ0 triggers on high level.

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IRQCLRE Register

Name: IRQCLRE

Address: 0xFFFF0038

Default value: 0x00000000

Access: Read and write

Table 77. IRQCLRE MMR Bit Designations

Bit Name Description

31:20 Reserved

19 IRQ3CLRI

18 IRQ2CLRI

17:15 Reserved

14 IRQ1CLRI

13 IRQ0CLRI

12:0 Reserved

These bits are reserved and should not be written to.

A 1 must be written to this bit in the IRQ3 interrupt service routine to clear an edge triggered IRQ3 interrupt.

A 1 must be written to this bit in the IRQ2 interrupt service routine to clear an edge triggered IRQ2 interrupt.

These bits are reserved and should not be written to.

A 1 must be written to this bit in the IRQ1 interrupt service routine to clear an edge triggered IRQ1 interrupt.

A 1 must be written to this bit in the IRQ0 interrupt service routine to clear an edge triggered IRQ0 interrupt.

These bits are reserved and should not be written to.

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TIMERS

The ADuC706x features four general-purpose timer/counters.

• Timer0

• Timer1 or wake-up timer

• Timer2 or watchdog timer

• Timer3

The four timers in their normal mode of operation can be either free running or periodic.

In free running mode, the counter decrements/increments from the maximum or minimum value until zero/full scale and starts again at the maximum or minimum value.

In periodic mode, the counter decrements/increments from the value in the load register (TxLD MMR) until zero/full scale and starts again at the value stored in the load register. Note that the TxLD MMR should be configured before the TxCON MMR.

The value of a counter can be read at any time by accessing its value register (TxVAL). Timers are started by writing in the control register of the corresponding timer (TxCON).

In normal mode, an IRQ is generated each time that the value of the counter reaches zero (if counting down) or full scale (if counting up). An IRQ can be cleared by writing any value to the clear register of the particular timer (TxCLRI).

Table 78. Timer Event Capture

Bit Description

0 Reserved 1 Timer0 2 Timer1 or wake-up timer 3 Timer2 or watchdog timer 4 Timer3 5 Reserved 6 Reserved 7 Reserved 8 ADC 9 UART 10 SPI 11 XIRQ0 12 XIRQ1 13 I2C master 14 I2C slave 15 PWM 16 XIRQ2 (GPIO IRQ2) 17 XIRQ3 (GPIO IRQ3)

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TIMER0

Timer0 is a 32-bit, general-purpose timer, count down or count up, with a programmable prescaler. The prescaler source can be the low power 32.768 kHz oscillator, the core clock, or from one of two external GPIOs. This source can be scaled by a factor of 1, 16, 256, or 32,768. This gives a minimum resolution of 97.66 ns with a prescaler of 1 (ignoring the external GPIOs).

The counter can be formatted as a standard 32-bit value or as hours:minutes:seconds:hundredths.

Timer0 has a capture register (T0CAP) that is triggered by a selected IRQ source initial assertion. When triggered, the current timer value is copied to T0CAP, and the timer continues to run. Use this feature to determine the assertion of an event with increased accuracy. Note that only peripherals that have their IRQ source enabled can be used with the timer capture feature.

The Timer0 interface consists of five MMRS: T0LD, T0VAL, T0CAP, T0CLRI, and T0CON.

• T0LD, T0VAL, and T0CAP are 32-bit registers and hold

32-bit, unsigned integers of which T0VAL and T0CAP are read only.

• T0CLRI is an 8-bit register and writing any value to this

• T0CON is the configuration MMR, which is described in

Tabl e 79 .

Timer0 features a postscaler that allows the user to count between 1 and 256 the number of Timer0 timeouts. To activate the postscaler, the user sets Bit 18 and writes the desired number to count into Bits[24:31] of T0CON. When that number of timeouts is reached, Timer0 can generate an interrupt if T0CON[18] is set.

Note that, if the part is in a low power mode and Timer0 is clocked from the GPIO or low power oscillator source, Timer0 continues to operate.

Timer0 reloads the value from T0LD when Timer0 overflows.

Timer0 Load Registers

Name: T0LD

Address: 0xFFFF0320

Default value: 0x00000000

Access: Read and write

Function: T0LD is a 32-bit register that holds the 32-bit

value that is loaded into the counter.

Timer0 Clear Register

Name: T0CLRI

Address: 0xFFFF032C

Access: Write only

Function: This 8-bit, write-only MMR is written

(with any value) by user code to clear the interrupt.

Timer0 Value Register

Name: T0VAL

Address: 0xFFFF0324

Default value: 0xFFFFFFFF

Access: Read only

Function: T0VAL is a 32-bit register that holds the

current value of Timer0.

32-BIT LO AD

2.768kHz OSCI LLATO R

CORE CLOCK

FREQUENCY/CD

CORE CLOCK

FREQUENCY

GPIO

PRESCALER

1, 16, 256, O R 32,768

IRQ[31:0]

Figure 23. Timer0 Block Diagram

32-BIT

UP/DOWN COUNT ER

TIMER0

CAPTURE

Rev. C | Page 67 of 108

VALUE

8-BIT

POSTSCALER

TIMER0 IRQ

07079-017

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Timer0 Capture Register

Name: T0CAP

Address: 0xFFFF0330

Default value: 0x00000000

Access: Read only

Function: This 32-bit register holds the 32-bit value captured by an enabled IRQ event.

Timer0 Control Register

Name: T0CON

Address: 0xFFFF0328

Default value: 0x01000000

Access: Read and write

Function: This 32-bit MMR configures the mode of operation of Timer0.

Table 79. T0CON MMR Bit Designations

Bit Name Description

31:24 T0PVAL 8-bit postscaler. By writing to these eight bits, a value is written to the postscaler. Writing 0 is interpreted as a 1. By reading these eight bits, the current value of the counter is read. 23 T0PEN Timer0 enable postscaler. Set to enable the Timer0 postscaler. If enabled, interrupts are generated after T0CON[31:24] periods

as defined by T0LD. Cleared to disable the Timer0 postscaler. 22:20 Reserved. These bits are reserved and should be written as 0 by user code. 19 T0PCF Postscaler compare flag; read only. Set if the number of Timer0 overflows is equal to the number written

to the postscaler. 18 T0SRCI Timer0 interrupt source. Set to select interrupt generation from the postscaler counter. Cleared to select interrupt generation directly from Timer0. 17 T0CAPEN Event enable bit. Set by user to enable time capture of an event. Cleared by user to disable time capture of an event. 16:12 T0CAPSEL Event Select Bits[17:0]. The events are described in Table 7 8. 11 Reserved bit. 10:9

8 T0DIR Count up. Set by user for Timer0 to count up. Cleared by user for Timer0 to count down (default). 7 T0EN Timer0 enable bit. Set by user to enable Timer0. Cleared by user to disable Timer0 (default). 6 T0MOD Timer0 mode. Set by user to operate in periodic mode. Cleared by user to operate in free running mode (default).

T0CLKSEL Clock select.

[00] = 32.768 kHz. [01] = 10.24 MHz/CD. [10] = 10.24 MHz. [11] = P1.0.

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Bit Name Description

5:4

3:0

TIMER1 OR WAKE-UP TIMER

Timer1 is a 32-bit wake-up timer, count down or count up, with a programmable prescaler. The prescaler is clocked directly from one of four clock sources, namely, the core clock (which is the default selection), the low power 32.768 kHz oscillators, external

32.768 kHz watch crystal, or the precision 32.768 kHz oscillator. The selected clock source can be scaled by a factor of 1, 16, 256, or 32,768. The wake-up timer continues to run when the core clock is disabled. This gives a minimum resolution of 97.66 ns when operating at CD zero, the core is operating at 10.24 MHz, and with a prescaler of 1 (ignoring the external GPIOs).

The counter can be formatted as a plain 32-bit value or as hours:minutes:seconds:hundredths.

Timer1 reloads the value from T1LD either when Timer1 overflows or immediately when T1LD is written.

The Timer1 interface consists of four MMRS.

• T1LD and T1VAL are 32-bit registers and hold 32-bit,

• T1CLRI is an 8-bit register. Writing any value to this

• T1CON is the configuration MMR, described in Ta bl e 80 .

T0FORMAT Format.

[00] = binary (default). [01] = reserved. [10] = hours:minutes:seconds:hundredths (23 hours to 0 hours). [11] = hours:minutes:seconds:hundredths (255 hours to 0 hours).

T0SCALE Prescaler.

[0000] = source clock/1 (default). [0100] = source clock/16. [1000] = source clock/256. [1111] = source clock/32,768. Note that all other values are undefined.

unsigned integers. T1VAL is read only.

Timer1 Load Registers

Name: T1LD

Address: 0xFFFF0340

Default value: 0x00000000

Access: Read and write

Function: T1LD is a 32-bit register that holds the 32-bit

value that is loaded into the counter.

Timer1 Clear Register

Name: T1CLRI

Address: 0xFFFF034C

Access: Write only

Function: This 8-bit, write-only MMR is written (with

any value) by user code to clear the interrupt.

Timer1 Value Register

Name: T1VAL

Address: 0xFFFF0344

Default value: 0xFFFFFFFF

Access: Read only

Function: T1VAL is a 32-bit register that holds the

Rev. C | Page 69 of 108

current value of Timer1.

