Analog Devices ADMCF340BST, ADMCF340 Datasheet

DashDSPTM 64-Lead Flash Mixed-Signal DSP

a

TARGET APPLICATIONS
Refrigerator and Air Conditioner Compressors,

Washing Machines

Industrial Variable Speed Drives, HVAC

MOTOR TYPES
Permanent Magnet Synchronous Motors (PMSM),

Brushless DC Motors (BDCM), AC Induction Motors
(ACIM), Switched Reluctance Motors (SRM)

FEATURES
20 MHz Fixed-Point DSP Core

Single Cycle Instruction Execution (50 ns)
ADSP-21xx Family Code Compatibility
Independent Computational Units

ALU
Multiplier/Accumulator

Barrel Shifter
Multifunction Instructions
Single Cycle Context Switch
Powerful Program Sequencer

Zero Overhead Looping

Conditional Instruction Execution
Two Independent Data Address Generators

with Enhanced Analog Front End

ADMCF340

Memory Configuration

512  16-Bit Data Memory RAM
512  24-Bit Program Memory RAM
4K  24-Bit Program Memory ROM
4K  24-Bit Total Program FLASH Memory

Three Independent FLASH Memory Sectors

3584  24-Bit, 256  24-Bit, 256  24-Bit
Low Cost Pin-Compatible ROM Option
16-Bit Watchdog Timer
Programmable 16-Bit Internal Timer with Prescaler
Two Double Buffered Serial Ports with SPI Mode

Support
Integrated Power On Reset Function
Three Phase 16-Bit PWM Generation Unit

16-Bit Center-Based PWM Generator

Programmable PWM Pulsewidth

Edge Resolution of 50 ns

Programmable Narrow Pulse Deletion

153 Hz Minimum Switching Frequency

Double/Single Update Mode Control

Individual Enable and Disable for Each PWM

Output

High Frequency Chopping Mode for

Transformer-Coupled Gate Drives

FUNCTIONAL BLOCK DIAGRAM

ADSP-21xx BASE

ARCHITECTURE

DATA

ADDRESS

GENERATORS

DAG 1 DAG 2

ARITHMETIC UNITS

DashDSP is a trademark of Analog Devices, Inc.

MACALU

PROGRAM

SEQUENCER

PROGRAM MEMORY ADDRESS

DATA MEMORY ADDRESS

PROGRAM MEMORY DATA

DATA MEMORY DATA

SHIFTER

POR

MEMORY BLOCK

PROGRAM

ROM

4K  24

PROGRAM

RAM

512  24

TIMER

REV. 0

Information furnished by Analog Devices is believed to be accu­rate and reliable. However, no responsibility is assumed by
Analog Devices for its use, nor for any infringements of patents
or other rights of third parties that may result from its use. No
license is granted by implication or otherwise under any patent
or patent rights of Analog Devices.

(continued on page 8)

MOTOR CONTROL PERIPHERALS

I

SENSE

AND TRIP

SHA

TIMERS

2  16-BIT

AUX

PWM

225

3

AMP

16-BIT

THREE-

PHASE

PWM

WATCH-

DOG

TIMER

6

PROGRAM

FLASH

4K  24

DATA

MEMORY

512  16

SERIAL PORT

SPORT 0

SPORT 1

7

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: [phone]www.analog.com
Fax: [phone] © Analog Devices, Inc., 2002

ADC SUBSYSTEM

V

ANALOG

REF

2.5V

INPUTS

PIO

10

ADMCF340

(VDD = 5%, GND = 0 V, TA = –40C to +85C, CLKIN = 10 MHz, unless

ANALOG-TO-DIGITAL CONVERTER

Parameter Min Typ Max Unit Conditions/Comments

Signal Input 0.3 3.5 V VAUX0, VAUX1, VAUX2
Resolution
Linearity Error
Zero Offset
Comparator Delay 600 ns
ADC High Level Input Current
ADC Low Level Input Current

NOTES

1

Resolution varies with PWM switching frequency (double update mode) 78.1 kHz = 8 bits, 4.9 kHz = 12 bits.

2

2.44 kHz sample frequency, VAUX0, VAUX1, VAUX2

3

Extrapolated point outside of operating range. 2.44 kHz sample frequency

Specifications subject to change without notice.

1

2

3

2

2

–32 0 +7 mV

–10 µAV

otherwise noted.)

12 Bits

3 4 Bits

10 µAV

= 3.5 V

IN

= 0.0 V

IN

I

AMPLIFIER–TRIP

SENSE

Parameter Min Typ Max Unit Conditions/Comments

Signal Operating Range –400 +400 mV

I

SENSE

I

Gain –2.6 –2.51 –2.34 % VIN = –400 mV to +400 mV

SENSE

Gain Channel Matching 5.5 % VIN = –400 mV to +400 mV

I

SENSE

I

Gain Stability

SENSE

I

Linearity

SENSE

Internal Offset Voltage

I

SENSE

I

Internal Offset Stability

SENSE

I

Signal-to-Noise Ratio (SNR)

SENSE

Signal-to-Noise Ratio Less Distortion 54 dB

I

SENSE

3

(SNR)
I

Total Harmonic Distortion

SENSE

Input Current –200 +10 µAV

I

SENSE

I

Input Resistance 11.5 kΩ

SENSE

1

2

2

2

3

3

89 Bits

1.68 1.87 2.1 V

0.8 % VIN = –400 mV to +400 mV

2.1 %
51 dB

–40 dB
–53 dB

= –400 mV to +400 mV

IN

TRIP Threshold Low –690 –430 mV
TRIP Threshold High 430 690 mV
TRIP Minimum Pulsewidth

NOTES

1

Variation of gain with VDD and temperature

2

VIN = –400 mV to +400 mV.

