M68ICS08GR datasheet(55/408 Pages) FREESCALE

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Low Power Modes

Serial Peripheral Interface Module (SPI)

MC68HC908GR8 — Rev 4.0

Technical Data

MOTOROLA

Low Power Modes

3.11.2 Stop Mode

The SCI module is inactive in stop mode. The STOP instruction does not

affect SCI register states. SCI module operation resumes after the MCU

exits stop mode.

Because the internal clock is inactive during stop mode, entering stop

mode during an SCI transmission or reception results in invalid data.

3.12 Serial Peripheral Interface Module (SPI)

3.12.1 Wait Mode

The SPI module remains active in wait mode. Any enabled CPU interrupt

request from the SPI module can bring the MCU out of wait mode.

If SPI module functions are not required during wait mode, reduce power

consumption by disabling the SPI module before executing the WAIT

instruction.

3.12.2 Stop Mode

The SPI module is inactive in stop mode. The STOP instruction does not

affect SPI register states. SPI operation resumes after an external

interrupt. If stop mode is exited by reset, any transfer in progress is

aborted, and the SPI is reset.

3.13 Timer Interface Module (TIM1 and TIM2)

3.13.1 Wait Mode

The TIM remains active in wait mode. Any enabled CPU interrupt

request from the TIM can bring the MCU out of wait mode.

If TIM functions are not required during wait mode, reduce power

consumption by stopping the TIM before executing the WAIT instruction.

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