ATMEL AT91SAM7L64 User Manual

BDTIC www.bdtic.com/ATMEL

Features

• Incorporates the ARM7TDMI

– High-performance 32-bit RISC Architecture
– High-density 16-bit Instruction Set
– Leader in MIPS/Watt
– EmbeddedICE

• Internal High-speed Flash

– 128 Kbytes (AT91SAM7L128), Organized in 512 Pages of 256 Bytes Single Plane
– 64 Kbytes (AT91SAM7L64), Organized In 256 Pages of 256 Bytes Single Plane
– Single Cycle Access at Up to 15 MHz in Worst Case Conditions
– 128-bit Read Access
– Page Programming Time: 4.6 ms, Including Page Auto Erase, Full Erase Time: 10 ms
– 10,000 Write Cycles, 10-year Data Retention Capability, Sector Lock Capabilities,

Flash Security Bit

– Fast Flash Programming Interface for High Volume Production

• Internal High-speed SRAM, Single-cycle Access at Maximum Speed

– 6 Kbytes

• 2 Kbytes Directly on Main Supply That Can Be Used as Backup SRAM

• 4 Kbytes in the Core

• Memory Controller (MC)

– Enhanced Embedded Flash Controller, Abort Status and Misalignment Detection

• Enhanced Embedded Flash Controller (EEFC)

– Interface of the Flash Block with the 32-bit Internal Bus
– Increases Performance in ARM and Thumb Mode with 128-bit Wide Memory

Interface

• Reset Controller (RSTC)

– Based on Zero-power Power-on Reset and Fully Programmble Brownout Detector
– Provides External Reset Signal Shaping and Reset Source Status

• Clock Generator (CKGR)

– Low-power 32 kHz RC Oscillator, 32 kHz On-chip Oscillator, 2 MHz Fast RC

Oscillator and one PLL

• Supply Controller (SUPC)

– Minimizes Device Power Consumption
– Manages the Different Supplies On Chip
– Supports Multiple Wake-up Sources

• Power Management Controller (PMC)

– Software Power Optimization Capabilities, Including Active and Four Low Power

Modes:

• Idle Mode: No Processor Clock

• Wait Mode: No Processor Clock, Voltage Regulator Output at Minimum

• Backup Mode: Voltage Regulator and Processor Switched Off

• Off (Power Down) Mode: Entire Chip Shut Down Except for Force Wake Up Pin
(FWUP) that Re-activates the Device. 100 nA Current Consumption.

• In Active Mode, Dynamic Power Consumption <30 mA at 36 MHz

– Three Programmable External Clock Signals
– Handles Fast Start Up

™

In-circuit Emulation, Debug Communication Channel Support

®

ARM® Thumb® Processor

AT91 ARM
Thumb-based
Microcontroller

AT91SAM7L128
AT91SAM7L64

Summary

Preliminary

NOTE: This is a summary document.

The complete document is available on
the Atmel website at www.atmel.com..

6257AS–ATARM–28-Feb-08

• Advanced Interrupt Controller (AIC)

– Individually Maskable, Eight-level Priority, Vectored Interrupt Sources
– Two External Interrupt Sources and One Fast Interrupt Source, Spurious Interrupt Protected

• Debug Unit (DBGU)

– Two-wire UART and Support for Debug Communication Channel interrupt, Programmable ICE Access Prevention

• Periodic Interval Timer (PIT)

– 20-bit Programmable Counter plus 12-bit Interval Counter

• Windowed Watchdog (WDT)

– 12-bit Key-protected Programmable Counter
– Provides Reset or Interrupt Signals to the System
– Counter may be Stopped While the Processor is in Debug State or in Idle Mode

• Real-time Clock (RTC)

– Two Hundred Year Calendar with Alarm
– Runs Off the Internal RC or Crystal Oscillator

• Three Parallel Input/Output Controllers (PIOA, PIOB, PIOC)

– Eighty Programmable I/O Lines Multiplexed with up to Two Peripheral I/Os
– Input Change Interrupt Capability on Each I/O Line
– Individually Programmable Open-drain, Pull-up resistor and Synchronous Output