3

fIN = 1 kHz sine wave, VIN = –400 mV to +400 mV, fS = 4 kHz.

4

High or low trip threshold

CURRENT SOURCE

4

5 µs

1

Parameter Min Typ Max Unit Conditions/Comments

Programming Resolution 3 Bits
Tuned Current

NOTES

1

For ADC calibration

2

0.3 V to 3.5 V I

2

CONST

91 100 109 µA

voltage

–2–

REV. 0

ADMCF340

VOLTAGE REFERENCE

Parameter Min Typ Max Unit Conditions/Comments

Voltage Level (V

)2.44 2.50 2.55 V –40°C to +85°C

REF

Drift 110 ppm/°C

Specifications subject to change without notice.

POWER-ON RESET

Parameter Min Typ Max Unit Conditions/Comments

Reset Threshold 3.20 3.65 4.10 V
Hysteresis 100 mV
Reset Active Timeout Period 3.2

*216 CLKOUT cycles

Specifications subject to change without notice.

*

ms

ELECTRICAL CHARACTERISTICS

Symbol Parameter Min Typ Max Unit Conditions/Comments

V

IL

V

IH

V

IL

V

IH

V

OL

V

OL

V

OH

I

IL

I

IL

I

IH

I

IH

I

IH

I

OZH

I

OZL

I

DD

I

DD

NOTES

1

PWMPOL and PWMSR Pins only

2

Output pins PORTA0–PORTA8, PORTB0–PORTB15, AH, AL, BH, BL, CH, CL

3

XTAL Pin

4

Internal pull-up, RESET

5

Internal pull-down, PWMTRIP, PORTA0–PORTA8, PORTB0–PORTB15

6

Three stateable pins, DT1, RFS1, TFS1, SCLK1

7

Outputs not switching

Specifications subject to change without notice.

Low Level Input Voltage 0.8 V
High Level Input Voltage 2 V
Low Level Input Voltage
High Level Input Voltage 2.60 V
Low Level Output Voltage
Low Level Output Voltage
High Level Output Voltage 4 V I
Low Level Input Current RESET Pin
Low Level Input Current –10 µAV
High Level Input Current RESET Pin
High Level Input Current
High Level Input Current 10 µAV
High Level Three-State Leakage Current
Low Level Three-State Leakage Current6–10 µAV
Supply Current (Idle)
Supply Current (Dynamic)

1

2

3

4

4

5

7

7

–100 µAV

6

1.75 V

0.4 V I

0.8 V I

30 µAV
100 µAV

100 µAV

55 mA V
135 mA V

2 mA

OL =

= 2 mA

OL

= 0.5 mA

OH

= 0 V

IN

= 0 V

IN

= V

IN

= V

IN

= V

IN

= V

IN

= 0 V

IN

= 5.25 V

DD

= 5.25 V

DD

DD

DD

DD

DD

REV. 0

–3–

ADMCF340

TIMING PARAMETERS

Parameter Min Max Unit

Clock Signals

Signal TCK is defined as 0.5 t
a frequency equal to half the instruction rate; a 10 MHz input clock (which is
equivalent to 100 ns) yields a 50 ns processor cycle (equivalent to 20 MHz).
When T

values are within the range of 0.5 t

CK

substituted for all relevant timing parameters to obtain specification value as
in the following example:

t T ns ns ns ns

=−=×−=05 10 05 50 10 15..

CKH CK

Timing Requirements:

t

CKIN

t

CKIL

t

CKIH

CLKIN Period 100 150 ns
CLKIN Width Low 20 ns
CLKIN Width High 20 ns

Switching Characteristics:

t

CKL

t

CKH

t

CKOH

CLKOUT Width Low 0.5 TCK – 10 ns
CLKOUT Width High 0.5 TCK – 10 ns
CLKIN High to CLKOUT High 0 20 ns

Control Signals

Timing Requirement:

t

RSP

RESET Width Low 5 TCK* ns

PWM Shutdown Signals

Timing Requirement:

t

PWMTPW

*Applies after power-up sequence is complete.

Specifications subject to change without notice.

