MC68HC705J1ACPE Datasheet, PDF (86/162 Pages) Freescale Semiconductor, Inc – Freescale Semiconductor, Inc.

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
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 5-2. Stop/Halt/Wait Flowchart
Technical Data
MC68HC705J1A — Rev. 4.0
Low-Power Modes
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