• Eleven Peripheral DMA Controller (PDC) Channels

• One Segment LCD Controller

– Display Capacity of Forty Segments and Ten Common Terminals
– Software Selectable LCD Output Voltage (Contrast)

• Two Universal Synchronous/Asynchronous Receiver Transmitters (USART)

– Individual Baud Rate Generator, IrDA® Infrared Modulation/Demodulation
– Support for ISO7816 T0/T1 Smart Card, Hardware Handshaking, RS485 Support
– Manchester Encoder/Decoder
– Full Modem Line Support on USART1

• One Master/Slave Serial Peripheral Interface (SPI)

– 8- to 16-bit Programmable Data Length, Four External Peripheral Chip Selects

• One Three-channel 16-bit Timer/Counter (TC)

– Three External Clock Inputs, Two Multi-purpose I/O Pins per Channel
– Double PWM Generation, Capture/Waveform Mode, Up/Down Capability

• One Four-channel 16-bit PWM Controller (PWMC)

• One Two-wire Interface (TWI)

®

– Master, Multi-Master and Slave Mode Support, All Atmel
– General Call Supported in Slave Mode

Two-wire EEPROMs and I2C compatible Devices Supported

• One 4-channel 10-bit Analog-to-Digital Converter, Four Channels Multiplexed with Digital I/Os

• SAM-BA

• IEEE

®

Boot Assistant
– Default Boot Program
– Interface with SAM-BA Graphic User Interface
– In Application Programming Function (IAP)

®

1149.1 JTAG Boundary Scan on All Digital Pins

• Four High-current Drive I/O lines, Up to 4 mA Each

• Power Supplies

– Embedded 1.8V Regulator, Drawing up to 60 mA for the Core with Programmable Output Voltage
– Single Supply 1.8V - 3.6V

• Fully Static Operation: Up to 36 MHz at 85°C, Worst Case Conditions

• Available in a 128-lead LQFP Green and a 144-ball LFBGA Green Package

2

AT91SAM7L128/64 Preliminary

6257AS–ATARM–28-Feb-08

1. Description

AT91SAM7L128/64 Preliminary

The AT91SAM7L128/64 are low power members of Atmel’s Smart ARM Microcontroller family
based on the 32-bit ARM7

• AT91SAM7L128 features a 128 Kbyte high-speed Flash and a total of 6 Kbytes SRAM.

• AT91SAM7L64 features a 64 Kbyte high-speed Flash and a total of 6 Kbytes SRAM.

They also embed a large set of peripherals, including a Segment LCD Controller and a complete
set of system functions minimizing the number of external components.

These devices provide an ideal migration path for 8-bit microcontroller users looking for addi­tional performance, extended memory and higher levels of system integration with strong
constraints on power consumption.

Featuring innovative power reduction modes and ultra-low-power operation, the
AT91SAM7L128/64 is tailored for battery operated applications such as calculators, toys,
remote controls, medical devices, mobile phone accessories and wireless sensors.

The embedded Flash memory can be programmed in-system via the JTAG-ICE interface or via
a parallel interface on a production programmer prior to mounting. Built-in lock bits and a secu­rity bit protect the firmware from accidental overwrite and preserve its confidentiality.

The AT91SAM7L128/64 system controller includes a reset controller capable of managing the
power-on sequence of the microcontroller and the complete system. Correct device operation
can be monitored by a built-in brownout detector and a watchdog running off an integrated
oscillator.

™

RISC processor and high-speed Flash memory.

By combining the ARM7TDMI processor with on-chip Flash and SRAM, and a wide range of
peripheral functions, including USART, SPI, External Bus Timer Counter, RTC and Analog-to­Digital Converters on a monolithic chip, the AT91SAM7L128/64 microcontroller is a powerful
device that provides a flexible, cost-effective solution to many embedded control applications.

