MC68HC705K1 Datasheet, PDF (60/140 Pages) Freescale Semiconductor, Inc – HCMOS Microcontroller Unit

Low-Power Modes
Freescale Semiconductor, Inc.
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
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
END OF
YES
STABILIZATION
DELAY?
NO
YES
EXTERNAL
RESET?
NO
YES
EXTERNAL
INTERRUPT?
NO
YES
TIMER
INTERRUPT?
NO
YES
COP
RESET?
NO
YES
EXTERNAL
RESET?
NO
YES
EXTERNAL
INTERRUPT?
NO
YES
TIMER
INTERRUPT?
NO
YES
COP
RESET?
NO
Technical Data
TURN ON CPU CLOCK
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 6-1. Stop/Wait/Halt Flowchart
Low-Power Modes
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MC68HC705K1 — Rev. 2.0