Datasheet

Low Power Modes
Serial Peripheral Interface Module (SPI)
MC68HC908GR8 — Rev 4.0 Technical Data
MOTOROLA Low Power Modes 55
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.
Frees
cale Semiconductor,
I
Freescale Semiconductor, Inc.
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