MC68HC05P18A Datasheet, PDF (51/130 Pages) Freescale Semiconductor, Inc – HCMOS Microcontroller Unit

Freescale Semiconductor, Inc.
Operating Modes
Low-Power Modes
STOP
HALT
WAIT
STOP
TO HALT MASK ^Y
OPTION?
N
STOP EXTERNAL OSCILLATOR
STOP INTERNAL TIMER CLOCK
RESET STARTUP 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 EXTERNAL
Y
RESET?
N
IRQ
Y
EXTERNAL
INTERRUPT?
N
IRQ
EXTERNAL
INTERRUPT?
N
Y
RESTART EXTERNAL
OSCILLATOR
START STABILIZATION DELAY
TIMER
Y
INTERNAL
INTERRUPT?
N
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 6-1. Stop, Halt, and Wait Modes Flowchart
MC68HC05P18A
Operating Modes
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Technical Data