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32.768kHz OSCI LLATO R

CORE CLOCK

FREQUENCY/CD

CORE

CLOCK

EXTERNAL 32.768kHz

WATCH CRY STAL

Timer1 Control Register

Name: T1CON

Address: 0xFFFF0348

Default value: 0x0000

Access: Read and write

Function: This 16-bit MMR configures the mode of operation of Timer1.

Table 80. T1CON MMR Bit Designations

Bit Name Description

15:11 Reserved.

T1CLKSEL Clock source select. 10: 9

[00] = 32.768 kHz oscillator. [01] = 10.24 MHz/CD. [10] = XTALI.

[11] = 10.24 MHz. 8 T1DIR Count up. Set by user for Timer1 to count up.

Cleared by user for Timer1 to count down (default). 7 T1EN Timer1 enable bit. Set by user to enable Timer1.

Cleared by user to disable Timer1 (default). 6 T1MOD Timer1 mode. Set by user to operate in periodic mode.

5:4

3:0

T1FORMAT Format.

T1SCALE Prescaler.

Cleared by user to operate in free running mode (default).

[00] = binary (default).

[01] = reserved.

[10] = hours:minutes:seconds:hundredths (23 hours to 0 hours). This is only valid with a 32 kHz clock.

[11] = hours:minutes:seconds:hundredths (255 hours to 0 hours). This is only valid with a 32 kHz clock.

[0000] = source clock/1 (default).

[0100] = source clock/16.

[1000] = source clock/256. This setting should be used in conjunction with Timer1 in the format

hours:minutes:seconds:hundredths. See Format 10 and Format 11 listed with Bits[5:4] in this table (Table 80 ).

[1111] = source clock/32,768.

PRESCALER

1, 16, 256, O R 32,768

Figure 24. Timer1 Block Diagram

UP/DOWN COUNT ER

32-BIT LO AD

32-BIT

TIMER1

VALUE

TIMER1 IRQ

7079-018

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TIMER2 OR WATCHDOG TIMER

Timer2 has two modes of operation, normal mode and watchdog mode. The watchdog timer is used to recover from an illegal software state. When enabled, it requires periodic servicing to prevent it from forcing a reset of the processor.

Timer2 reloads the value from T2LD either when Timer2 overflows or immediately when T2CLRI is written.

Normal Mode

Timer2 in normal mode is identical to Timer0 in the 16-bit mode of operation, except for the clock source. The clock source is the low power, 32.768 kHz oscillator scalable by a factor of 1, 16, or 256.

Watchdog Mode

Watchdog mode is entered by setting T2CON[Bit 5]. Timer2 decrements from the timeout value present in the T2LD register until zero. The maximum timeout is 512 seconds, using a maximum prescaler/256 and full scale in T2LD.

User software should not configure a timeout period of less than 30 ms. This is to avoid any conflict with Flash/EE memory page erase cycles that require 20 ms to complete a single page erase cycle and kernel execution.

If T2VAL reaches 0, a reset or an interrupt occurs, depending on T2CON[1]. To avoid a reset or an interrupt event, any value must be written to T2CLRI before T2VAL reaches zero. This reloads the counter with T2LD and begins a new timeout period.

When watchdog mode is entered, T2LD and T2CON are write protected. These two registers cannot be modified until a power-on reset event resets the watchdog timer. After any other reset event, the watchdog timer continues to count. To avoid an infinite loop of watchdog resets, configure the watchdog timer in the initial lines of user code. User software should configure a minimum timeout period of 30 ms only.

Timer2 halts automatically during JTAG debug access and only recommences counting after JTAG relinquishes control of the ARM7 core. By default, Timer2 continues to count during power-down. To disable this, set Bit 0 in T2CON. It is recommended that the default value be used, that is, that the watchdog timer continues to count during power-down.

Timer2 Interface

The Timer2 interface consists of four MMRs.

• T2CON is the configuration MMR, described in (Tab le 81).

• T2LD and T2VAL are 16-bit registers (Bit 0 to Bit 15) and

hold 16-bit, unsigned integers. T2VAL is read only.

• T2CLRI is an 8-bit register. Writing any value to this

Timer2 Load Register

Name: T2LD

Address: 0xFFFF0360

Default value: 0x0040

Access: Read and write

Function: This 16-bit MMR holds the Timer2

reload value.

Timer2 Clear Register

Name: T2CLRI

Address: 0xFFFF036C

Access: Write only

Function: This 8-bit, write-only MMR is written (with

any value) by user code to refresh (reload) Timer2 in watchdog mode to prevent a watchdog timer reset event.

Timer2 Value Register

Name: T2VAL

Address: 0xFFFF0364

Default value: 0x0040

Access: Read only

Function: This 16-bit, read-only MMR holds the

current Timer2 count value.

16-BIT LO AD

32.768kHz

PRESCALER

1, 16, 256

Figure 25. Timer2 Block Diagram

UP/DOWN COUNT ER

16-BIT

TIMER2

VALUE

WATCHDOG RESET

TIMER2 IRQ

07079-019

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Timer2 Control Register

Name: T2CON

Address: 0xFFFF0368

Default value: 0x0000

Access: Read and write

Function: This 16-bit MMR configures the mode of operation of Timer2, as described in detail in Ta b le 8 1 .

Table 81. T2CON MMR Bit Designations

Bit Name Description

15:9 Reserved. These bits are reserved and should be written as 0 by user code. 8 T2DIR Count up/count down enable. Set by user code to configure Timer2 to count up. Cleared by user code to configure Timer2 to count down. 7 T2EN Timer2 enable. Set by user code to enable Timer2. Cleared by user code to disable Timer2. 6 T2MOD Timer2 operating mode. Set by user code to configure Timer2 to operate in periodic mode. Cleared by user to configure Timer2 to operate in free running mode. 5 WDOGMDEN Watchdog timer mode enable. Set by user code to enable watchdog mode. Cleared by user code to disable watchdog mode. 4 Reserved. This bit is reserved and should be written as 0 by user code. 3:2 T2SCALE Timer2 clock (32.768 kHz) prescaler. 00 = 32.768 kHz (default). 01 = source clock/16. 10 = source clock/256. 11 = reserved. 1 WDOGENI Watchdog timer IRQ enable. Set by user code to produce an IRQ instead of a reset when the watchdog reaches 0. Cleared by user code to disable the IRQ option. 0 T2PDOFF Stop Timer2 when power-down is enabled. Set by user code to stop Timer2 when the peripherals are powered down using Bit 4 in the POWCON0 MMR.

Cleared by user code to enable Timer2 when the peripherals are powered down using Bit 4 in the POWCON0 MMR.

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TIMER3

Timer3 is a general-purpose, 16-bit, count up/count down timer with a programmable prescaler. Timer3 can be clocked from the core clock or the low power 32.768 kHz oscillator with a prescaler of 1, 16, 256, or 32,768.

Timer3 has a capture register (T3CAP) that can be triggered by a selected IRQ source initial assertion. Once triggered, the current timer value is copied to T3CAP, and the timer continues to run. This feature can be used to determine the assertion of an event with increased accuracy.

The Timer3 interface consists of five MMRs.

• T3LD, T3VAL, and T3CAP are 16-bit registers and hold

16-bit, unsigned integers. T3VAL and T3CAP are read only.

• T3CLRI is an 8-bit register. Writing any value to this

• T3CON is the configuration MMR, described in Ta bl e 82 .

Timer3 Load Registers

Name: T3LD

Address: 0xFFFF0380

Default value: 0x0000

Access: Read and write

Function: T3LD is a 16-bit register that holds the

16-bit value that is loaded into the counter.

Timer3 Clear Register

Name: T3CLRI

Timer3 Value Register

Name: T3VAL

Address: 0xFFFF0384

Default value: 0xFFFF

Access: Read only

Function: T3VAL is a 16-bit register that holds the

current value of Timer3.

Time3 Capture Register

Name: T3CAP

Address: 0xFFFF0390

Default value: 0x0000

Access: Read only

Function: This is a 16-bit register that holds the 16-bit

value captured by an enabled IRQ event.

Timer3 Control Register

Name: T3CON

Address: 0xFFFF0388

Default value: 0x00000000

Access: Read and write

Function: This 32-bit MMR configures the mode of

operation of Timer3.

Address: 0xFFFF038C

Access: Write only

Function: This 8-bit, write-only MMR is written (with

any value) by user code to clear the interrupt.

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Table 82. T3CON MMR Bit Designations

Bit Name Description

31:18 Reserved. 17 T3CAPEN Event enable bit. Set by user to enable time capture of an event. Cleared by user to disable time capture of an event. 16:12 T3CAPSEL Event select range, 0 to 17. The events are described in Table 78. 11 Reserved. 10:9

8 T3DIR Count up. Set by user for Timer3 to count up. Cleared by user for Timer3 to count down (default). 7 T3EN Timer3 enable bit. Set by user to enable Timer3. Cleared by user to disable Timer3 (default). 6 T3MOD Timer3 mode. Set by user to operate in periodic mode. Cleared by user to operate in free running mode (default mode). 5:4 Reserved. 3:0

T3CLKSEL Clock select. [00] = 32.768 kHz oscillator. [01] = 10.24 MHz/CD. [10] = 10.24 MHz. [11] = reserved.