PWMTRIP Width Low T

. The ADMCF340 uses an input clock with

CKIN

period, they should be

CKIN

CK

ns

CLKIN

CLKOUT

t

CKIN

t

CKIL

t

CKL

Figure 1. Clock Signals

t

t

CKOH

CKH

t

CKIH

–4–

REV. 0

ADMCF340

TIMING PARAMETERS

Parameter Min Max Unit

Serial Ports

Timing Requirements:

t

SCK

t

SCS

t

SCH

t

SCP

Switching Characteristics:
t

CC

t

SCDE

t

SCDV

t

RH

t

RD

t

SCDH

t

SCDD

t

TDE

t

TDV

t

RDV

Specifications subject to change without notice.

SCLK Period 100 ns
DR/TFS/RFS Setup before SCLK Low 15 ns
DR/TFS/RFS Hold after SCLK Low 20 ns
SCLKIN Width 40 ns

CLKOUT High to SCLK

OUT

0.25 T

0.25 TCK + 20 ns

CK

SCLK High to DT Enable 0 ns
SCLK High to DT Valid 30 ns
TFS/RFS
TFS/RFS

Hold after SCLK High 0 ns

OUT

Delay from SCLK High 30 ns

OUT

DT Hold after SCLK High 0 ns
SCLK High to DT Disable 30 ns
TFS (Alt) to DT Enable 0 ns
TFS (Alt) to DT Valid 25 ns
RFS (Multichannel, Frame Delay Zero) to DT Valid 30 ns

CLKOUT

SCLK

DR

RFS
TFS

RFS

OUT

TFS

OUT

DT

TFS

(ALTERNATE

FRAME MODE)

(MULTICHANNEL MODE,

FRAME DELAY 0 [MFD = 0])

RFS

t

CC

IN

IN

t

SCDE

t

t

RH

TDE

t

t

RD

SCDV

t

TDV

t

RDV

t

CC

t

SCDD

t

t

t

SCS

SCH

t

SCDH

SCP

t

SCK

t

SCP

Figure 2. Serial Port Timing

REV. 0

–5–

ADMCF340

WARNING!

ESD SENSITIVE DEVICE

ABSOLUTE MAXIMUM RATINGS*

Supply Voltage (VDD) . . . . . . . . . . . . . . . . . . –0.3 V to +7.0 V

Supply Voltage (AV

Input Voltage . . . . . . . . . . . . . . . . . . . . –0.3 V to V

Output Voltage Swing . . . . . . . . . . . . . –0.3 V to V

) . . . . . . . . . . . . . . . . . –0.3 V to +7.0 V

DD

+ 0.3 V

DD

+ 0.3 V

DD

Operating Temperature Range (Ambient) . . . –40°C to +85°C

Storage Temperature Range . . . . . . . . . . . . –65°C to +150°C

Lead Temperature (5 sec) . . . . . . . . . . . . . . . . . . . . . . . 280°C

*Stresses greater than those listed may cause permanent damage to the device.

These are stress ratings only; functional operation of the device at these or any
other conditions greater than those indicated in the operational sections of this
specification is not implied. Exposure to absolute maximum rating conditions for
extended periods may affect device reliability.

1

AGND

2

DGND1

3

RESET

4

PB6

5

CH

6

PB7

7

PB8

8

CL

9

PB9

10

PB10

11

BH

12

PB11

13

PB12

14

BL

15

NC

16

NC

NC = NO CONNECT

PIN CONFIGURATION

NC

ICONST

VAUX7

VAUX2

VAUX6

VAUX1

VAUX5

VAUX0

VAUX4

61

59

60

ADMCF340

20

22

21

PB14ALPB15

58

57

56

TOP VIEW

(Not to Scale)

23

24

25

2

DV

PA8/(AUX0/CLKOUT)

PA7/(UX1/PWMSYNC)

63

64

PIN 1
IDENTIFIER

18

17

NC

AH

62

19

PB13

55

26

DD

SENSE1

I

V1

54

53

27

28

DGND2

PWMSR

SENSE2

SENSE3

I

V2

I

V3

50

52

51

31

29

30

PA6/DR1

PWMPOL

PA5/(FL1/DT1)

PA4(SCLK1/SCLK0)

PWMTRIP

49

48

47

46

45

44

43

42

41

40

39

38

37

36

35

34

33

32

PA3/TFS0

AV

DD

DVDD1

XTAL

NC

CLKIN

NC

PB5

PB4

PA0/DR0

PB3

PB2

PA1/DT0

PB1

PB0

PA2/RFS0

NC

ORDERING GUIDE

Temperature Instruction Package Package

Model Range Rate Description Option

ADMCF340BST –40°C to +85°C 20 MHz 64-Lead Thin Plastic Quad Flatpack ST-64

(LQFP)

ADMCF340-EVALKIT N/A N/A Development Tool Kit

CAUTION

ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily
accumulate on the human body and test equipment and can discharge without detection. Although
the ADMCF340 features proprietary ESD protection circuitry, permanent damage may occur on
devices subjected to high energy electrostatic discharges. Therefore, proper ESD precautions are
recommended to avoid performance degradation or loss of functionality.