6257AS–ATARM–28-Feb-08

3

2. Block Diagram

Figure 2-1. AT91SAM7L128/64 Block Diagram

TDI
TDO
TMS
TCK

JTAGSEL

TST

FIQ

IRQ0-IRQ1

PCK0-PCK2

CLKIN

PLLRC

XIN

XOUT

VDDIO1

VDDIO1

NRST

NRSTB

FWUP

System Controller

PIO

PLL

OSC

32k RCOSC

BOD

POR

VDDIO1

JTAG

SCAN

2 MHz RCOSC

AIC

PMC

Supply

Controller

RTC

ICE

ARM7TDMI

Processor

Memory Controller

Embedded

Flash

Controller

Abort

Status

Peripheral Bridge

Peripheral Data

Controller

11 Channels

APB

Address
Decoder

Misalignment

Detection

Charge

Pump

LCD

Voltage

Regulator

1.8 V

Voltage

Regulator

SRAM

2 Kbytes( Back-up)

4 Kbytes (Core)

Flash

64/128 Kbytes

ROM

(12 Kbytes)

Fast Flash

Programming

Interface

SAM-BA

CAPP1
CAPM1

CAPP2
CAPM2

VDDINLCD
VDD3V6

VDDLCD

VDDIO2

VDDIO1
GND
VDDOUT

VDDCORE
VDDIO2

VDDCORE

ERASE

PGMRDY
PGMNVALID
PGMNOE
PGMCK
PGMM0-PGMM3
PGMD0-PGMD15
PGMNCMD
PGMEN0-PGMEN2

DRXD
DTXD

SEG00-SEG39

COM0-COM9

RXD0

TXD0

SCK0

RTS0
CTS0

RXD1

TXD1

SCK1

RTS1

CTS1
DCD1
DSR1
DTR1

RI1

PIO

PIO

PIT

WDT

PDC

DBGU

PDC

PIOA (26 IOs)

PIOB (24 IOs)

PIOC (30 IOs)

LCD Controller

USART0

USART1

PDC

PDC
PDC

PDC

Timer Counter

PDC

PDC
PDC

PDC
PDC

PWMC

TC0

TC1

TC2

TWI

SPI

ADC

PIO

PWM0
PWM1
PWM2
PWM3
TCLK0
TCLK1
TCLK2
TIOA0
TIOB0

TIOA1
TIOB1

TIOA2
TIOB2

TWD
TWCK

NPCS0
NPCS1
NPCS2
NPCS3
MISO
MOSI
SPCK
ADTRG
AD0
AD1
AD2
AD3

ADVREF

4

AT91SAM7L128/64 Preliminary

6257AS–ATARM–28-Feb-08

AT91SAM7L128/64 Preliminary

3. Signal Description

Table 3-1. Signal Description List

Active

Signal Name Function Type

Power

VDDIO1

VDDOUT Voltage Regulator Output Power
VDDCORE Core Power Supply Power Connected externally to VDDOUT
VDDINLCD Charge Pump Power Supply Power From 1.80V to 3.6V
VDD3V6 Charge Pump Output Power
VDDLCD LCD Voltage Regulator Power Supply Power

VDDIO2

CAPP1 Charge pump capacitor 1 Power
CAPM1 Charge pump capacitor 1 Power
CAPP2 Charge pump capacitor 2 Power
CAPM2 Charge pump capacitor 2 Power
FWUP Force Wake-up Input Low VDDIO1 Needs external Pull-up.

WKUP0-15

GND Ground Ground

XIN 32 kHz Oscillator Input Input VDDIO1
XOUT 32 kHz Oscillator Output Output VDDIO1
CLKIN Main Clock input Input VDDIO1 Should be tied low when not used.
PCK0 - PCK2 Programmable Clock Output Output
PLLRC PLL Filter Input VDDCORE

PLLRCGND PLL RC Filter Ground Power

TCK Test Clock Input VDDIO1 No internal pull-up resistor
TDI Test Data In Input VDDIO1 No internal pull-up resistor
TDO Test Data Out Output VDDIO1
TMS Test Mode Select Input VDDIO1 No internal pull-up resistor
JTAGSEL JTAG Selection Input VDDIO1 Internal Pull-down resistor

ERASE

I/O Lines (PIOC) and Voltage Regulator
Power Supply

LCD Voltage Regulator Output
and
LCD I/O Lines Power Supply (PIOA and

PIOB)

Wake-up inputs used in Backup mode and
Fast Start-up inputs in Wait mode

Clocks, Oscillators and PLLs

Flash and NVM Configuration Bits Erase
Command

Power From 1.80V to 3.6V

Power 1.80V to 3.6V

Input VDDIO1

ICE and JTAG

Flash Memory

Input High VDDIO1 Internal Pull-down (15 k

Level

Vol tag e

Reference Comments

Capacitor needed between CAPP1
and CAPM1.