T3SCALE Prescaler. [0000] = source clock/1 (default). [0100] = source clock/16. [1000] = source clock/256. [1111] = source clock/32,768.

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PULSE-WIDTH MODULATOR

PULSE-WIDTH MODULATOR GENERAL OVERVIEW

Each ADuC706x integrates a 6-channel pulse-width modulator (PWM) interface. The PWM outputs can be configured to drive an H-bridge or can be used as standard PWM outputs. On power-up, the PWM outputs default to H-bridge mode. This ensures that the motor is turned off by default. In standard PWM mode, the outputs are arranged as three pairs of PWM pins. Users have control over the period of each pair of outputs and over the duty cycle of each individual output.

In all modes, the PWMxCOMx MMRs control the point at which the PWM outputs change state. An example of the first pair of PWM outputs (PWM0 and PWM1) is shown in

HIGH SIDE

(PWM0)

LOW SIDE

(PWM1)

Figure 26.

Table 83. PWM MMRs

MMR Name Description

PWMCON PWM control. PWM0COM0

PWM0COM1

PWM0COM2

PWM0LEN

PWM1COM0

PWM1COM1

PWM1COM2

PWM1LEN

PWM2COM0

PWM2COM1

PWM2COM2

PWM2LEN

PWMCLRI PWM interrupt clear.

Compare Register 0 for PWM Output 0 and PWM Output 1.

Compare Register 1 for PWM Output 0 and PWM Output 1.

Compare Register 2 for PWM Output 0 and PWM Output 1.

Frequency control for PWM Output 0 and PWM Output 1.

Compare Register 0 for PWM Output 2 and PWM Output 3.

Compare Register 1 for PWM Output 2 and PWM Output 3.

Compare Register 2 for PWM Output 2 and PWM Output 3.

Frequency control for PWM Output 2 and PWM Output 3.

Compare Register 0 for PWM Output 4 and PWM Output 5.

Compare Register 1 for PWM Output 4 and PWM Output 5.

Compare Register 2 for PWM Output 4 and PWM Output 5.

Frequency control for PWM Output 4 and PWM Output 5.

PWM0COM2

PWM0COM1

PWM0COM0

PWM0LEN

Figure 26. PWM Timing

7079-020

The PWM clock is selectable via PWMCON with one of the following values: UCLK divided by 2, 4, 8, 16, 32, 64, 128, or

256. The length of a PWM period is defined by PWMxLEN.

The PWM waveforms are set by the count value of the 16-bit timer and the compare registers contents, as shown with the PWM0 and PWM1 waveforms in

Figure 26.

The low-side waveform, PWM1, goes high when the timer count reaches PWM0LEN, and it goes low when the timer count reaches the value held in PWM0COM2 or when the high-side waveform (PWM0) goes low.

The high-side waveform, PWM0, goes high when the timer count reaches the value held in PWM0COM0, and it goes low when the timer count reaches the value held in PWM0COM1.

PWMCON Control Register

Name: PWMCON

Address: 0xFFFF0F80

Default value: 0x0012

Access: Read and write

Function: This is a 16-bit MMR that configures the

PWM outputs.

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Table 84. PWMCON MMR Bit Designations

Bit Name Description

15 Reserved This bit is reserved. Do not write to this bit. 14 Sync Enables PWM synchronization.

Cleared by user to ignore transitions on the P1.2/SYNC pin. 13 PWM5INV Set to 1 by user to invert PWM5. Cleared by user to use PWM5 in normal mode. 12 PWM3INV Set to 1 by user to invert PWM3. Cleared by user to use PWM3 in normal mode. 11 PWM1INV Set to 1 by user to invert PWM1. Cleared by user to use PWM1 in normal mode. 10 PWMTRIP

Cleared by user to disable the PWMTRIP interrupt. 9 ENA If HOFF = 0 and HMODE = 1. Note that, if not in H-bridge mode, this bit has no effect. Set to 1 by user to enable PWM outputs. Cleared by user to disable PWM outputs. If HOFF = 1 and HMODE = 1, see Table 85.

PWMCP[2:0] PWM clock prescaler bits. Sets the UCLK divider.

8:6

5 POINV Set to 1 by user to invert all PWM outputs. Cleared by user to use PWM outputs as normal. 4 HOFF High side off. Set to 1 by user to force PWM0 and PWM2 outputs high. This also forces PWM1 and PWM3 low. Cleared by user to use the PWM outputs as normal. 3 LCOMP Load compare registers.

Cleared by user to use the values previously stored in the internal compare registers. 2 DIR Direction control. Set to 1 by user to enable PWM0 and PWM1 as the output signals while PWM2 and PWM3 are held low. Cleared by user to enable PWM2 and PWM3 as the output signals while PWM0 and PWM1 are held low. 1 HMODE Enables H-bridge mode.1 Set to 1 by user to enable H-bridge mode and Bit 1 to Bit 5 of PWMCON. Cleared by user to operate the PWMs in standard mode. 0 PWMEN Set to 1 by user to enable all PWM outputs. Cleared by user to disable all PWM outputs.

In H-bridge mode, HMODE = 1. See Table 85 to determine the PWM outputs.

Set to 1 by user so that all PWM counters are reset on the next clock edge after the detection of a high-to-low transition on the P1.2/SYNC pin.

Set to 1 by user to enable PWM trip interrupt. When the PWM trip input (Pin P1.3/TRIP) is low, the PWMEN bit is cleared and an interrupt is generated.

[000] = UCLK/2. [001] = UCLK/4. [010] = UCLK/8. [011] = UCLK/16. [100] = UCLK/32. [101] = UCLK/64. [110] = UCLK/128. [111] = UCLK/256.

Set to 1 by user to load the internal compare registers with the values in PWMxCOMx on the next transition of the PWM timer from 0x00 to 0x01.

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On power-up, PWMCON defaults to 0x0012 (HOFF = 1 and HMODE = 1). All GPIO pins associated with the PWM are configured in PWM mode by default (see Tab l e 8 5 ). Clear the PWM trip interrupt by writing any value to the PWMCLRI

Table 85. PWM Output Selection

PWMCON MMR1 PWM Outputs2

ENA HOFF POINV DIR PWM0 PWM1 PWM2 PWM3

0 0 X X 1 1 1 1 X 1 X X 1 0 1 0 1 0 0 0 0 0 HS1 LS1 1 0 0 1 HS1 LS1 0 0 1 0 1 0 HS1 LS1 1 1 1 0 1 1 1 1 HS1 LS1

X is don’t care.

HS = high side, LS = low side.

Table 86. Compare Registers

Name Address Default Value Access

PWM0COM0 0xFFFF0F84 0x0000 R/W PWM0COM1 0xFFFF0F88 0x0000 R/W PWM0COM2 0xFFFF0F8C 0x0000 R/W PWM1COM0 0xFFFF0F94 0x0000 R/W PWM1COM1 0xFFFF0F98 0x0000 R/W PWM1COM2 0xFFFF0F9C 0x0000 R/W PWM2COM0 0xFFFF0FA4 0x0000 R/W PWM2COM1 0xFFFF0FA8 0x0000 R/W PWM2COM2 0xFFFF0FAC 0x0000 R/W

MMR. Note that when using the PWM trip interrupt, clear the PWM interrupt before exiting the ISR. This prevents generation of multiple interrupts.

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PWM0COM0 Compare Register

Name: PWM0COM0

PWM1COM0 Compare Register

Name: PWM1COM0

Address: 0xFFFF0F84

Default value: 0x0000

Access: Read and write

Function: PWM0 output pin goes high when the PWM

timer reaches the count value stored in this register.

PWM0COM1 Compare Register

Name: PWM0COM1

Address: 0xFFFF0F88

Default value: 0x0000

Access: Read and write

Function: PWM0 output pin goes low when the PWM

timer reaches the count value stored in this register.

PWM0COM2 Compare Register

Name: PWM0COM2

Address: 0xFFFF0F8C

Address: 0xFFFF0F94

Default value: 0x0000

Access: Read and write

Function: PWM2 output pin goes high when the PWM

timer reaches the count value stored in this register.

PWM1COM1 Compare Register

Name: PWM1COM1

Address: 0xFFFF0F98

Default value: 0x0000

Access: Read and write

Function: PWM2 output pin goes low when the PWM

timer reaches the count value stored in this register.

PWM1COM2 Compare Register

Name: PWM1COM2

Address: 0xFFFF0F9C

Default value: 0x0000

Access: Read and write

Function: PWM1 output pin goes low when the PWM

timer reaches the count value stored in this register.

PWM0LEN Register

Name: PWM0LEN

Address: 0xFFFF0F90

Default value: 0x0000

Access: Read and write

Function: PWM1 output pin goes high when the PWM

timer reaches the value stored in this register.

Default value: 0x0000

Access: Read and write

Function: PWM3 output pin goes low when the PWM

timer reaches the count value stored in this register.

PWM1LEN Register

Name: PWM1LEN

Address: 0xFFFF0FA0

Default value: 0x0000

Access: Read and write

Function: PWM3 output pin goes high when the PWM

timer reaches the value stored in this register.

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PWM2COM0 Compare Register

Name: PWM2COM0

PWM2LEN Register

Name: PWM2LEN

Address: 0xFFFF0FA4

Default value: 0x0000

Access: Read and write

Function: PWM4 output pin goes high when the PWM

timer reaches the count value stored in this register.

