MC68HC08AZ0 Datasheet, PDF (166/444 Pages) Motorola, Inc – Advance Information

Freescale Semiconductor, Inc.
Computer Operating Properly Module (COP)
Low-power modes
The WAIT and STOP instructions put the MCU in
low-power-consumption standby modes.
WAIT mode
The COP continues to operate during WAIT mode. To prevent a COP
reset during WAIT mode, the COP counter should be cleared
periodically in a CPU interrupt routine or a DMA service routine.
STOP mode
STOP mode turns off the CGMXCLK input to the COP and clears the
COP prescaler. The COP should be serviced 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 mask option register (MOR) enables the STOP
instruction. To prevent inadvertently turning off the COP with a STOP
instruction, the STOP instruction should be disabled by programming the
STOP bit to ‘0’.
COP module during break interrupts
The COP is disabled during a break interrupt when V_HI is present on the
RST pin.
MC68HC08AZ0
164
Computer Operating Properly Module (COP)
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