MC68HC05P9A Datasheet, PDF (82/158 Pages) Freescale Semiconductor, Inc – HCMOS Microcontroller Unit

COP
Freescale Semiconductor, Inc.
Low-Power Modes
The STOP, HALT, 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 COP counter begins counting from $0000.
• The COP counter is cleared again after the 4064-cycle oscillator
stabilization delay.
Upon exit from stop mode by external interrupt:
• The COP counter begins counting from $0000.
• The COP counter is not cleared again after the oscillator
stabilization delay and has a count of 4064 when the program
resumes.
Halt Mode
NOTE:
Halt mode is NOT designed for intentional use. Halt mode is only
provided to keep the COP watchdog timer active in the event a STOP
instruction is executed inadvertently. This mode of operation is usually
achieved by invoking wait mode.
Execution of the STOP instruction when STOP is disabled mask option
is selected placing the MCU in this low-power mode. Halt mode
consumes the same amount of power as wait mode (both halt and wait
modes consume more power than stop mode).
Upon exit from halt mode by COP reset or external reset:
• The COP counter begins counting from $0000
• the COP counter resumes counting after a delay of one to 4064
cycles
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COP
MOTOROLA
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