PWM2COM1 Compare Register

Name: PWM2COM1

Address: 0xFFFF0FA8

Default value: 0x0000

Access: Read and write

Function: PWM4 output pin goes low when the PWM

timer reaches the count value stored in this register.

PWM2COM2 Compare Register

Name: PWM2COM2

Address: 0xFFFF0FAC

Address: 0xFFFF0FB0

Default value: 0x0000

Access: Read and write

Function: PWM5 output pin goes high when the PWM

timer reaches the value stored in this register.

PWMCLRI Register

Name: PWMCLRI

Address: 0xFFFF0FB8

Default value: 0x0000

Access: Write only

Function: Write any value to this register to clear a

PWM interrupt source. This register must be written to before exiting a PWM interrupt service routine; otherwise, multiple interrupts occur.

Default value: 0x0000

Access: Read and write

Function: PWM5 output pin goes low when the PWM

timer reaches the count value stored in this register.

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UART SERIAL INTERFACE

Each ADuC706x features a 16450-compatible UART. The UART is a full-duplex, universal, asynchronous receiver/transmitter. A UART performs serial-to-parallel conversion on data characters received from a peripheral device and parallel-to-serial conversion on data characters received from the ARM7TDMI. The UART features a fractional divider that facilitates high accuracy baud rate generation and a network addressable mode. The UART functionality is available on the P1.0/IRQ1/SIN/T0 and P1.1/SOUT pins of the ADuC706x.

The serial communication adopts an asynchronous protocol that supports various word lengths, stop bits, and parity generation options selectable in the configuration register.

BAUD RATE GENERATION

The ADuC706x features two methods of generating the UART baud rate: normal 450 UART baud rate generation and ADuC706x fractional divider.

Normal 450 UART Baud Rate Generation

The baud rate is a divided version of the core clock using the value in COMDIV0 and COMDIV1 MMRs (16-bit value, divisor latch (DL)). The standard baud rate generator formula is

MHz24.10

RateBaud

Tabl e 87 lists common baud rate values.

Table 87. Baud Rate Using the Standard Baud Rate Generator

Baud Rate DL Actual Baud Rate % Error

9600 0x21 9696 1.01% 19,200 0x11 18,824 1.96% 115,200 0x3 106,667 7.41%

ADuC706x Fractional Divider

The fractional divider combined with the normal baud rate generator allows the generation of accurate high speed baud rates.

CORE

CLOCK

(1)

××=216

FBEN

Calculation of the baud rate using a fractional divider is as follows:

RateBaud

2048 ×××=+DLRateBaud

MHz24.10

(216

MDL

+×××

MHz24.10

(2)

)

2048

216

Tabl e 8 8 lists common baud rate values.

Table 88. Baud Rate Using the Fractional Baud Rate Generator

Baud Rate DL M N Actual Baud Rate % Error

9600 0x21 1 21 9598.55 0.015%

19,200 0x10 1 85 19,203 0.015%

115,200 0x2 1 796 115,218 0.015%

UART REGISTER DEFINITIONS

The UART interface consists of the following 11 registers:

COMTX: 8-bit transmit register COMRX: 8-bit receive register COMDIV0: divisor latch (low byte) COMDIV1: divisor latch (high byte) COMCON0: line control register COMCON1: line control register COMSTA0: line status register COMSTA1: line status register COMIEN0: interrupt enable register COMIID0: interrupt identification register COMDIV2: 16-bit fractional baud divide register

COMTX, COMRX, and COMDIV0 share the same address location. COMTX and COMRX can be accessed when Bit 7 in the COMCON0 register is cleared. COMDIV0 or COMDIV1 can be accessed when Bit 7 of COMCON0 or COMCON1, respectively, is set.

/(M + N/2048)

/16DL

Figure 27. Fractional Divider Baud Rate Generation

UART

07079-021

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UART Transmit Register

Write to this 8-bit register (COMTX) to transmit data using the UART.

COMTX Register

Name: COMTX

Address: 0xFFFF0700

Access: Write only

UART Receive Register

This 8-bit register (COMRX) is read to receive data transmitted using the UART.

COMRX Register

Name: COMRX

Address: 0xFFFF0700

Default value: 0x00

Access: Read only

UART Divisor Latch Register 0

This 8-bit register (COMDIV0) contains the least significant byte of the divisor latch that controls the baud rate at which the UART operates.

COMDIV0 Register

Name: COMDIV0

UART Divisor Latch Register 1

This 8-bit register contains the most significant byte of the divisor latch that controls the baud rate at which the UART operates.

COMDIV1 Register

Name: COMDIV1

Address: 0xFFFF0704

Default value: 0x00

Access: Read and write

UART Control Register 0

This 8-bit register (COMCON0) controls the operation of the UART in conjunction with COMCON1.

COMCON0 Register

Name: COMCON0

Address: 0xFFFF070C

Default value: 0x00

Access: Read and write

Address: 0xFFFF0700

Default value: 0x00

Access: Read and write

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Table 89. COMCON0 MMR Bit Designations

Bit Name Description

7 DLAB Divisor latch access. Set by user to enable access to the COMDIV0 and COMDIV1 registers.

6 BRK Set break. Set by user to force transmit to 0. Cleared to operate in normal mode. 5 SP Stick parity. Set by user to force parity to defined values. 1 if EPS = 1 and PEN = 1. 0 if EPS = 0 and PEN = 1. 4 EPS Even parity select bit. Set for even parity. Cleared for odd parity. 3 PEN Parity enable bit. Set by user to transmit and check the parity bit. Cleared by user for no parity transmission or checking. 2 Stop Stop bit.

Cleared by user to generate one stop bit in the transmitted data. 1:0 WLS Word length select. [00] = 5 bits. [01] = 6 bits. [10] = 7 bits. [11] = 8 bits.

Cleared by user to disable access to COMDIV0 and COMDIV1 and enable access to COMRX, COMTX, and COMIEN0.

Set by user to transmit 1.5 stop bits if the word length is 5 bits, or 2 stop bits if the word length is 6 bits, 7 bits, or 8 bits. The receiver checks the first stop bit only, regardless of the number of stop bits selected.

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UART Control Register 1

This 8-bit register controls the operation of the UART in conjunction with COMCON0.

COMCON1 Register

Name: COMCON1

Address: 0xFFFF0710

Default value: 0x00

Access: Read and write

Table 90. COMCON1 MMR Bit Designations

Bit Name Description

7:5 Reserved bits. Not used. 4 LOOPBACK

3:2 Reserved bits. Not used. 1 RTS Request to send. Set by user to force the RTS output to 0.

0 DTR Data terminal ready. Set by user to force the DTR output to 0.

Loopback. Set by user to enable loopback mode. In loopback mode, the transmit pin is forced high.

Cleared by user to force the RTS output to 1.

Cleared by user to force the DTR output to 1.

UART Status Register 0

COMSTA0 Register

Name: COMSTA0

Address: 0xFFFF0714

Default value: 0x60

Access: Read only

Table 91. COMSTA0 MMR Bit Designations

Bit Name Description

7 Reserved. 6 TEMT COMTX and shift register empty status bit.

5 THRE COMTX empty status bit.

4 BI Break indicator.

Cleared automatically. 3 FE Framing error. Set when the stop bit is invalid. Cleared automatically. 2 PE Parity error. Set when a parity error occurs. Cleared automatically. 1 OE Overrun error.

Cleared automatically. 0 DR Data ready. Set automatically when COMRX is full. Cleared by reading COMRX.

Set automatically if COMTX and the shift register are empty. This bit indicates that the data has been transmitted, that is, no more data is present in the shift register.

Cleared automatically when writing to COMTX.

Set automatically if COMTX is empty. COMTX can be written as soon as this bit is set; the previous data might not have been transmitted yet and can still be present in the shift register.

Cleared automatically when writing to COMTX.

Set when P1.0/IRQ1/SIN/T0 pin is held low for more than the maximum word length.

Set automatically if data is overwritten before being read.

Function: This 8-bit read-only register reflects the

current status on the UART.

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UART Status Register 1

COMSTA1 Register

Name: COMSTA1

Address: 0xFFFF0718

Default value: 0x00

Access: Read only

Function: COMSTA1 is a modem status register.

Table 92. COMSTA1 MMR Bit Designations

Bit Name Description

7:5 Reserved. Not used. 4 CTS Clear to send. 3:1 Reserved. Not used. 0 DCTS Delta CTS.

Cleared automatically by reading COMSTA1.

UART Interrupt Enable Register 0

COMIEN0 Register

Name: COMIEN0

Address: 0xFFFF0704

Default value: 0x00

Access: Read and write

Function: This 8-bit register enables and disables the

Set automatically if CTS changed state since COMSTA1 was last read.

individual UART interrupt sources.

Table 93. COMIEN0 MMR Bit Designations

Bit Name Description

7:4 Reserved. Not used. 3 EDSSI Modem status interrupt enable bit.

Cleared by user. 2 ELSI Receive status interrupt enable bit.

Cleared by user. 1 ETBEI Enable transmit buffer empty interrupt.

Cleared by user. 0 ERBFI Enable receive buffer full interrupt.

Cleared by user.

Set by user to enable generation of an interrupt if any of COMSTA0[3:1] are set.

Set by user to enable generation of an interrupt if any of the COMSTA0[3:1] register bits are set.