Capacitor needed between CAPP2
and CAPM2.

Must not be connected to external
Ground.

Ω) resistor

6257AS–ATARM–28-Feb-08

5

Table 3-1. Signal Description List (Continued)

Active

Signal Name Function Type

Reset/Test

NRST Microcontroller Reset I/O Low VDDIO1 Internal Pull-up (100 kΩ) resistor
TST Test Mode Select Input High VDDIO1 Internal Pull-down (15 kΩ) resistor
NRSTB Asynchronous Master Reset Input Low VDDIO1 Internal Pull-up (15 k

Debug Unit

DRXD Debug Receive Data Input
DTXD Debug Transmit Data Output

AIC

IRQ0 - IRQ1 External Interrupt Inputs Input
FIQ Fast Interrupt Input Input

PIO

PA0 - PA25 Parallel IO Controller A I/O VDDIO2 Pulled-up input at reset
PB0 - PB23 Parallel IO Controller B I/O VDDIO2 Pulled-up input at reset
PC0 - PC29 Parallel IO Controller C I/O VDDIO1 Pulled-up input at reset

USART

SCK0 - SCK1 Serial Clock I/O
TXD0 - TXD1 Transmit Data I/O
RXD0 - RXD1 Receive Data Input
RTS0 - RTS1 Request To Send Output
CTS0 - CTS1 Clear To Send Input
DCD1 Data Carrier Detect Input
DTR1 Data Terminal Ready Output
DSR1 Data Set Ready Input
RI1 Ring Indicator Input

Timer/Counter

TCLK0 - TCLK2 External Clock Inputs Input
TIOA0 - TIOA2 Timer Counter I/O Line A I/O
TIOB0 - TIOB2 Timer Counter I/O Line B I/O

PWM Controller

PWM0 - PWM3 PWM Channels Output

Serial Peripheral Interface

MISO Master In Slave Out I/O
MOSI Master Out Slave In I/O
SPCK SPI Serial Clock I/O
NPCS0 SPI Peripheral Chip Select 0 I/O Low
NPCS1-NPCS3 SPI Peripheral Chip Select 1 to 3 Output Low

Level

Vol tag e

Reference Comments

Ω) resistor

6

AT91SAM7L128/64 Preliminary

6257AS–ATARM–28-Feb-08

AT91SAM7L128/64 Preliminary

Table 3-1. Signal Description List (Continued)

Active

Signal Name Function Type

Two-Wire Interface

TWD Two-wire Serial Data I/O
TWCK Two-wire Serial Clock I/O

Analog-to-Digital Converter

AD0-AD3 Analog Inputs Input VDDCORE
ADTRG ADC Trigger Input
ADVREF ADC Reference Analog VDDCORE

Fast Flash Programming Interface

PGMEN0­PGMEN2

PGMM0­PGMM3

PGMD0­PGMD15

PGMRDY Programming Ready Output High VDDIO1
PGMNVALID Data Direction Output Low VDDIO1
PGMNOE Programming Read Input Low VDDIO1
PGMCK Programming Clock Input VDDIO1
PGMNCMD Programming Command Input Low VDDIO1

COM[9:0] Common Terminals Output VDDIO2
SEG[39:0] Segment Terminals Output VDDIO2

Programming Enabling Input VDDIO1

Programming Mode Input VDDIO1

Programming Data I/O VDDIO1

Segmented LCD Controller

Level

Vol tag e

Reference Comments

6257AS–ATARM–28-Feb-08

7

4. Package and Pinout

The AT91SAM7L128/64 is available in:

• 20 x 14 mm 128-lead LQFP package with a 0.5 mm lead-pitch

• 10 x 10 mm 144-ball LFBGA package with a 0.8 mm pitch.

