MC68HC705P9 Datasheet, PDF (88/156 Pages) Motorola, Inc – HCMOS Microcontroller Unit

COP _{Low-Power Modes}
Low-Power Modes
The STOP and WAIT instructions put the MCU in low-power
consumption standby modes.
Stop Mode
The STOP instruction clears the COP watchdog counter. Upon exit from
stop mode by external reset:
• The counter begins counting from $0000.
• The counter is cleared again after the 4064-cycle oscillator
stabilization delay.
Upon exit from stop mode by external interrupt:
• The counter begins counting from $0000.
• The counter is not cleared again after the oscillator stabilization
delay and has a count of 4064 when the program resumes.
Wait Mode
The COP watchdog continues to operate normally after a WAIT
instruction. Software should periodically take the MCU out of wait mode
and write to the COPC bit to prevent a COP watchdog timeout.
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COP
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