–6–

REV. 0

PIN FUNCTION DESCRIPTIONS

ADMCF340

Pin Pin
No. Mnemonic Type

1 AGND GND
2 DGND1 GND
3 RESET D_IN
4 PB6 D_I/O
5CH D_OUT
6 PB7 D_I/O
7 PB8 D_I/O
8CL D_OUT
9 PB9 D_I/O
10 PB10 D_I/O
11 BH D_OUT
12 PB11 D_I/O
13 PB12 D_I/O
14 BL D_OUT
15 NC No Connect
16 NC No Connect
17 NC No Connect
18 AH D_OUT
19 PB13 D_I/O
20 PB14 D_I/O
21 AL D_OUT
22 PB15 D_I/O
23 PA8/(AUX0/CLKOUT) D_I/O
24 PA7/(AUX1/PWMSYNC) D_I/O
25 DV

2SUP

DD

26 PWMSR D_IN
27 DGND2 GND
28 PA6/DR1 D_I/O
29 PA5/(FL1/DT1) D_I/O
30 PA4/(SCLK1/SCLK0) D_I/O
31 PWMPOL D-IN
32 PA3/TFS0 D_I/O

Pin Pin
No. Mnemonic Type

33 NC No Connect
34 PA2/RFS0 D_I/O
35 PB0 D_I/O
36 PB1 D_I/O
37 PA1/DT0 D_I/O
38 PB2 D_I/O
39 PB3 D_I/O
40 PA0/DR0 D_I/O
41 PB4 D_I/O
42 PB5 D_I/O
43 NC No Connect
44 CLKIN D_I/O
45 NC No Connect
46 XTAL A_OUT
47 DV
48 AV

1SUP

DD

DD

SUP

49 PWMTRIP D_IN
50 V3 A_IN
51 I

SENSE3

A_IN
52 V2 A_IN
53 I

SENSE2

A_IN
54 V1 A_IN
55 I

SENSE1

A_IN
56 VAUX4 A_IN
57 VAUX0 A_IN
58 VAUX5 A_IN
59 VAUX1 A_IN
60 VAUX6 A_IN
61 VAUX2 A_IN
62 VAUX7 A-IN
63 ICONST A_OUT
64 NC No Connect

PA is the abbreviation of PORTA; PB is the abbreviation of PORTB.

REV. 0

–7–

ADMCF340

(continued from page 1)

External PWMTRIP Pin
Switched Reluctance Motor Mode Selection Pin

PWM Polarity Selection Pin
Integrated 13-Channel ADC Subsystem
Three Bipolar I

Inputs with Programmable

SENSE

Sample and Hold Amplifier and Overcurrent

Protection (Usable as Three Dedicated Analog Inputs)
Three Simultaneous Converting Voltage Inputs
Seven Muxed Auxiliary Analog Inputs
Internal Voltage Reference (2.5 V)
Acquisition Synchronized to PWM Switching

Frequency
25-Pin Digital I/O Port
Bit Configurable as Input or Output
Change of State Interrupt Support
Two 16-Bit Auxiliary PWM Timers
Synthesized Analog Output
Programmable Frequency
0% to 100% Duty Cycle
Two Programmable Operation Modes
Independent Mode/Offset Mode

GENERAL DESCRIPTION

The ADMCF340 is a low cost, single-chip DSP-based controller
suitable for permanent magnet synchronous, ac induction, switched
reluctance, and brushless dc motors. The ADMCF340 integrates
a 20 MHz, fixed-point DSP core with a complete set of motor control
and system peripherals that permit fast, efficient development of
motor controllers.

The DSP core of the ADMCF340 is completely code compatible
with the ADSP-21xx DSP family and combines three computa-

tional units, data address generators, and a program sequencer.
The computational units comprise an ALU, a multiplier/accumu­lator (MAC), and a barrel shifter. There are special instructions
for bit manipulation, multiplication (x squared), biased rounding,
and global interrupt masking. The system peripherals are the
power-on reset circuit (POR), the watchdog timer, and two
synchronous serial ports. The serial ports are configurable,
and double buffered, with hardware support for UART, SCI,
and SPI port emulation. The ADMCF340 provides 512 × 24-bit
program memory RAM, 4K × 24-bit program memory ROM,
4K × 24-bit program FLASH memory, and 512 × 16-bit data
memory RAM. The user code will be stored and executed from
the flash memory. The program and data memory RAM can be
used for dynamic data storage or can be loaded through the
serial port from an external device as in other ADMCxx family
parts. The program memory ROM contains a monitor function
as well as useful routines for erasing, programming, and verifying
the flash memory.

The motor control peripherals of the ADMCF340 provide a 12-bit
analog data acquisition system with 13 analog input channels,
three dedicated I

functions (combining internal amplifi-

SENSE

cation, sampling, and overcurrent PWM shutdown features),
and an internal voltage reference. In addition, a three-phase,
16-bit, center-based PWM generation unit can be used to produce
high accuracy PWM signals with minimal processor overhead. The
ADMCF340 also contains two 16-bit auxiliary PWM timers
and 25 lines of programmable digital I/O.

Several functions such as the auxiliary PWM and the serial com­munication ports are multiplexed with the nine PORT A (9, PIO)
programmable input/output (PIO) pins. The other 16 pro­grammable digital I/O are dedicated. The pin functions can
be independently selected to allow maximum flexibility for
different applications.