The part is also available in die delivery.

4.1 128-lead LQFP Package Outline

Figure 4-1 shows the orientation of the 128-lead LQFP package.

A detailed mechanical description is given in the Mechanical Characteristics section of the prod­uct datasheet.

Figure 4-1. 128-lead LQFP Package Outline (Top View)

103

128

102

1

65

64

39

38

8

AT91SAM7L128/64 Preliminary

6257AS–ATARM–28-Feb-08

AT91SAM7L128/64 Preliminary

4.2 128-lead LQFP Package Pinout

Table 4-1. Pinout for 128-lead LQFP Package

1 TST 33 VDDLCD 65 PB21 97 PC10/PGMM3

2 VDDCORE 34 VDD3V6 66 PB22 98 PC11/PGMD0

3 PA0 35 CAPM2 67 PB23 99 PC12/PGMD1

4 PA1 36 CAPP2 68 GND 100 VDDCORE

5 PA2 37 CAPM1 69 ADVREF 101 PC13/PGMD2

6 PA3 38 CAPP1 70 AD3 102 PC14/PGMD3

7 PA4 39 VDDINLCD 71 AD2 103 PC15/PGMD4

8 PA5 40 GND 72 AD1 104 PC16/PGMD5

9 PA6 41 PB0 73 AD0 105 PC17/PGMD6

10 PA7 42 PB1 74 VDDOUT 106 PC18/PGMD7

11 PA8 43 PB2 75 VDDIO1 107 PC19/PGMD8

12 PA9 44 PB3 76 GND 108 PC20/PGMD9

13 PA10 45 PB4 77 PC28 109 PC21/PGMD10

14 GND 46 PB5 78 PC29 110 PC22/PGMD11

15 VDDIO2 47 PB6 79 NRST 111 PC23/PGMD12

16 PA11 48 PB7 80 ERASE 112 PC24/PGMD13

17 PA12 49 PB8 81 TCK 113 PC25/PGMD14

18 PA13 50 PB9 82 TMS 114 PC26/PGMD15

19 PA14 51 PB10 83 JTAGSEL 115 PC27

20 PA15 52 PB11 84 VDDCORE 116 TDI

21 PA16 53 PB12 85 VDDIO1 117 TDO

22 PA17 54 PB13 86 GND 118 FWUP

23 PA18 55 VDDIO2 87 PC0/PGMEN0 119 VDDIO1

24 PA19 56 GND 88 PC1/PGMEN1 120 GND

25 PA20 57 PB14 89 PC2/PGMEN2 121 PLLRC

26 PA21 58 PB15 90 PC3/PGMNCMD 122 PLLRCGND

27 PA22 59 PB16 91 PC4/PGMRDY 123 GND

28 VDDCORE 60 PB17 92 PC5/PGMNOE 124 VDDCORE

29 PA23 61 PB18 93 PC6/PGMNVALID 125 CLKIN

30 PA24 62 VDDCORE 94 PC7/PGMM0 126 NRSTB

31 PA25 63 PB19 95 PC8/PGMM1 127 XIN/PGMCK

32 VDDIO2 64 PB20 96 PC9/PGMM2 128 XOUT

6257AS–ATARM–28-Feb-08

9

4.3 144-ball LFBGA Package Outline

Figure 4-2 shows the orientation of the 144-ball LFBGA package.

A detailed mechanical description is given in the Mechanical Characteristics section of the prod­uct datasheet.

