68HC805K3 Datasheet, PDF (55/119 Pages) Freescale Semiconductor, Inc – General Release Specification

Freescale Semiconductor, Inc.
General Release Specification
Low-Power Modes
STOP
MASK
OPTION TO
Y=1
HALT?
N=0
STOP EXTERNAL OSCILLATOR,
STOP INTERNAL TIMER CLOCK, AND
RESET STARTUP DELAY
STOP INTERNAL PROCESSOR
CLOCK, CLEAR I BIT IN CCR, AND
SET IRQE IN ISCR
WAIT
HALT
EXTERNAL OSCILLATOR ACTIVE
AND INTERNAL TIMER CLOCK
ACTIVE
STOP INTERNAL PROCESSOR
CLOCK, CLEAR I BIT IN CCR,
AND SET IRQE IN ISCR
EXTERNAL OSCILLATOR ACTIVE
AND INTERNAL TIMER CLOCK
ACTIVE
STOP INTERNAL PROCESSOR
CLOCK, CLEAR I BIT IN CCR,
AND SET IIRQE IN ISCR
EXTERNAL
RESET?
N
IRQ
EXTERNAL
INTERRUPT?
N
Y
Y
EXTERNAL
RESET?
N
IRQ
Y
Y
EXTERNAL
INTERRUPT?
RESTART EXTERNAL OSCILLATOR
N
AND BEGIN STABILIZATION DELAY
TIMER
Y
INTERNAL
INTERRUPT?
END
OF STARTUP
Y
N
DELAY
N
RESTART INTERNAL
PROCESSOR CLOCK
1.FETCH RESET VECTOR OR
2.SERVICE INTERRUPT
a.STACK CPU STATE
b.SET I BIT
C. VECTOR TO INTERRUPT ROUTINE
Y
EXTERNAL
RESET?
N
IRQ
Y
EXTERNAL
INTERRUPT?
N
TIMER
Y
INTERNAL
INTERRUPT?
N
Figure 6-1. Stop/Halt/Wait Flowcharts
MC68HC805K3 — Rev. 1.0
Operational Modes
55
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