Set by user to enable an interrupt when the buffer is empty during a transmission; that is, when COMSTA0[5] is set.

Set by user to enable an interrupt when the buffer is full during a reception.

UART Interrupt Identification Register 0

COMIID0 Register

Name: COMIID0

Address: 0xFFFF0708

Default value: 0x01

Access: Read only

Function: This 8-bit register reflects the source of the

UART i n t e rrupt.

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Table 94. COMIID0 MMR Bit Designations

Status Bits[2:1] Bit 0 Priority Definition

00 1 No interrupt 11 0 1

10 0 2

01 0 3

00 0 4

Receive line status interrupt

Receive buffer full interrupt

Transmit buffer empty interrupt

Modem status interrupt

Clearing Operation

Read COMSTA0

Read COMRX

Write data to COMTX or read COMIID0

Read COMSTA1 register

UART Fractional Divider Register

This 16-bit register (COMDIV2) controls the operation of the fractional divider for the ADuC706x.

COMDIV2 Register

Name: COMDIV2

Address: 0xFFFF072C

Table 95. COMDIV2 MMR Bit Designations

Bit Name Description

15 FBEN Fractional baud rate generator enable bit.

14:13 Reserved. 12:11 FBM[1:0]

10:0 FBN[10:0]

Set by user to enable the fractional baud rate generator.

Cleared by user to generate the baud rate using the standard 450 UART baud rate generator.

M. If FBM = 0, M = 4. See Equation 2 for the calculation of the baud rate using a fractional divider and Table 87 for common baud rate values.

N. See Equation 2 for the calculation of the baud rate using a fractional divider and Table 87 for common baud rate values.

Default value: 0x0000

Access: Read and write

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I2C

Each ADuC706x incorporates an I2C peripheral that can be configured as a fully I as a fully I

C bus-compatible slave device. The two pins used for data transfer, SDA and SCL, are configured in a wire-AND’ed format that allows arbitration in a multimaster system. These pins require external pull-up resistors. Typical pull-up resistor values are between 4.7 kΩ and 10 kΩ.

Users program the I system). This ID can be modified any time that a transfer is not in progress. The user can configure the interface to respond to four slave addresses.

The transfer sequence of an I device initiating a transfer by generating a start condition while the bus is idle. The master transmits the slave device address and the direction of the data transfer (read or initial address transfer. If the master does not lose arbitration and the slave acknowledges, the data transfer is initiated. This continues until the master issues a stop condition and the bus becomes idle.

The I

C peripheral can be configured only as a master or a slave at any given time. The same I support master and slave modes.

The I

C interface on the ADuC706x includes the following features:

•

Support for repeated start conditions. In master mode, the

ADuC706x can be programmed to generate a repeated start. In slave mode, the ADuC706x recognizes repeated start conditions.

•

In master and slave modes, the part recognizes both 7-bit

and 10-bit bus addresses.

C-compatible I2C bus master device or

C bus peripheral (addressed in the I2C bus

C system consists of a master

write

) during the

C channel cannot simultaneously

•

In I

C master mode, the ADuC706x supports continuous reads from a single slave up to 512 bytes in a single transfer sequence.

•

Clock stretching is supported in both master and slave

modes.

In slave mode, the ADuC706x can be programmed to

•

return a no acknowledge (NACK). This allows the validation of checksum bytes at the end of I

Bus arbitration in master mode is supported.

•

Internal and external loopback modes are supported for

•

C hardware testing.

The transmit and receive circuits in both master and slave

•

C transfers.

modes contain 2-byte FIFOs. Status bits are available to the user to control these FIFOs.

CONFIGURING EXTERNAL PINS FOR I2C FUNCTIONALITY

The I2C functions of the P0.1/SCLK/SCL and P0.3/MOSI/SDA pins of the ADuC706x device are P0.1 and P0.3. The function of P0.1 is the I

C data signal (SDA). To configure P0.1 and P0.3 for I2C mode, Bit 4 and Bit 12 of the GP0CON0 register must be set to 1. Bit 1 of the GP0CON1 register must also be set to 1 to enable I mode.

Note that, to write to GP0CON1, the GP0KEY1 register must be set to 0x7 immediately before writing to GP0CON1. Also, the GP0KEY2 register must be set to 0x13 immediately after writing to GP0CON1. The following code example shows this in detail:

C clock signal (SCL) and the function of P0.3 is the

GP0CON0 = BIT4 + BIT12; // Select SPI/I2C alternative function for P0.1 and P0.3 GP0KEY1 = 0x7; // Write to GP0KEY1 GP0CON1 = BIT1; // Select I2C functionality for P0.1 and P0.3 GP0KEY2 = 0x13; // Write to GP0KEY2

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SERIAL CLOCK GENERATION

C master in the system generates the serial clock for a

The I transfer. The master channel can be configured to operate in fast mode (400 kHz) or standard mode (100 kHz).

The bit rate is defined in the I2CDIV MMR as follows:

CLOCKSERIAL

UCLK

) (2 )2( DIVLDIVH +++

where:

is the clock before the clock divider.

UCLK

DIVH is the high period of the clock. DIVL is the low period of the clock.

Thus, for 100 kHz operation

DIVH = DIVL = 0x33

and for 400 kHz

DIVH = 0x0A, DIVL = 0x0F

The I2CDIV register corresponds to DIVH:DIVL.

I2C BUS ADDRESSES

Slave Mode

In slave mode, the I2CID0, I2CID1, I2CID2, and I2CID3 registers contain the device IDs. The device compares the four I2CIDx registers to the address byte received from the bus master. To be correctly addressed, the 7 MSBs of any ID register must be identical to the 7 MSBs of the first received address byte. The least significant bit of the ID registers (the transfer direction bit) is ignored in the process of address recognition.

The ADuC706x also supports 10-bit addressing mode. When Bit 1 of I2CSCON (ADR10EN bit) is set to 1, then one 10-bit address is supported in slave mode and is stored in the I2CID0 and I2CID1 registers. The 10-bit address is derived as follows:

I2CID0[0] is the read/write bit and is not part of the I address.

I2CID0[7:1] = Address Bits[6:0].

I2CID1[2:0] = Address Bits[9:7].

I2CID1[7:3] must be set to 11110b.

Master Mode

In master mode, the I2CADR0 register is programmed with the

C address of the device.

In 7-bit address mode, I2CADR0[7:1] are set to the device address. I2CADR0[0] is the read/write bit.

In 10-bit address mode, the 10-bit address is created as follows:

I2CADR0[7:3] must be set to 11110b.

I2CADR0[2:1] = Address Bits[9:8].

I2CADR1[7:0] = Address Bits[7:0].

I2CADR0[0] is the read/write bit.

I2C REGISTERS

C peripheral interface consists overall of 19 MMRs. Nine

The I of these are master related only, nine are slave related only, and one MMR is common to both master and slave modes.

C Master Registers

I2C Master Control, I2CMCON Register

Name: I2CMCON

Address: 0xFFFF0900

Default value:

Access: Read and write

Function:

0x0000

This 16-bit MMR configures the I master mode.

C peripheral in

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Table 96. I2CMCON MMR Bit Designations

Bit Name Description

15:9 Reserved. These bits are reserved and should not be written to. 8 I2CMCENI I2C transmission complete interrupt enable bit. Set this bit to enable an interrupt on detecting a stop condition on the I2C bus. Clear this interrupt source. 7 I2CNACKENI I2C no acknowledge (NACK) received interrupt enable bit. Set this bit to enable interrupts when the I2C master receives a no acknowledge. Clear this interrupt source. 6 I2CALENI I2C arbitration lost interrupt enable bit. Set this bit to enable interrupts when the I2C master did not gain control of the I2C bus. Clear this interrupt source. 5 I2CMTENI I2C transmit interrupt enable bit. Set this bit to enable interrupts when the I2C master has transmitted a byte. Clear this interrupt source. 4 I2CMRENI I2C receive interrupt enable bit. Set this bit to enable interrupts when the I2C master receives data. Cleared by user to disable interrupts when the I2C master is receiving data.

I2CMSEN I2C master SCL stretch enable bit.

Clear this bit to disable clock stretching.

2 I2CILEN I2C internal loopback enable.

Cleared by user to disable loopback mode. 1 I2CBD I2C master backoff disable bit.

Clear this bit to back off until the I2C bus becomes free. 0 I2CMEN I2C master enable bit. Set by user to enable the I2C master mode. Cleared to disable the I2C master mode.

Set this bit to 1 to enable clock stretching. When SCL is low, setting this bit forces the device to hold SCL low until I2CMSEN is cleared. If SCL is high, setting this bit forces the device to hold SCL low after the next falling edge.

Set this bit to enable loopback test mode. In this mode, the SCL and SDA signals are connected internally to their respective input signals.

Set this bit to allow the device to compete for control of the bus even if another device is currently driving a start condition.

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I2C Master Status, I2CMSTA, Register

Name: I2CMSTA

Address: 0xFFFF0904

Default value: 0x0000

Access: Read only

Function: This 16-bit MMR is the I

Table 97. I2CMSTA MMR Bit Designations

Bit Name Description

15:11 Reserved. These bits are reserved. 10 I2CBBUSY I2C bus busy status bit. This bit is set to 1 when a start condition is detected on the I2C bus. This bit is cleared when a stop condition is detected on the bus. 9 I2CMRxFO Master receive FIFO overflow. This bit is set to 1 when a byte is written to the receive FIFO when it is already full. This bit is cleared in all other conditions. 8 I2CMTC I2C transmission complete status bit.

