AT91SAM7L64 datasheet(13/564 Pages) ATMEL

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6257A–ATARM–20-Feb-08

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.

5.2.3

Wait Mode

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.

5.2.4

Idle Mode

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.

5.2.5

Active Mode

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.

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.

Table 5-1.

Low Power Mode Configuration Summary

Mode

FWUP

SUPC,

32 kHz

Oscillator,

POR

RTC

Backup

SRAM

Regulator

(Deep Mode)

Core

Potential Wake-up

Sources

Consumption

(2)(3)

Wake-up Time

(1)

Off Mode

FWUP pin

100 nA typ

< 5 ms

Backup Mode

(with SRAM and

RTC)

FWUP pin

WUP0-15 pins

BOD alarm

RTC alarm

3.5 µA typ

< 0.5 ms

Wait Mode (with

SRAM and RTC)

Fast start-up through

WUP0-15 pins

9 µA typ

< 2 µs (in case of

fast start-up)

Idle Mode

IRQs

FIQ

(4)

AT91SAM7L64 Datasheet(PDF) 13 Page - ATMEL Corporation

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