MC68HC908GT16 Datasheet, PDF (64/412 Pages) Motorola, Inc – Microcontrollers

Low-Power Modes
3.7 Computer Operating Properly Module (COP)
3.7.1 Wait Mode
The computer operating properly (COP) module remains active in wait
mode. To prevent a COP reset during wait mode, periodically clear the
COP counter in a CPU interrupt routine.
3.7.2 Stop Mode
Stop mode turns off the COPCLK 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 CONFIG1 register 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 external interrupt (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.
Technical Data
64
MC68HC908GT16 • MC68HC908GT8 — Rev. 2
Low-Power Modes
MOTOROLA