Clear this interrupt source. 7 I2CMNA I2C master no acknowledge data bit

This bit is cleared in all other conditions. 6 I2CMBUSY I2C master busy status bit. Set to 1 when the master is busy processing a transaction. Cleared if the master is ready or if another master device has control of the bus. 5 I2CAL I2C arbitration lost status bit.

This bit is cleared in all other conditions. 4

3 I2CMRXQ I2C master receive request bit. This bit is set to 1 when data enters the receive FIFO. If the I2CMRENI in I2CMCON is set, an interrupt is generated. This bit is cleared in all other conditions. 2 I2CMTXQ I2C master transmit request bit.

This bit is cleared in all other conditions. 1:0 I2CMTFSTA I2C master transmit FIFO status bits. [00] = I2C master transmit FIFO empty. [01] = 1 byte in master transmit FIFO. [10] = 1 byte in master transmit FIFO. [11] = I2C master transmit FIFO full.

I2CMNA I2C master no acknowledge address bit.

This bit is cleared in all other conditions.

This bit is set to 1 when a transmission is complete between the master and the slave with which it was communicating. If the I2CMCENI bit in I2CMCON is set, an interrupt is generated when this bit is set.

This bit is set to 1 when a no acknowledge condition is received by the master in response to a data write transfer. If the I2CNACKENI bit in I2CMCON is set, an interrupt is generated when this bit is set.

This bit is set to 1 when the I interrupt is generated when this bit is set.

This bit is set to 1 when a no acknowledge condition is received by the master in response to an address. If the I2CNACKENI bit in I2CMCON is set, an interrupt is generated when this bit is set.

This bit goes high if the transmit FIFO is empty or contains only one byte and the master has transmitted an address + write. If the I2CMTENI bit in I2CMCON is set, an interrupt is generated when this bit is set.

C status register in master mode.

C master does not gain control of the I2C bus. If the I2CALENI bit in I2CMCON is set, an

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I2C Master Receive, I2CMRX, Register

Name: I2CMRX

I2C Master Current Read Count, I2CMCNT1, Register

Name: I2CMCNT1

Address: 0xFFFF0908

Default value: 0x00

Access: Read only

Function: This 8-bit MMR is the I

C master receive

I2C Master Transmit, I2CMTX, Register

Name: I2CMTX

Address: 0xFFFF090C

Default value: 0x00

Access: Write only

Function: This 8-bit MMR is the I

C master transmit

I2C Master Read Count, I2CMCNT0, Register

Name: I2CMCNT0

Address: 0xFFFF0910

Default value: 0x0000

Access: Read and write

Function: This 16-bit MMR holds the required number

of bytes when the master begins a read sequence from a slave device.

Table 98. I2CMCNT0 MMR Bit Designations

Bit Name Description

15:9 Reserved. 8 I2CRECNT

7:0 I2CRCNT

Set this bit if more than 256 bytes are required from the slave.

Clear this bit when reading 256 bytes or fewer.

These eight bits hold the number of bytes required during a slave read sequence, minus 1. If only a single byte is required, set these bits to 0.

Address: 0xFFFF0914

Default value: 0x00

Access: Read only

Function: This 8-bit MMR holds the number of bytes

received so far during a read sequence with a slave device.

I2C Address 0, I2CADR0, Register

Name: I2CADR0

Address: 0xFFFF0918

Default value: 0x00

Access: Read and write

Function: This 8-bit MMR holds the 7-bit slave address

and the read/write bit when the master begins communicating with a slave.

Table 99. I2CADR0 MMR in 7-Bit Address Mode

Bit Name Description

7:1 I2CADR

R/W When this bit = 1, a read sequence is requested. When this bit = 0, a write sequence is requested.

These bits contain the 7-bit address of the required slave device.

Bit 0 is the read/write bit.

Table 100. I2CADR0 MMR in 10-Bit Address Mode

Bit Name Description

7:3

2:1 I2CMADR

R/W

These bits must be set to [11110b] in 10-bit address mode.

These bits contain ADDR[9:8] in 10-bit addressing mode.

Read/write bit. When this bit = 1, a read sequence is

requested. When this bit = 0, a write sequence is

requested.

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I2C Address 1, I2CADR1, Register

Name: I2CADR1

I2C Master Clock Control, I2CDIV, Register

Name: I2CDIV

Address: 0xFFFF091C

Default value: 0x00

Access: Read and write

Function: This 8-bit MMR is used in 10-bit addressing

mode only. This register contains the least significant byte of the address.

Table 101. I2CADR1 MMR in 10-Bit Address Mode

Bit Name Description

7:0 I2CLADR

These bits contain ADDR[7:0] in 10-bit addressing mode.

Address: 0xFFFF0924

Default value: 0x1F1F

Access: Read and write

Function: This MMR controls the frequency of the I

clock generated by the master on to the SCL pin. For further details, see the Serial Clock Generation section.

Table 102. I2CDIV MMR Bit Designations

Bit Name Description

15:8 DIVH

7:0 DIVL

These bits control the duration of the high period of SCL.

These bits control the duration of the low period of SCL.

I2C Slave Registers

C Slave Control, I2CSCON, Register

Name: I2CSCON

Address: 0xFFFF0928

Default value: 0x0000

Access: Read and write

Function: This 16-bit MMR configures the I

in slave mode.

C peripheral

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Table 103. I2CSCON MMR Bit Designations

Bit Name Description

15:11 Reserved bits. 10 I2CSTXENI Slave transmit interrupt enable bit. Set this bit to enable an interrupt after a slave transmits a byte. Clear this interrupt source. 9 I2CSRXENI Slave receive interrupt enable bit. Set this bit to enable an interrupt after the slave receives data. Clear this interrupt source. 8 I2CSSENI I2C stop condition detected interrupt enable bit. Set this bit to enable an interrupt on detecting a stop condition on the I2C bus. Clear this interrupt source. 7 I2CNACKEN I2C no acknowledge enable bit. Set this bit to no acknowledge the next byte in the transmission sequence. Clear this bit to let the hardware control the acknowledge/no acknowledge sequence. 6 I2CSSEN I2C slave SCL stretch enable bit.

Clear this bit to disable clock stretching. 5 I2CSETEN I2C early transmit interrupt enable bit.

4 I2CGCCLR I2C general call status and ID clear bit. Writing a 1 to this bit clears the general call status and ID bits in the I2CSSTA register. Clear this bit at all other times. 3 I2CHGCEN

2 I2CGCEN

1 ADR10EN I2C 10-bit address mode. Set to 1 to enable 10-bit address mode. Clear to 0 to enable normal address mode. 0 I2CSEN I2C slave enable bit. Set by user to enable I2C slave mode. Clear to disable I2C slave mode.

Set this bit to 1 to enable clock stretching. When SCL is low, setting this bit forces the device to hold SCL low until I2CSSEN is cleared. If SCL is high, setting this bit forces the device to hold SCL low after the next falling edge.

Setting this bit enables a transmit request interrupt just after the positive edge of SCL during the read bit transmission.

Clear this bit to enable a transmit request interrupt just after the negative edge of SCL during the read bit transmission.

Hardware general call enable. When this bit and Bit 2 are set, and having received a general call (Address 0x00) and a data byte, the device checks the contents of the I2CALT against the receive register. If the contents match, the device has received a hardware general call. This is used if a device needs urgent attention from a master device without knowing which master it needs to turn to. This is a “to whom it may concern” call. The ADuC706x watches for these addresses. The device that requires attention embeds its own address into the message. All masters listen, and the one that can handle the device contacts its slave and acts appropriately. The LSB of the I2CALT register should always be written to 1, as per the I

General call enable bit. Set this bit to enable the slave device to acknowledge an I

C January 2000 bus specification.

C general call, Address 0x00 (write). The device then recognizes a data bit. If it receives a 0x06 (reset and write programmable part of the slave address by hardware) as the data byte, the I2C interface resets as per the I2C January 2000 bus specification. This command can be used to reset an entire I

C system. If it receives a 0x04 (write programmable part of the slave address by hardware) as the data byte, the general call interrupt status bit sets on any general call. The user must take corrective action by reprogramming the device address.

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I2C Slave Status, I2CSSTA, Register

Name: I2CSSTA

Address: 0xFFFF092C

Default value: 0x0000

Access: Read and write

Function: This 16-bit MMR is the I

Table 104. I2CSSTA MMR Bit Designations

Bit Name Description

15 Reserved bit. 14 I2CSTA

This bit is cleared on receiving a stop condition 13 I2CREPS This bit is set to 1 if a repeated start condition is detected. This bit is cleared on receiving a stop condition. 12:11 I2CID[1:0] I2C address matching register. These bits indicate which I2CIDx register matches the received address. [00] = received address matches I2CID0. [01] = received address matches I2CID1. [10] = received address matches I2CID2. [11] = received address matches I2CID3. 10 I2CSS I2C stop condition after start detected bit.

