ATAR080 datasheet(19/68 Pages) ATMEL

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ATAR080

4675D–4BMCU–12/04

Power-down Modes

The sleep mode is a shut-down condition which is used to reduce the average system

power consumption in applications where the microcontroller is not fully utilized. In this

mode, the system clock is stopped. The sleep mode is entered via the SLEEP instruc-

tion. This instruction sets the interrupt enable bit (I) in the condition code register to

enable all interrupts and stops the core. During the sleep mode the peripheral modules

remain active and are able to generate interrupts. The microcontroller exits the sleep

mode by carrying out any interrupt or a reset.

The sleep mode can only be maintained while none of the interrupt pending or active

function of the sleep mode. For standard applications use the $AUTOSLEEP routine to

enter the power-down mode. Using the SLEEP instruction instead of the $AUTOSLEEP

following an I/O instruction requires the insertion of 3 non-I/O instruction cycles (for

example NOP NOP NOP) between the IN or OUT command and the SLEEP command.

The total power consumption is directly proportional to the active time of the microcon-

troller. For a rough estimate of the expected average system current consumption, the

following formula should be used:

DD depends on VDD and fsyscl.

The ATAR080 has various power-down modes. During the sleep mode the clock for the

MARC4 core is stopped. With the NSTOP-bit in the clock management register (CM), it

is programmable if the clock for the on-chip peripherals is active or stopped during the

sleep mode. If the clock for the core and the peripherals is stopped the selected oscilla-

tor is switched off. An exception is the 32-kHz oscillator, if it is selected it runs

continuously independent of the NSTOP-bit. If the oscillator is stopped or the 32-kHz

oscillator is selected, power consumption is extremely low.

Table 8. Power-down Modes

Note:

1. Osc-Stop = SLEEP and NSTOP and WDL

total VDD,fsyscl

()

Sleep

active

total

--------------

⎝⎠

⎛⎞

Mode

CPU Core

Osc-Stop

(1)

Brown-out

Function

RC-oscillator 1

RC-oscillator 2

4-MHz Oscillator

32-kHz Oscillator

External Input

Clock

Active

RUN

Active

RUN

YES

Power-down

SLEEP

Active

RUN

YES

SLEEP

YES

STOP

RUN

STOP

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