MC68HC705KJ1 Datasheet, PDF (61/108 Pages) Motorola, Inc – HCMOS Microcontroller Unit

STOP
SWAIT
YES
BIT SET?
NO
CLEAR I BIT IN CCR.
SET IRQE BIT IN ISCR.
CLEAR TOF, RTIF, TOIE, AND RTIE BITS IN TSCR.
TURN OFF INTERNAL OSCILLATOR.
Timing
HALT
WAIT
CLEAR I BIT IN CCR.
SET IRQE BIT IN ISCR.
TURN OFF CPU CLOCK.
TIMER CLOCK ACTIVE.
CLEAR I BIT IN CCR.
SET IRQE BIT IN ISCR.
TURN OFF CPU CLOCK.
TIMER CLOCK ACTIVE.
EXTERNAL ^YES
RESET?
NO
EXTERNAL ^YES
INTERRUPT?
NO
TURN ON INTERNAL OSCILLATOR.
RESET STABILIZATION TIMER.
YES _EXTERNAL
RESET?
NO
YES _EXTERNAL
INTERRUPT?
NO
YES
TIMER
INTERRUPT?
NO
END OF
YES
STABILIZATION
DELAY?
NO
YES
COP
RESET?
NO
TURN ON CPU CLOCK.
YES EXTERNAL
RESET?
NO
YES _EXTERNAL
INTERRUPT?
NO
YES
TIMER
INTERRUPT?
NO
YES
COP
RESET?
NO
1. LOAD PC WITH RESET VECTOR
OR
2. SERVICE INTERRUPT.
a. SAVE CPU REGISTERS ON STACK.
b. SET I BIT IN CCR.
c. LOAD PC WITH INTERRUPT VECTOR.
Figure 6-2. STOP/HALT/WAIT Flowchart
MC68HC705KJ1 • MC68HRC705KJ1 • MC68HLC705KJ1 Data Sheet, Rev. 4.1
Freescale Semiconductor
61