This bit is cleared by reading this register. 9:8 I2CGCID[1:0] I2C general call ID bits. [00] = no general call received. [01] = general call reset and program address. [10] = general program address. [11] = general call matching alternative ID. Note that these bits are not cleared by a general call reset command. Clear these bits by writing a 1 to the I2CGCCLR bit in I2CSCON. 7 I2CGC I2C general call status bit.

Clear this bit by writing a 1 to the I2CGCCLR bit in I2CSCON. 6 I2CSBUSY I2C slave busy status bit. Set to 1 when the slave receives a start condition.

5 I2CSNA I2C slave no acknowledge data bit.

This bit is cleared in all other conditions. 4 I2CSRxFO Slave receive FIFO overflow. This bit is set to 1 when a byte is written to the receive FIFO when it is already full. This bit is cleared in all other conditions. 3

I2CSRXQ I2C slave receive request bit.

The receive FIFO must be read or flushed to clear this bit.

This bit is set to 1 if a start condition followed by a matching address is detected, a start byte (0x01) is received, or general calls are enabled and a general call code of 0x00 is received.

This bit is set to 1 when a stop condition is detected after a previous start and matching address. When the I2CSSENI bit in I2CSCON is set, an interrupt is generated.

This bit is set to 1 if the slave receives a general call command of any type. If the command received was a reset command, then all registers return to their default states. If the command received was a hardware general call, the receive FIFO holds the second byte of the command, and this can be compared with the I2CALT register.

Cleared by hardware if the received address does not match any of the I2CIDx registers, the slave device receives a stop condition, or a repeated start address does not match any of the I2CIDx registers.

This bit is set to 1 when the slave responds to a bus address with a no acknowledge. This bit is asserted under the following conditions: if a no acknowledge was returned because there was no data in the transmit FIFO or if the I2CNACKEN bit was set in the I2CSCON register.

This bit is set to 1 when the receive FIFO of the slave is not empty. This bit causes an interrupt to occur if the I2CSRXENI bit in I2CSCON is set.

C status register in slave mode.

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Bit Name Description

2 I2CSTXQ I2C slave transmit request bit.

This bit is cleared in all other conditions. 1 I2CSTFE I2C slave FIFO underflow status bit.

This bit is cleared in all other conditions. 0 I2CETSTA I2C slave early transmit FIFO status bit.

This bit is cleared after being read.

I2C Slave Receive, I2CSRX, Register

Name: I2CSRX

Address: 0xFFFF0930

Default value: 0x00

Access: Read only

Function: This 8-bit MMR is the I

I2C Slave Transmit, I2CSTX, Register

Name: I2CST X

Address: 0xFFFF0934

Default value: 0x00

Access: Write only

Function: This 8-bit MMR is the I

This bit is set to 1 when the slave receives a matching address followed by a read. If the I2CSETEN bit in I2CSCON is =0, this bit goes high just after the negative edge of SCL during the read bit transmission. If the I2CSETEN bit in I2CSCON is =1, this bit goes high just after the positive edge of SCL during the read bit transmission. This bit causes an interrupt to occur if the I2CSTXENI bit in I2CSCON is set.

This bit goes high if the transmit FIFO is empty when a master requests data from the slave. This bit is asserted at the rising edge of SCL during the read bit.

If the I2CSETEN bit in I2CSCON is =0, this bit goes high if the slave transmit FIFO is empty. If the I2CSETEN bit in I2CSCON = 1, this bit goes high just after the positive edge of SCL during the write bit transmission. This bit asserts once only for a transfer.

C slave receive register.

C slave transmit

I2C Hardware General Call Recognition, I2CALT, Register

Name: I2CALT

Address: 0xFFFF0938

Default value: 0x00

Access: Read and write

Function: This 8-bit MMR is used with hardware general

calls when the I2CSCON Bit 3 is set to 1. This register is used in cases where a master is unable to generate an address for a slave and, instead, the slave must generate the address for the master.

I2C Slave Device ID, I2CIDx, Registers

Name: I2CIDx

Addresses: 0xFFFF093C = I2CID0

0xFFFF0940 = I2CID1

0xFFFF0944 = I2CID2

0xFFFF0948 = I2CID3

Default value: 0x00

Access: Read and write

Function: These 8-bit MMRs are programmed with the

Rev. C | Page 94 of 108

C bus IDs of the slave. See the I2C Bus

Addresses section for further details.

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I2C Common Registers

C FIFO Status, I2CFSTA, Register

Name: I2CFSTA

Address: 0xFFFF094C

Default value: 0x0000

Access: Read and write

Function: This 16-bit MMR contains the status of the

receive/transmit FIFOs in both master and slave modes.

Table 105. I2CFSTA MMR Bit Designations

Bit Name Description

15:10 Reserved bits. 9 I2CFMTX

8 I2CFSTX

7:6 I2CMRXSTA I2C master receive FIFO status bits. [00] = FIFO empty. [01] = byte written to FIFO. [10] = one byte in FIFO. [11] = FIFO full. 5:4 I2CMTXSTA I2C master transmit FIFO status bits. [00] = FIFO empty. [01] = byte written to FIFO. [10] = one byte in FIFO. [11] = FIFO full. 3:2 I2CSRXSTA I2C slave receive FIFO status bits. [00] = FIFO empty [01] = byte written to FIFO [10] = one byte in FIFO [11] = FIFO full 1:0 I2CSTXSTA I2C slave transmit FIFO status bits. [00] = FIFO empty. [01] = byte written to FIFO. [10] = one byte in FIFO. [11] = FIFO full.

Set this bit to 1 to flush the master transmit FIFO.

Set this bit to 1 to flush the slave transmit FIFO.

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SERIAL PERIPHERAL INTERFACE

The ADuC706x integrates a complete hardware serial peripheral interface (SPI) on chip. SPI is an industry standard, synchronous serial interface that allows eight bits of data to be synchronously transmitted and simultaneously received, that is, full duplex up to a maximum bit rate of 5.12 Mbps.

The SPI port can be configured for master or slave operation and typically consists of four pins: MISO, MOSI, SCLK, and

MISO (MASTER IN, SLAVE OUT) PIN

The MISO pin is configured as an input line in master mode and an output line in slave mode. The MISO line on the master (data in) should be connected to the MISO line in the slave device (data out). The data is transferred as byte wide (8-bit) serial data, most significant bit first.

MOSI (MASTER OUT, SLAVE IN) PIN

The MOSI pin is configured as an output line in master mode and an input line in slave mode. The MOSI line on the master (data out) should be connected to the MOSI line in the slave device (data in). The data is transferred as byte wide (8-bit) serial data, most significant bit first.

SCLK (SERIAL CLOCK I/O) PIN

The master serial clock (SCL) synchronizes the data being transmitted and received through the MOSI SCLK period. Therefore, a byte is transmitted/received after eight SCLK periods. The SCLK pin is configured as an output in master mode and as an input in slave mode.

In master mode, polarity and phase of the clock are controlled by the SPICON register, and the bit rate is defined in the SPIDIV register as follows:

The maximum speed of the SPI clock is independent of the clock divider bits.

CLOCKSERIAL

+×

UCLK

)1(2 SPIDIV

In slave mode, the SPICON register must be configured with the phase and polarity of the expected input clock. The slave accepts data from an external master up to 5.12 Mbps.

In both master and slave modes, data transmit on one edge of the SCLK signal and sample on the other. Therefore, it is important that the polarity and phase be configured the same

for the master and slave devices.

SLAVE SELECT (P0.0/SS) INPUT PIN

In SPI slave mode, a transfer is initiated by the assertion of on the P0.0/ port then transmits and receives 8-bit data until the transfer is concluded by deassertion of input.

In SPI master mode, itself automatically at the beginning of a transfer and deasserts itself upon completion.

pin, which is an active low input signal. The SPI

. In slave mode, SS is always an

is an active low output signal. It asserts

CONFIGURING EXTERNAL PINS FOR SPI FUNCTIONALITY

The SPI pins of the ADuC706x device are represented by the P0[0:3] function of the following pins:

•

P0.0/

•

P0.1/SCLK/SCL is the SCLK pin. P0.2/MISO is the master in, slave out (MISO) pin.

•

P0.3/MOSI/SDA is the master out, slave in (MOSI) pin.

•

To configure P0.0 to P0.3 for SPI mode, Bit 0, Bit 4, Bit 8, and Bit 12 of the GP0CON0 register must be set to 1. Bit 1 of the GP0CON1 must be set to 1. Note that to write to GP0CON1, the GP0KEY1 register must be set to 0x7 immediately before writing to GP0CON1. Also, the GP0KEY2 register must be set to 0x13 immediately after writing to GP0CON1. The following code example shows this in detail:

is the slave chip select pin. In slave mode, this pin is an input and must be driven low by the master. In master mode, this pin is an output and goes low at the beginning of a transfer and high at the end of a transfer.

GP0CON0 = BIT0 + BIT4 + BIT8 + BIT12; //Select SPI/I2C alternative function for P0[0...3] GP0KEY1 = 0x7; //Write to GP0KEY1 GP0CON1 &=~ BIT1; //Select SPI functionality for P0.0 to P0.3 GP0KEY2 = 0x13; //Write to GP0KEY2

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SPI REGISTERS

The following MMR registers control the SPI interface: SPISTA, SPIRX, SPITX, SPIDIV, and SPICON.

SPI Status Register

SPISTA Register

Name: SPISTA

Address: 0xFFFF0A00

Default value: 0x00000000

Access: Read only

Function: This 32-bit MMR contains the status of the SPI interface in both master and slave modes.

