M68ICS08GR datasheet(53/408 Pages) FREESCALE

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Low Power Modes

External Interrupt Module (IRQ)

MC68HC908GR8 — Rev 4.0

Technical Data

MOTOROLA

Low Power Modes

3.7.2 Stop Mode

Stop mode turns off the CGMXCLK input to the COP and clears the COP

prescaler. Service the COP immediately before entering or after exiting

stop mode to ensure a full COP timeout period after entering or exiting

stop mode.

The STOP bit in the configuration register (CONFIG) enables the STOP

instruction. To prevent inadvertently turning off the COP with a STOP

instruction, disable the STOP instruction by clearing the STOP bit.

3.8 External Interrupt Module (IRQ)

3.8.1 Wait Mode

The IRQ module remains active in wait mode. Clearing the IMASK1 bit

in the IRQ status and control register enables IRQ CPU interrupt

requests to bring the MCU out of wait mode.

3.8.2 Stop Mode

The IRQ module remains active in stop mode. Clearing the IMASK1 bit

in the IRQ status and control register enables IRQ CPU interrupt

requests to bring the MCU out of stop mode.

3.9 Keyboard Interrupt Module (KBI)

3.9.1 Wait Mode

The keyboard module remains active in wait mode. Clearing the

IMASKK bit in the keyboard status and control register enables keyboard

interrupt requests to bring the MCU out of wait mode.

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