DATA

ADDRESS

GENERATOR

#1

INPUT REGS

ALU

OUTPUT REGS

DATA

ADDRESS

GENERATOR

#2

INPUT REGS

OUTPUT REGS

MAC

INSTRUCTION

REGISTER

PM ROM

4K  24

PROGRAM

SEQUENCER

16

R BUS

14

14

24

BUS

EXCHANGE

16

INPUT REGS

SHIFTER

OUTPUT REGS

PM RAM
512  24

CONTROL

LOGIC

Figure 3. DSP Core Block Diagram

–8–

PMA BUS

DMA BUS

PMD BUS

DMD BUS

COMPANDING

CIRCUITRY

FLASH

PROGRAM

MEMORY

4K  24

TRANSMIT REG

RECEIVE REG

SERIAL

PORT

6

DM RAM
512  16

TIMER

REV. 0

ADMCF340

DSP CORE ARCHITECTURE OVERVIEW

Figure 3 is an overall block diagram of the DSP core of the

ADMCF340. The flexible architecture and comprehensive

instruction set allow the processor to perform multiple opera-

tions in parallel. In one processor cycle (50 ns with a 10 MHz

CLKIN) the DSP core can:

• Generate the next program address

• Fetch the next instruction

• Perform one or two data moves

• Update one or two data address pointers

• Perform a computational operation

This all takes place while the processor continues to:

•

Receive and transmit through the serial ports

•

Decrement the interval timer

•

Generate three-phase PWM waveforms for a power inverter

•

Generate two signals using the 16-bit auxiliary PWM timers

•

Acquire four analog signals

•

Decrement the watchdog timer

The processor contains three independent computational units:

the arithmetic and logic unit (ALU), the multiplier/accumulator

(MAC), and the shifter. The computational units process 16-bit

data directly and have provisions to support multiprecision com-

putations. The ALU performs a standard set of arithmetic and

logic operations as well as providing support for division primitives.

The MAC performs single-cycle multiply, multiply/add, and

multiply/subtract operations with 40 bits of accumulation. The

shifter performs logical and arithmetic shifts, normalization,

denormalization, and derive-exponent operations. The shifter

can be used to implement numeric format control efficiently,

including floating-point representations. The internal result (R)

bus directly connects the computational units so that the output

of any unit may be the input of any unit on the next cycle.

A powerful program sequencer and two dedicated data address

generators ensure efficient delivery of operands to these compu-

tational units. The sequencer supports conditional jumps and

subroutine calls and returns in a single cycle. With internal loop

counters and loop stacks, the ADMCF340 executes looped code

with zero overhead; no explicit jump instructions are required to

maintain the loop.

Two data address generators (DAGs) provide addresses for

simultaneous dual operand fetches from data memory and pro-

gram memory. Each DAG maintains and updates four address

pointers (I registers). Whenever the pointer is used to access

data (indirect addressing), it is post-modified by the value in

one of four modify (M) registers. A length value may be associated

with each pointer (L registers) to implement automatic modulo

addressing for circular buffers. The circular buffering feature is

also used by the serial ports for automatic data transfers to and

from on-chip memory. DAG1 generates only data memory address

and provides an optional bit-reversal capability. DAG2 may

generate either program or data memory addresses but has no

bit-reversal capability. Efficient data transfer is achieved with

the use of five internal buses:

•

Program memory address (PMA) bus

•

Program memory data (PMD) bus

•

Data memory address (DMA) bus

•

Data memory data (DMD) bus

•

Result (R) bus

Program memory can store both instructions and data, permitting
the ADMCF340 to fetch two operands in a single cycle—one from
program memory and one from data memory. The ADMCF340
can fetch an operand from on-chip program memory and the next
instruction in the same cycle. The ADMCF340 writes data from its
16-bit registers to the 24-bit program memory using the PX Register
to provide the lower eight bits. When it reads data (not instructions)
from 24-bit program memory to a 16-bit data register, the lower
eight bits are placed in the PX Register.

The ADMCF340 can respond to a number of distinct DSP core
and peripheral interrupts. The DSP interrupts comprise a serial port
receive interrupt, a serial port transmit interrupt, a timer inter­rupt, and two software interrupts. Additionally, the motor control
peripherals include two PWM interrupts and a PIO interrupt.

The serial port (SPORT0 ) provides a complete synchronous
serial interface with optional companding in hardware and a wide
variety of framed and unframed data transmit and receive modes of
operation. SPORT0 and SPORT1 can generate an internal
programmable serial clock or accept an external serial clock.

A programmable interval counter is also included in the DSP core
and can be used to generate periodic interrupts. A 16-bit count
register (TCOUNT) is decremented every n processor cycle,
where n – 1 is a scaling value stored in the 8-bit TSCALE Register.
When the value of the counter reaches zero, an interrupt is
generated and the count register is reloaded from a 16-bit period
register (TPERIOD).