Figure 4-2. 144-ball LFBGA Package Outline (Top View)

Ball A1

12
11
10

9
8
7
6
5
4
3
2
1

ABCDEFGHJKLM

10

AT91SAM7L128/64 Preliminary

6257AS–ATARM–28-Feb-08

AT91SAM7L128/64 Preliminary

4.4 144-ball LFBGA Pinout

Table 4-2. SAM7L128/64 Pinout for 144-ball LFBGA Package

Pin Signal Name Pin Signal Name Pin Signal Name Pin Signal Name

A1 XOUT D1 PA6 G1 VDD3V6 K1 CAPM1

A2 XIN D2 PA5 G2 PA17 K2 VDDIO2

A3 VDDCORE D3 PA7 G3 PA16 K3 VDDIO2

A4 GND D4 NC G4 PA15 K4 PA25

A5 PLLRCGND D5 PC26/PGMD15 G5 GND K5 PB3

A6 PLLRC D6 PC25/PGMD14 G6 GND K6 PB10

A7 PC24/PGMD13 D7 PC21/PGMD11 G7 GND K7 PB13

A8 PC23//PGMD12 D8 PC18/PGMD7 G8 VDDIO1 K8 PB15

A9 PC17/PGMD6 D9 PC6/PGMNVALID G9 NRST K9 PB20

A10 NC D10 PC7/PGMM0 G10 TMS K10 VDDCORE

A11 PC14 D11 PC4/PGMRDY G11 ERASE K11 VDDCORE

A12 PC12 D12 PC3/PGMNCMD G12 VDDOUT K12 AD2

B1 PA1 E1 VDDIO2 H1 CAPM2 L1 CAPP1

B2 PA0 E2 PA10 H2 PA22 L2 VDDIO2

B3 NRSTB E3 PA9 H3 PA19 L3 VDDIO2

B4 TEST E4 PA11 H4 PA18 L4 PB4

B5 TDO E5 PA8 H5 GND L5 PB5

B6 PC27 E6 VDDIO1 H6 GND L6 PB11

B7 GND E7 VDDIO1 H7 GND L7 PB12

B8 NC E8 VDDIO1 H8 VDDCORE L8 PB17

B9 PC20/PGMD9 E9 PC5/PGMNOE H9 PC29 L9 PB19

B10 PC15/PGMD4 E10 PC0/PGMEN0 H10 VDDCORE L10 PB22

B11 PC13/PGMD2 E11 PC2/PGMEN2 H11 PC28 L11 PB23

B12 PC11/PGMD0 E12 VDDCORE H12 AD0 L12 AD3

C1 PA3 F1 VDDLCD J1 CAPP2 M1 VDDINLCD

C2 PA4 F2 PA13 J2 PA23 M2 PB0

C3 PA2 F3 PA14 J3 PA24 M3 PB1

C4 CLKIN F4 PA12 J4 PA21 M4 PB2

C5 FWUP F5 GND J5 PA20 M5 PB6

C6 TDI F6 GND J6 PB8 M6 PB7

C7 PC22/PGMD11 F7 GND J7 PB9 M7 VDDIO2

C8 PC19/PGMD8 F8 VDDIO1 J8 PB14 M8 PB16

C9 PC16/PGMD5 F9 TCK J9 VDDCORE M9 PB18

C10 PC9/PGMM2 F10 JTAGSEL J10 VDDCORE M10 PB21

C11 PC10/PGMM3 F11 PC1/PGMEN1 J11 VDDCORE M11 GND

C12 PC8/PGMM1 F12 VDDIO1 J12 AD1 M12 ADVREF

6257AS–ATARM–28-Feb-08

11

5. Power Considerations

5.1 Power Supplies

The AT91SAM7L128/64 has six types of power supply pins and integrates a voltage regulator,
allowing the device to be supplied with only one voltage. The six power supply pin types are:

• VDDOUT pin. It is the output of the voltage regulator. Output voltage can be programmed
from 1.55V to 1.80V by steps of 100 mV.

• VDDIO1 pin. It powers the voltage regulator input and all the PIOC IO lines (1.8V-3.6V).
VDDIO1 voltage must be above 2.2V to allow the chip to start-up (POR threshold).

• VDDIO2 pin. It powers the PIOA and PIOB I/O lines (1.8V-3.6V). It is also the output of the
LCD voltage regulator. The output voltage can be programmed from 2.4V to 3.4V with 16
steps.

• VDDCORE pin. It powers the logic of the device, the PLL, the 2 MHz Fast RC oscillator, the
ADC and the Flash memory. It must be connected to the VDDOUT pin with a decoupling
capacitor.

