MC68HC05P9A Datasheet, PDF (62/158 Pages) Freescale Semiconductor, Inc – HCMOS Microcontroller Unit

Freescale Semiconductor, Inc.
Low-Power Modes
STOP
HALT
MOR
SWAIT
Y
BIT SET?
N
STOP EXTERNAL OSCILLATOR,
STOP INTERNAL TIMER CLOCK,
RESET STARTUP DELAY
EXTERNAL OSCILLATOR ACTIVE
AND
INTERNAL TIMER CLOCK ACTIVE
STOP INTERNAL
PROCESSOR CLOCK,
CLEAR I BIT IN CCR
STOP INTERNAL
PROCESSOR CLOCK,
CLEAR I BIT IN CCR
Y
EXTERNAL
RESET?
N
EXTERNAL
Y
RESET?
IRQ
Y
EXTERNAL
INTERRUPT?
N
N
IRQ
EXTERNAL ^Y
INTERRUPT?
TIMER
Y
INTERNAL
INTERRUPT?
N
RESTART EXTERNAL OSCILLATOR,
N
START STABILIZATION DELAY
COP
Y
INTERNAL
RESET?
END
OF STABILIZATION ^Y
N
DELAY?
N
RESTART
INTERNAL PROCESSOR CLOCK
1. FETCH RESET VECTOR
OR
2. SERVICE INTERRUPT
A. STACK
B. SET I BIT
C. VECTOR TO INTERRUPT ROUTINE
Figure 25. STOP/HALT Flowcharts
8-mc68hc05p9a
62
Low-Power Modes
MOTOROLA
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