MC68HC705P9 Datasheet, PDF (98/160 Pages) Motorola, Inc – HCMOS Microcontroller Unit

Freescale Semiconductor, Inc.
Computer Operating Properly Watchdog (COP)
8.7 Low-Power Modes
The STOP and WAIT instructions put the MCU in low-power
consumption standby modes.
8.7.1 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.
8.7.2 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.
Technical Data
98
Computer Operating Properly Watchdog (COP)
For More Information On This Product,
Go to: www.freescale.com
MC68HC705P9 — Rev. 4.0
MOTOROLA