MC68HC705J2 Datasheet, PDF (28/82 Pages) Freescale Semiconductor, Inc – member of the low-cost

Freescale Semiconductor, Inc.
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Figure 4-2 shows the sequence of events caused by the STOP instruction.
STOP
CLEAR TIMER INTERRUPT FLAGS AND
TIMER INTERRUPT ENABLE BITS.
CLEAR TIMER PRESCALER.
CLEAR CCR INTERRUPT MASK.
STOP OSCILLATOR.
NO
EXTERNAL
NO
INTERRUPT
?
YES
RESET
?
YES
TURN ON OSCILLATOR.
DELAY 4064 CYCLES
TO STABILIZE.
(1) FETCH RESET VECTOR or
(2) SERVICE INTERRUPT.
a. SAVE CPU REGISTERS ON STACK.
b. SET CCR INTERRUPT MASK.
c. VECTOR TO INTERRUPT
SERVICE ROUTINE.
Figure 4-2. STOP Instruction Flowchart
CENTRAL PROCESSOR UNIT
4-6
Rev. 2
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