MC68HC08AZ32A Datasheet, PDF (80/312 Pages) Motorola, Inc – HCMOS Microcontroller Unit

Computer Operating Properly (COP) Module
5.7 Low-Power Modes
The WAIT and STOP instructions put the MCU in low power-consumption standby modes.
5.7.1 Wait Mode
The COP remains active during wait mode. If COP is enabled, a reset will occur at COP timeout.
5.7.2 Stop Mode
Stop mode turns off the CGMXCLK input to the COP and clears the SIM counter. 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 MORA register ($001F) (see Chapter 10 Mask Options) enables the STOP
instruction. To prevent inadvertently turning off the COP with a STOP instruction, disable the STOP
instruction by programming the STOP bit to 0.
5.8 COP Module During Break Interrupts
The COP is disabled during a break interrupt when V_TST (see 20.5 5.0 Volt DC Electrical Characteristics)
is present on the RST pin.
MC68HC08AZ32A Data Sheet, Rev. 2
80
Freescale Semiconductor