Table 106. SPISTA MMR Bit Designations

Bit Name Description

15:12 Reserved bits. 11 SPIREX

This bit is cleared when the number of bytes in the FIFO is equal to or less than the number in SPIMDE. 10:8 SPIRXFSTA[2:0] SPI receive FIFO status bits. [000] = receive FIFO is empty. [001] = 1 valid byte in the FIFO. [010] = 2 valid bytes in the FIFO. [011] = 3 valid bytes in the FIFO. [100] = 4 valid bytes in the FIFO. 7 SPIFOF SPI receive FIFO overflow status bit.

Cleared when the SPISTA register is read. 6 SPIRXIRQ SPI receive IRQ status bit.

Cleared when the SPISTA register is read. 5

4 SPITXUF SPI transmit FIFO underflow.

Cleared when the SPISTA register is read. 3:1 SPITXFSTA[2:0] SPI transmit FIFO status bits. [000] = transmit FIFO is empty. [001] = 1 valid bytes in the FIFO. [010] = 2 valid bytes in the FIFO. [011] = 3 valid bytes in the FIFO. [100] = 4 valid bytes in the FIFO. 0 SPIISTA SPI interrupt status bit. Set to 1 when an SPI based interrupt occurs. Cleared after reading SPISTA.

SPITXIRQ SPI transmit IRQ status bit.

Cleared when the SPISTA register is read.

SPI receive FIFO excess bytes present. This bit is set when there are more bytes in the receive FIFO than indicated in the SPIMDE bits in SPICON.

Set when the receive FIFO was already full when new data was loaded to the FIFO. This bit generates an interrupt except when SPIRFLH is set in SPICON.

Set when a receive interrupt occurs. This bit is set when SPITMDE in SPICON is cleared and the required number of bytes has been received.

Set when a transmit interrupt occurs. This bit is set when SPITMDE in SPICON is set and the required number of bytes has been transmitted.

This bit is set when a transmit is initiated without any valid data in the transmit FIFO. This bit generates an interrupt except when SPITFLH is set in SPICON.

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SPI Receive Register

SPIRX Register

Name: SPIRX

SPI Baud Rate Selection Register

SPIDIV Register

Name: SPIDIV

Address: 0xFFFF0A04

Default value: 0x00

Access: Read only

Function: This 8-bit MMR is the SPI receive register.

SPI Transmit Register

SPITX Register

Name: SPITX

Address: 0xFFFF0A08

Default value: 0x00

Access: Write only

Function: This 8-bit MMR is the SPI transmit register.

Address: 0xFFFF0A0C

Default value: 0x1B

Access: Write only

Function: This 8-bit MMR is the SPI baud rate selection

SPI Control Register

SPICON Register

Name: SPICON

Address: 0xFFFF0A10

Default value: 0x0000

Access: Read and write

Function: This 16-bit MMR configures the SPI peripheral

in both master and slave modes.

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Table 107. SPICON MMR Bit Designations

Bit Name Description

15:14 SPIMDE SPI IRQ mode bits. These bits are configured when transmit/receive interrupts occur in a transfer.

13 SPITFLH SPI transmit FIFO flush enable bit.

Clear this bit to disable transmit FIFO flushing. 12 SPIRFLH SPI receive FIFO flush enable bit.

Clear this bit to disable receive FIFO flushing. 11 SPICONT

10 SPILP Loopback enable bit. Set by user to connect MISO to MOSI and test software. Cleared by user to be in normal mode. 9 SPIOEN Slave MISO output enable bit. Set this bit for MISO to operate as normal. Clear this bit to disable the output driver on the MISO pin. The MISO pin is open drain when this bit is cleared. 8 SPIROW SPIRX overflow overwrite enable. Set by user, the valid data in the receive register is overwritten by the new serial byte received. Cleared by user, the new serial byte received is discarded. 7 SPIZEN SPI transmit zeros when transmit FIFO is empty. Set this bit to transmit 0x00 when there is no valid data in the transmit FIFO. Clear this bit to transmit the last transmitted value when there is no valid data in the transmit FIFO. 6 SPITMDE SPI transfer and interrupt mode. Set by user to initiate transfer with a write to the SPITX register. Interrupt occurs only when the transmit FIFO is empty. Cleared by user to initiate transfer with a read of the SPI register. Interrupt occurs only when the receive FIFO is full. 5 SPILF LSB first transfer enable bit. Set by user, the LSB is transmitted first. Cleared by user, the MSB is transmitted first. 4 SPIWOM SPI wired or mode enable bit. Set to 1 to enable the open-drain data output enable. External pull-ups are required on data out pins. Clear for normal output levels. 3 SPICPO

2 SPICPH Serial clock phase mode bit. Set by user, the serial clock pulses at the beginning of each serial bit transfer. Cleared by user, the serial clock pulses at the end of each serial bit transfer.

[00] = transmit interrupt occurs when 1 byte has been transferred. Receive interrupt occurs when one or more bytes have been received into the FIFO.

[01] = transmit interrupt occurs when 2 bytes have been transferred. Receive interrupt occurs when two or more bytes have been received into the FIFO.

[10] = transmit interrupt occurs when 3 bytes have been transferred. Receive interrupt occurs when three or more bytes have been received into the FIFO.

[11] = transmit interrupt occurs when 4 bytes have been transferred. Receive interrupt occurs when the receive FIFO is full or 4 bytes are present.

Set this bit to flush the transmit FIFO. This bit does not clear itself and should be toggled if a single flush is required. If this bit is left high, then either the last transmitted value or 0x00 is transmitted, depending on the SPIZEN bit. Any writes to the transmit FIFO are ignored while this bit is set.

Set this bit to flush the receive FIFO. This bit does not clear itself and should be toggled if a single flush is required. If this bit is set, all incoming data is ignored and no interrupts are generated. If set and SPITMDE = 0, a read of the receive FIFO initiates a transfer.

Continuous transfer enable. Set by user to enable continuous transfer. In master mode, the transfer continues until no valid data is available in the

transmit register. SS register is empty.

Cleared by user to disable continuous transfer. Each transfer consists of a single 8-bit serial transfer. If valid data exists in the SPITX register, then a new transfer is initiated after a stall period of one serial clock cycle.

Serial clock polarity mode bit. Set by user, the serial clock idles high. Cleared by user, the serial clock idles low.

is asserted and remains asserted for the duration of each 8-bit serial transfer until the transmit

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Bit Name Description

1 SPIMEN Master mode enable bit. Set by user to enable master mode. Cleared by user to enable slave mode. 0 SPIEN SPI enable bit. Set by user to enable the SPI. Cleared by user to disable the SPI.

Rev. C | Page 100 of 108

Datasheet ADuC7060, ADuC7061 Datasheet (ANALOG DEVICES)

Specifications and Main Features

Frequently Asked Questions

User Manual

FEATURES

APPLICATIONS

GENERAL DESCRIPTION

TABLE OF CONTENTS

REVISION HISTORY

FUNCTIONAL BLOCK DIAGRAM

SPECIFICATIONS

ELECTRICAL SPECIFICATIONS

TIMING SPECIFICATIONS

I2C Timing

SPI Timing

ABSOLUTE MAXIMUM RATINGS

ESD CAUTION

PIN CONFIGURATIONS AND FUNCTION DESCRIPTIONS

TERMINOLOGY

OVERVIEW OF THE ARM7TDMI CORE

THUMB MODE (T)

MULTIPLIER (M)

EmbeddedICE (I)

ARM7 Exceptions

ARM REGISTERS

INTERRUPT LATENCY

MEMORY ORGANIZATION

Memory Format

SRAM

Remap

Remap Operation

Remap Register

FLASH/EE CONTROL INTERFACE

FEESTA Register

FEEMOD Register

FEECON Register

FEEDAT Register

FEEHIDE Register

FEEADR Register

FEESIGN Register

FEEPRO Register

Temporary Protection

Keyed Permanent Protection

Permanent Protection

Sequence to Write the Software Protection Key and Set Permanent Protection

Command Sequence for Executing a Mass Erase

MEMORY MAPPED REGISTERS

COMPLETE MMR LISTING

RESET

RSTSTA Register

RSTCLR Register

OSCILLATOR, PLL, AND POWER CONTROL

CLOCKING SYSTEM

External Crystal Selection

External Clock Selection

POWER CONTROL SYSTEM

Power and Clock Control Registers

ADC CIRCUIT INFORMATION

REFERENCE SOURCES

DIAGNOSTIC CURRENT SOURCES

SINC3 FILTER

ADC CHOPPING

PROGRAMMABLE GAIN AMPLIFIER

EXCITATION SOURCES

ADC LOW POWER MODE

ADC COMPARATOR AND ACCUMULATOR ADC MMR INTERFACE

TEMPERATURE SENSOR

ADC Status Register

ADC Interrupt Mask Register

ADC Mode Register

Primary ADC Control Register

Auxiliary ADC Control Register

ADC Filter Register

ADC Configuration Register

Primary Channel ADC Data Register

Primary Channel ADC Offset Calibration Register

Auxiliary Channel ADC Data Register

Auxiliary Channel ADC Offset Calibration Register

Primary Channel ADC Gain Calibration Register

Auxiliary Channel Gain Calibration Register