The ADMCF340 instruction set provides flexible data moves
and multifunction (one or two data moves with a computation)
instructions. Each instruction is executed in a single 50 ns processor
cycle (for a 10 MHz CLKIN). The ADMCF340 assembly language
uses an algebraic syntax for ease of coding and readability. A
comprehensive set of development tools supports program
development. For further information on the DSP core, refer to
the ADSP-2100 Family User’s Manual, Third Edition, with
particular reference to the ADSP-2171.

SERIAL PORTS

The ADMCF340 incorporates two synchronous serial ports
(SPORT1 and SPORT0) for serial communication and multi­processor communication. SPORT1 is primarily intended for
the interfacing of the debugging tools and/or code booting from
an external serial memory.

The following is a brief list of capabilities of the ADMCF340
SPORTs.

•

SPORTs are bidirectional and have a separate, double­buffered transmit and receive section.

•

SPORTs can use an external serial clock or generate their
own serial clock internally.

•

SPORTs have independent framing for the receive and transmit
sections. Sections run in a frameless mode or with frame
synchronization signals internally or externally generated.
Frame synchronization signals are active high or inverted, with
either of two pulsewidths and timings.

•

SPORTs support serial data-word lengths from three bits to
16 bits and provide optional A-law and m-law companding
according to ITU (formerly CCITT) recommendation G.711.

•

SPORTs’ receive and transmit sections can generate unique
interrupts on completing a data-word transfer.

REV. 0

–9–

ADMCF340

•

SPORTs can receive and transmit an entire circular buffer of
data with only one overhead cycle per data-word. An interrupt
is generated after a data buffer transfer.

•

SPORT0 has one pin, SCLK0, shared with SPORT1. Dur­ing a boot phase (SPORT1 Boot Mode enabled by a bit in
the MODECTRL Register), the serial clock of SPORT1 is
externally available. The serial clock of SPORT0 is exter­nally available when the SPORT1 is configured in UART
Mode.

•

SPORT0 can be configured as SPI port (master mode only).
Refer to Table XI for more information. The clock phase and
polarity are programmable through the MODECTRL Register.
Refer to Table XI for pin configuration.

•

SPORT0 has a multichannel interface to selectively receive
and transmit a 24-word or 32-word time division multiplexed
serial bitstream.

•

SPORT1 is the default port for program/data memory boot
loading and for the development tools interface. The DT1/FL1
Pin can be configured as the SROM/E

The ADMCF340 is available in a 64-lead LQFP package.

PIN FUNCTION DESCRIPTION

Table I. Pin List

Pin Group # of Input/
Name Pins Output Function

PWMPOL 1 I PWM Polarity
PWMSR 1 I PWM Switched

RESET 1 I Processor Reset Input
SPORT1

SPORT0

CLKOUT

1

1

1

2 I/O Serial Port 1 Pins

5 I/O Serial Port 0 Pins

1

1

I/O Processor Clock

CLKIN, XTAL 2 I/O External Clock or

1

PORTA0–PORTA8
PORTB0–PORTB15 16 I/O Digital I/O Port Pins
AUX0–AUX1

1

9 I/O Digital I/O Port Pins

2O Auxiliary PWM

AH-CL 6 O PWM Outputs
PWMTRIP 1 I PWM Trip Signal
V1 to V3 3 I I
I

SENSE1 to ISENSE3

3I Analog Inputs
VAUX0-VAUX7 7 I Auxiliary Analog Inputs
ICONST 1 O ADC Constant

V

DD

3I Power Supply
GND 3 I Ground

NOTES

1

Multiplexed pins, individually selectable through PORTA_SELECT and
PORTA_DATA Registers.

2

SCLK1/SCLK0 multiplexed signals. Selectable through MODECTRL
Register Bit 4.

2

prom reset signal.

Reluctance Mode

(DT1/FL1, DR1)

(DT0, DR0, RFS0,
TFS0, SCLK1/
SCLK0

2

)

Output

Quart Crystal
Connection Point

Outputs

Inputs

SENSE

Current Source

INTERRUPT OVERVIEW

The ADMCF340 can respond to 34 different interrupt sources
with minimal overhead, seven of which are internal DSP core
interrupts and 27 are from the motor control peripherals. The seven
DSP core interrupts are SPORT1 receive (or IRQ0) and transmit
(or IRQ1), SPORT0 receive and transmit, the internal timer,
and two software interrupts. The motor control peripheral
interrupts are the 25 programmable I/Os and two from the PWM
(PWMSYNC pulse and PWMTRIP). All motor control interrupts
are multiplexed into the DSP core through the peripheral IRQ2
interrupt. The interrupts are internally prioritized and individually
maskable. A detailed description of the entire interrupt system of
the ADMCF340 is presented later, following a more detailed
description of each peripheral block.

MEMORY MAP

The ADMCF340 has two distinct memory types: program
and data. In general, program memory contains user code and
coefficients, while the data memory is used to store variables and
data during program execution. Three kinds of program memory are
provided on the ADMCF340: RAM, ROM, and FLASH. The
motor control peripherals are memory mapped into a region of the
data memory space starting at 0x2000. The complete program and
data memory maps are given in Tables II and III, respectively.

