Freescale Semiconductor, Inc.
Low-Power Modes
STOP
CLEAR I BIT IN CCR
CLEAR COP COUNTER
TURN OFF INTERNAL OSCILLATOR
TURN OFF COP COUNTER
YES
EXTERNAL
RESET?
NO
NO
EXTERNAL
INTERRUPT?
TURN ON INTERNAL OSCILLATOR
TURN ON COP WATCHDOG
YES
TURN ON INTERNAL OSCILLATOR
TURN ON COP WATCHDOG
END OF
STABILIZATION
DELAY?
YES
NO
YES
END OF
STABILIZATION
DELAY?
NO
CLEAR COP COUNTER
TURN ON INTERNAL CLOCK
TURN ON INTERNAL CLOCK
1. LOAD PC WITH RESET VECTOR
OR
2. SERVICE INTERRUPT:
a. SAVE CPU REGISTERS ON STACK
b. SET I BIT IN CCR
c. LOAD PC WITH INTERRUPT VECTOR
1. LOAD PC WITH RESET VECTOR
OR
2. SERVICE INTERRUPT:
a. SAVE CPU REGISTERS ON STACK
b. SET I BIT IN CCR
c. LOAD PC WITH INTERRUPT VECTOR
Figure 6-3. Non-Programmable COP Watchdog
in Stop Mode (NCOPE = 1) Flowchart
Technical Data
74
MC68HC705C8A — Rev. 3
Low-Power Modes
For More Information On This Product,
Go to: www.freescale.com
FREESCALE [ Freescale ]
