MC68HC705P9 Datasheet, PDF (69/156 Pages) Motorola, Inc – HCMOS Microcontroller Unit

Low-Power Modes
Wait Mode
Figure 3 shows the sequence of events caused by the WAIT instruction.
WAIT
CLEAR I BIT IN CCR
STOP CPU CLOCK
NO
RESET?
YES
EXTERNAL
INTERRUPT?
NO
YES
TIMER
INTERRUPT?
NO
YES
OTHER ON-CHIP
INTERRUPT
SOURCES?
NO
RESTART CPU CLOCK
(1) FETCH RESET VECTOR
OR
(2) SERVICE INTERRUPT
a. SAVE CPU REGISTERS ON STACK
b. SET I BIT IN CCR
c. VECTOR TO INTERRUPT SERVICE ROUTINE
Figure 3. WAIT Instruction Flowchart
5-mc68hc705p9
MOTOROLA
Low-Power Modes
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