MC68HC05P9A Datasheet, PDF (64/158 Pages) Freescale Semiconductor, Inc – HCMOS Microcontroller Unit

Freescale Semiconductor, Inc.
Low-Power Modes
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 26. WAIT Instruction Flowchart
OSC1
OSC2
WAIT
STOP
INTERNAL
OSCILLATOR
÷ 2 ^{INTERNAL CLOCK}
÷2
CPU CLOCK
TIMER CLOCK
ADC CLOCK
Figure 27. STOP/WAIT Clock Logic
10-mc68hc05p9a
64
Low-Power Modes
MOTOROLA
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