M68ICS08GR datasheet(333/408 Pages) FREESCALE

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Timebase Module (TBM)

Low-Power Modes

MC68HC908GR8 — Rev 4.0

Technical Data

MOTOROLA

Timebase Module (TBM)

333

21.7 Low-Power Modes

The WAIT and STOP instructions put the MCU in low power-

consumption standby modes.

21.7.1 Wait Mode

The timebase module remains active after execution of the WAIT

instruction. In wait mode, the timebase register is not accessible by the

CPU.

If the timebase functions are not required during wait mode, reduce the

power consumption by stopping the timebase before enabling the WAIT

instruction.

21.7.2 Stop Mode

The timebase module may remain active after execution of the STOP

instruction if the oscillator has been enabled to operate during stop mode

through the OSCSTOPEN bit in the CONFIG register. The timebase

module can be used in this mode to generate a periodic wakeup from

stop mode.

If the oscillator has not been enabled to operate in stop mode, the

timebase module will not be active during STOP mode. In stop mode, the

timebase register is not accessible by the CPU.

If the timebase functions are not required during stop mode, reduce the

power consumption by stopping the timebase before enabling the STOP

instruction.

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M68ICS08GR 데이터시트(PDF) 333 Page - Freescale Semiconductor, Inc