Table II. Program Memory Map

Memory

Address Range Type Function

0x0000–0x002F RAM Internal Vector Table
0x0030–0x01FF RAM User Program Memory
0x0200–0x07FF Reserved
0x0800–0x17FF ROM Reserved Program Memory
0x1800–0x1FFF Reserved
0x2000–0x20FF FLASH User Program Memory

Sector 0

0x2100–0x21FF FLASH User Program Memory

Sector 1

0x2200–0x2FFF FLASH User Program Memory

Sector 2

0x3000–0x3FFF Reserved

Table III. Data Memory Map

Memory

Address Range Type Function

0x0000–0x1FFF Reserved
0x2000–0x20FF Memory Mapped Registers
0x2100–0x37FF Reserved
0x3800–0x39FF RAM User Data Memory
0x3A00–0x3BFF RAM Reserved
0x3C00–0x3FFF Memory Mapped Registers

–10–

REV. 0

ADMCF340

FLASH MEMORY SUBSYSTEM

The ADMCF340 has 4K × 24-bit of user-programmable, nonvola­tile flash memory. A flash programming utility is provided with the
development tools that performs the basic device programming
operations: erase, program, and verify.

The flash memory array is portioned into three asymmetrically
sized sectors of 256 words, 256 words, and 3,584 words, labeled
Sector 0, Sector 1, and Sector 2, respectively. These sectors are
mapped into external program memory address space.

Four flash memory interface registers are connected to the DSP.
These 16-bit registers are mapped into the register area of data
memory space. They are named Flash Memory Control Register
(FMCR), Flash Memory Address Register (FMAR), Flash
Memory Data Register Low (FMDRL), and Flash Memory Data
Register High (FMDRH). These registers are diagrammed later in
this data sheet. They are used by the flash memory programming
utility. The user program may read these registers but should not
modify them directly. The flash programming utility provides a
complete interface to the flash memory.

Note: From the point of view of 2171 core, the flash memory
is placed externally. It means the core accesses them through
an external memory interface that multiplexes the program
memory and data memory buses into a single external bus.
Therefore, if more than one external transfer must be made in
the same instruction, there will be at least an overhead cycle
required. For more details, see Application Note ANF32X-65
Guidelines to Transfer Code from ADMCF32x to ADMC32x.

Special Flash Registers

The flash module has four nonvolatile 8-bit registers called Special
Flash Registers (SFRs) that are accessible independently of
the main flash array via the flash programming utility. These
registers are for general-purpose, nonvolatile storage. When
erased, the Special Flash Registers contain all “0s.” To read
Special Flash Registers from the user program, call the read_reg
routine contained in the ROM. Refer to the ADMCF34x DSP
Motor Controller Developers’ Reference Manual for an example.

Boot-from-Flash Code

A security feature is available in the form of a code that when set
causes the processor to execute the program in flash memory at
power-up or reset. In this mode, the flash programming utility
and debugger are unable to communicate with the ADMCF340.
Consequently, the contents of the flash memory can be neither
programmed nor read.

The boot-from-flash code may be set via the flash programming
utility when the user’s program is thoroughly tested and loaded
into flash program memory at Address 0x2200. The user’s pro­gram must contain a mechanism for clearing the boot-from-flash
code if reprogramming the flash memory is desired. The only
way to clear boot-from-flash is from within the user program, by
calling the flash_init or auto_erase_reg routines that are included in the
ROM. The user program must be signaled in some way to call the
necessary routine to clear the boot-from-flash code. An example
would be to detect a high level on a PIO pin during startup initial­ization and then call the flash_init or auto-erase-reg routine.
The flash_init routine will erase the entire user program in

flash memory before clearing the boot-from-flash code, thus
ensuring the security of the user program. If security is not a
concern, the auto_erase_reg routine can be used to clear the
boot-from-flash code while leaving the user program intact.

Refer to the ADMCF34x DSP Motor Controller Developers’
Reference Manual for further instructions and an example of
using the boot-from-flash code.

FLASH PROGRAM BOOT SEQUENCE

On power-up or reset, the processor begins instruction execution
at Address 0x0800 of internal program ROM. The ROM monitor
program that is located there checks the boot-from-flash code. If
that code is set, the processor jumps to location 0x2200 in external
flash program memory, where it expects to find the user’s
application program.

If the boot-from-flash code is not set, the monitor attempts to
boot from an external device as described in the ADMCF34x

DSP Motor Controller Developers’ Reference Manual.

SYSTEM INTERFACE

Figure 4 shows a basic system configuration for the ADMCF340
with an external crystal.