• VDDINLCD pin. It powers the charge pump which can be used as LCD Regulator power
supply. Voltage ranges from 1.8V to 3.6V.

No separate ground pins are provided for the different power supplies. Only GND pins are pro­vided and should be connected as shortly as possible to the system ground plane.

5.2 Low Power Modes

The various low power modes of the AT91SAM7L128/64 are described below.

5.2.1 Off (Power Down) Mode

In off (power down) mode, the entire chip is shut down. Only a low level on the FWUP pin can
wake up the AT91SAM7L128/64 (by a push-button for example). Internally, except for the
FWUP pin through VDDIO1, none of the chip is supplied.

Once the internal main power switch has been activated by FWUP, the 32 kHz RC oscillator and
the Supply Controller are supplied, then the core and peripherals are reset and the
AT91SAM7L128/64 enters in active mode. Refer to the System Controller Block Diagram, Fig-

ure 9-1 on page 30.

At first power-up, if FWUP is tied high, the device enters off mode. The PIOA and PIOB pins’
states are undefined. PIOC and NRST pins are initialized as high impedance inputs.

Once the device enters active mode, the core and the parallel input/output controller are reset.
Then, if the chip enters off mode, PIOA and PIOB pins are configured as inputs with pull-ups and
PIOC pins as high impedance inputs.

Current consumption in this mode is typically 100 nA.

5.2.2 Backup Mode

In backup mode, the supply controller, the zero-power power-on reset and the 32 kHz oscillator
(software selectable internal RC or external crystal) remain running. The voltage regulator and
the core are switched off.

Prior to entering this mode, the RTC, the backup SRAM, the brownout detector, the charge
pump, the LCD voltage regulator and the LCD controller can be set on or off separately.

12

AT91SAM7L128/64 Preliminary

6257AS–ATARM–28-Feb-08

5.2.3 Wait Mode

5.2.4 Idle Mode

5.2.5 Active Mode

AT91SAM7L128/64 Preliminary

Table 5-1 on page 13 shows an example of backup mode with backup SRAM and RTC running.

When entering this mode, all PIO pins keep their previous states, they are reinitialized as inputs
with pull-ups at wake-up.

The AT91SAM7L128/64 can be awakened from this mode through the FWUP pin, an event on
WUP0-15 pins, or an RTC alarm or brownout event.

Current consumption is 3.5 µA typical without the LCD controller running.

In wait mode, the voltage regulator must be set in deep mode. Voltage regulator output voltage
should be set at a minimum voltage to decrease leakage in the digital core. No clock is running
in the core. From this mode, a fast start-up is available (refer to Section 5.4 ”Fast Start-Up”).

In this mode, all PIO pins keep their previous states.

The processor is in idle mode which means that the processor has no clock but the Master clock
(MCK) remains running. The processor can also be wakened by an IRQ or FIQ.

The total dynamic power consumption is less than 30 mA at full speed (36 MHz) when running
out of the Flash. The power management controller can be used to adapt the frequency and the
regulator output voltage can be adjusted to optimize power consumption.

5.2.6 Low Power Mode Summary Table

The modes detailed above are the main modes. In off mode, no options are available but once
the shutdown controller is set to on, each part can be set to on, or off, separately and more
modes can be active. The table below shows a summary of the configurations of the low power
modes.

Table 5-1. Low Power Mode Configuration Summary

SUPC,

32 kHz

Oscillator,

Mode FWUP

Off Mode X FWUP pin 100 nA typ < 5 ms

Backup Mode
(with SRAM and
RTC)

Wait Mode (with
SRAM and RTC)

Idle Mode X X X X X

XXXX

XXXX XX

POR RTC

Notes: 1. When considering wake-up time, the time required to start the PLL is not taken into account. Once started, the

AT91SAM7128/L64 works with the 2 MHz Fast RC oscillator. The user has to add the PLL start-up time if it is needed in the
system. The wake-up time is defined as the time taken for wake up until the first instruction is fetched.

