Datasheet

Low Power Modes
External Interrupt Module (IRQ)
MC68HC908GR8 — Rev 4.0 Technical Data
MOTOROLA Low Power Modes 53
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.
Frees
cale Semiconductor,
I
Freescale Semiconductor, Inc.
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