22pF

10MHz

22pF

Figure 4. Basic System Configuration

Clock Signals

CLKOUT

ADMCF340

RESET

XTAL

CLKIN

The ADMCF340 can be clocked either by a crystal or a TTL
compatible clock signal. For normal operation, the CLKIN
input cannot be halted, changed during operation, or operated
below the specified minimum frequency. If an external clock is
used, it should be a TTL compatible signal running at half the
instruction rate. The signal is connected to the CLKIN pin of
the ADMCF340. In this mode, with an external clock signal,
the XTAL Pin must be left unconnected. The ADMCF340 uses
an input clock with a frequency equal to half the instruction
rate; a 10 MHz input clock yields a 50 ns processor cycle (which is
equivalent to 20 MHz). Normally, instructions are executed
in a single processor cycle. All device timing is relative to the
internal instruction rate that is indicated by the CLKOUT
signal when enabled.

Because the ADMCF340 includes an on-chip oscillator feedback
circuit, an external crystal may be used instead of a clock source,
as shown in Figure 2. The crystal should be connected across the
CLKIN and XTAL Pins with two capacitors (see Figure 2). A
parallel-resonant, fundamental frequency, microprocessor-grade
crystal should be used. A clock output signal (CLKOUT) is
generated by the processor at the processor’s cycle rate of twice
the input frequency.

REV. 0

–11–

ADMCF340

Reset

The ADMCF340 DSP core and peripherals must be correctly
reset when the device is powered up to assure proper unitization.
The ADMCF340 contains an integrated power-on-reset (POR)
circuit that provides a complete system reset on power-up and
power-down. The POR circuit monitors the voltage on the
ADMCF340 V
in reset while V
When this voltage is exceeded, the ADMCF340 is held in reset
for an additional 2
this time (T

Pin and holds the DSP core and peripherals

DD

is less than the threshold voltage level, V

DD

16

DSP clock cycles (T

), the supply voltage must reach the recommended

RST

in Figure 5). During

RST

RST

.

operating condition. On power-down, when the voltage on the

Pin falls below V

V

DD

RST –VHYST

, the ADMCF340 will be

reset. Also, if the external RESET Pin is actively pulled low
at any time after power-up, a complete hardware reset of the
ADMCF340 is initiated.

V

RST

V

RESET

DD

T

RST

V

V

RST

HYST

–

Figure 5. Power-On Reset Operation

The ADMCF340 sets all internal stack pointers to the empty
stack condition, masks all interrupts, clears the MSTAT Register,
and performs a full reset of all the motor control peripherals.
Following a power-up, it is possible to initiate a DSP core and
motor control peripheral reset by pulling the RESET Pin low.
The RESET signal must be the minimum pulsewidth specification,

. Following the reset sequence, the DSP core starts executing

t

RSP

code from the internal PM ROM located at 0x0800.

DSP Control Registers

The DSP core has a system control register, SYSCNTL, memory­mapped at DM (0x3FFF). SPORT1 must be configured as a
serial port by setting Bit 10. SPORT0 and SPORT1 are enabled
by setting Bit 11 and Bit 12.

The DSP core has a wait state control register, MEMWAIT,
memory-mapped at DM (0x3FFE). The default value of this
register is 0xFFFF. For proper operation of the ADMCF340,
this register must always contain the value 0x8000. This value
sets the minimum access time to the program memory.

The configurations of both the SYSCNTL and MEMWAIT Reg­isters of the ADMCF340 are shown at the end of the data sheet.

THREE-PHASE PWM CONTROLLER
Overview

The PWM generator block of the ADMCF340 is a flexible,
programmable, three-phase PWM waveform generator that can
be programmed to generate the required switching patterns to
drive a three-phase voltage source inverter for ac induction motors
(ACIM) or permanent magnet synchronous motors (PMSM).
In addition, the PWM block contains special functions that
considerably simplify the generation of the required PWM
switching patterns for control of electronically commutated
motors (ECM), brushless dc motors (BDCM), or switched
reluctance motors (SRM).

The six PWM output signals consist of three high side drive
signals (AH, BH, and CH) and three low side drive signals (AL,
BL, and CL). The switching frequency, dead time, and minimum
pulsewidths of the generated PWM patterns are programmable
using, respectively, the PWMTM, PWMDT, and PWMPD
registers. In addition, three registers (PWMCHA, PWMCHB,
and PWMCHC) control the duty cycles of the three pairs of
PWM signals.

PWM CONFIGURATION

REGISTERS

PWMTM (15...0)
PWMDT (9...0)
PWMPD (9...0)
PWMSYNCWT (7...0)
MODECTRL (6)

THREE-PHASE

PWM TIMING

CLK RESETSYNC

PWMSYNC

TO INTERRUPT
CONTROLLER

PWMTRIP

PWM DUTY CYCLE

REGISTERS

PWMCHA (15...0)
PWMCHB (15...0)
PWMCHC (15...0)

UNIT

PWMSEG (8...0)

OUTPUT

CONTROL

UNIT

SYNC

OR

PWMSWT (0)

PWM SHUTDOWN CONTROLLER

PWMGATE (9...0)

CURRENT

Figure 6. Overview of the PWM Controller of the ADMCF340

GATE

DRIVE

UNIT

CLK

OVER

TRIP

CLKOUT

ANALOG BLOCK

AH
AL
BH

BL
CH
CL

PWMTRIP

I

SENSE1

I

SENSE2

I

SENSE3

–12–

REV. 0