Rainbow-electronics ATAR862-8 User Manual download pdf (Page 29)

ATAR862-8

4589B–4BMCU–02/03

System Configuration

Primary register address: "3"hex

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 kept when none of the interrupt pending or active register

bits are set. The application of the $AUTOSLEEP routine ensures the correct 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 to insert 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 estimation of the expected average system current consumption, the

following formula should be used:

total

syscl

) = I

Sleep

+ (I

´ t

active

total

)

depends on V

and f

syscl

Bit 3Bit 2Bit 1Bit 0

SC: write BOT – OS1 OS0 Reset value: 1x11b

BOT Brown-Out Threshold

BOT = 1, low brown-out voltage threshold (1.7 V)

BOT = 0, high brown-out voltage threshold (2.0 V)

OS1 Oscillator Select 1

OS0 Oscillator Select 0

Mode OS1 OS0 Input for SUBCL Selected Oscillators

111 C

in/

16 RC-oscillator 1 and external input clock

201 C

/16 RC-oscillator 1 and RC-oscillator 2

310 C

/16

RC-oscillator 1 and 4-MHz crystal

oscillator

400 32 kHz

RC-oscillator 1 and 32-kHz crystal

oscillator

Note: If bit CCS = 0 in the CM-register, the RC-oscillator 1 always stops.

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Rainbow-electronics ATAR862-8 User Manual Page 29

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