2. The external LCD current consumption and the external loads on PIOs are not taken into account in the calculation.

3. BOD current consumption is not included.

4. Depends on MCK frequency.

Backup

SRAM

Regulator

(Deep Mode) Core

Potential Wake-up

Sources Consumption

FWUP pin
WUP0-15 pins
BOD alarm
RTC alarm

Fast start-up through
WUP0-15 pins

IRQs
FIQ

(2)(3)

Wake-up Time

3.5 µA typ < 0.5 ms

9 µA typ

(4) (4)

< 2 µs (in case of
fast start-up)

(1)

6257AS–ATARM–28-Feb-08

13

5.3 Wake-up Sources

The wake-up events allow the device to exit from backup mode. When a wake-up event is
detected, the supply controller performs a sequence which automatically reenables the voltage
regulator and the backup SRAM power supply, if it is not already enabled.

Figure 5-1. Wake Up Sources

FWUP

WKUP0

WKUP1

WKUP15

brown_out

rtc_alarm

Falling

Edge

Detector

WKUPT0

Falling/Rising

Edge

Detector

WKUPT1

Falling/Rising

Edge

Detector

WKUPT15

Falling/Rising

Edge

Detector

BODEN

RTCEN

FWUPDBC

FWUPEN FWUP

WKUPEN0

WKUPEN1

WKUPEN15

WKUPIS0

WKUPIS1

WKUPIS15

SLCK

Debouncer

WKUPDBC

SLCK

Debouncer

Core
Supply
Restart

WKUPS

5.4 Fast Start-Up

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AT91SAM7L128/64 Preliminary

The SAM7L128/64 allows the processor to restart in a few microseconds while the processor is
in wait mode. A fast start up can occur upon detection of a low level on one of the 16 wake-up
inputs.

The fast restart circuitry, as shown in Figure 5-2, is fully asynchronous and provides a fast start­up signal to the power management controller. As soon as the fast start-up signal is asserted,
the PMC automatically restarts the embedded 2 MHz Fast RC oscillator, switches the master
clock on this 2 MHz clock and reenables the processor clock, if it is disabled.

6257AS–ATARM–28-Feb-08

Figure 5-2. Fast Start-Up Circuitry

FSTT0

WKUP0

FSTT1

AT91SAM7L128/64 Preliminary

5.5 Voltage Regulator

The AT91SAM7L128/64 embeds a voltage regulator that is managed by the supply controller.
This internal regulator is only intended to supply the internal core of AT91SAM7L128/64. It fea­tures three different operating modes:

• In normal mode, the voltage regulator consumes less than 30 µA static current and draws

• In deep mode, the current consumption of the voltage regulator is less than 8.5 µA. It can

• In shutdown mode, the voltage regulator consumes less than 1 µA while its output is driven

Furthermore, in normal and deep modes, the regulator output voltage can be programmed by
software with 4 different steps within the range of 1.55V to 1.80V. The default output voltage is

1.80V in both normal and deep modes. The voltage regulator can regulate 1.80V output voltage
as long as the input voltage is above 1.95V. Below 1.95V input voltage, the output voltage
remains above 1.65V.

WKUP1

FSTT15

WKUP15

fast_restart

60 mA of output current.

draw up to 1 mA of output current. The default output voltage is 1.80V and the start-up time to
reach normal mode is inferior to 400 µs.

internally to GND. The default output voltage is 1.80V and the start-up time to reach normal
mode is inferior to 400 µs.

6257AS–ATARM–28-Feb-08

Output voltage adjusting ability allows current consumption reduction on VDDCORE and also
enables programming a lower voltage when the input voltage is lower than 1.95V.

At 1.55V, the Flash is still functional but with slower read access time. Programming or erasing
the Flash is not possible under these conditions. MCK maximum frequency is 25 MHz with
VDDCORE at 1.55V (1.45V minimum).

The regulator has an indicator that can be used by the software to show that the output voltage
has the correct value (output voltage has reached at least 80% of the typical voltage). This flag
is used by the supply controller. This feature is only possible when the voltage regulator is in
normal mode at 1.80V.

Adequate output supply decoupling is mandatory for VDDOUT in order to reduce ripple and
avoid oscillations. One external 2.2 µF (or 3.3 µF) X7R capacitor must be connected between
VDDOUT and GND.

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