MC68HC908GR4MP datasheet(40/286 Pages) FREESCALE

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Low-Power Modes

MC68HC908GR8 • MC68HC908GR4 Data Sheet, Rev. 7

Freescale Semiconductor

3.9.2 Stop Mode

If enabled, the LVI module remains active in stop mode. If enabled to generate resets, the LVI module

can generate a reset and bring the MCU out of stop mode.

3.10 Serial Communications Interface Module (SCI)

3.10.1 Wait Mode

The SCI module remains active in wait mode. Any enabled CPU interrupt request from the SCI module

can bring the MCU out of wait mode.

If SCI module functions are not required during wait mode, reduce power consumption by disabling the

module before executing the WAIT instruction.

3.10.2 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.

3.11 Serial Peripheral Interface Module (SPI)

3.11.1 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.

3.11.2 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.

3.12 Timer Interface Module (TIM1 and TIM2)

3.12.1 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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