MC68HC705J2 Datasheet, PDF (30/82 Pages) Freescale Semiconductor, Inc – member of the low-cost

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4-8
Freescale Semiconductor, Inc.
WAIT
OSCILLATOR ACTIVE.
TIMER CLOCKS ACTIVE.
STOP CPU CLOCKS.
CLEAR CCR INTERRUPT MASK.
RESET
?
YES
NO
EXTERNAL
INTERRUPT
?
YES
YES
NO
INTERNAL
TIMER
INTERRUPT
?
NO
RESTART
CPU CLOCK.
(1) FETCH RESET VECTOR or
(2) SERVICE INTERRUPT.
a. SAVE CPU REGS ON STACK.
b. SET I-BIT IN CCR.
c. VECTOR TO INTERRUPT
SERVICE ROUTINE.
Figure 4-3. WAIT Instruction Flowchart
CENTRAL PROCESSOR UNIT
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Rev. 2