MC68HC05P18 Datasheet, PDF (58/144 Pages) Freescale Semiconductor, Inc – Advance Information

Operating Modes
Freescale Semiconductor, Inc.
STOP
HALT
WAIT
STOP
Y
TO HALT
OPTION?
N
STOP EXTERNAL OSCILLATOR,
STOP INTERNAL TIMER CLOCK,
RESET START-UP DELAY
EXTERNAL OSCILLATOR ACTIVE
AND
INTERNAL TIMER CLOCK ACTIVE
STOP RC OSCILLATOR
STOP INTERNAL PROCESSOR
CLOCK, CLEAR I BIT IN CCR
STOP RC OSCILLATOR
STOP INTERNAL PROCESSOR
CLOCK, CLEAR I-BIT IN CCR
Y
LVR OR
EXTERNAL
RESET?
N
LVR OR
Y
EXTERNAL
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
EXTERNAL OSCILLATOR ACTIVE
AND
INTERNAL TIMER CLOCK ACTIVE
STOP INTERNAL PROCESSOR
CLOCK,
CLEAR I BIT IN CCR
Y
LVR OR
EXTERNAL
RESET?
N
IRQ
Y
EXTERNAL
INTERRUPT?
N
TIMER
Y
INTERNAL
INTERRUPT?
N
COP
Y
INTERNAL
RESET?
N
1. FETCH RESET VECTOR
OR
2. SERVICE INTERRUPT
A. STACK
B. SET I BIT
C. VECTOR TO INTERRUPT ROUTINE
Figure 6-2. STOP/WAIT Flowcharts
Advance Information
58
MC68HC(8)05P18 — Rev. 2.0
Operating Modes
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