MC68HC705C8A Datasheet, PDF (72/222 Pages) Motorola, Inc – HCMOS Microcontroller Unit

Low-Power Modes
STOP
CLEAR I BIT IN CCR
CLEAR COP COUNTER
TURN OFF INTERNAL OSCILLATOR
TURN OFF COP COUNTER
EXTERNAL
YES
RESET?
NO
NO _EXTERNAL
INTERRUPT?
YES
TURN ON INTERNAL OSCILLATOR
TURN ON COP WATCHDOG
END OF
YES
STABILIZATION
DELAY?
NO
TURN ON INTERNAL OSCILLATOR
TURN ON COP WATCHDOG
END OF
YES
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
72
Low-Power Modes
MC68HC705C8A — Rev. 2.0
MOTOROLA