MC68HC705P6A Datasheet, PDF (38/130 Pages) Motorola, Inc – HCMOS Microcontroller Unit

Operating Modes
STOP
HALT
WAIT
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
INTERRUPT?
N
TIMER
Y
Y
INTERNAL
INTERRUPT?
RESTART EXTERNAL OSCILLATOR,
START STABILIZATION DELAY
Y
N
COP
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
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 3-2. STOP/WAIT Flowcharts
Advance Information
38
Operating Modes
MC68HC705P6A — Rev. 2.0
MOTOROLA