Freescale Semiconductor, Inc.
GENERAL RELEASE SPECIFICATION
STOP
HALT
WAIT
8
2
EXTERNAL OSCILLATOR ACTIVE
AND
INTERNAL TIMER CLOCK ACTIVE
STOP
TO HALT
OPTION?
Y
N
3
STOP RC OSCILLATOR
EXTERNAL OSCILLATOR ACTIVE
AND
INTERNAL TIMER CLOCK ACTIVE
STOP EXTERNAL OSCILLATOR,
STOP INTERNAL TIMER CLOCK,
RESET START-UP DELAY
STOP INTERNAL PROCESSOR
CLOCK, CLEAR I BIT IN CCR
4
STOP INTERNAL PROCESSOR
CLOCK,
STOP RC OSCILLATOR
LVR OR
Y
5
EXTERNAL
STOP INTERNAL PROCESSOR
CLOCK, CLEAR I-BIT IN CCR
CLEAR I BIT IN CCR
RESET?
6
N
LVR OR
Y
IRQ
LVR OR
Y
EXTERNAL
RESET?
Y
Y
Y
EXTERNAL
INTERRUPT?
7
EXTERNAL
RESET?
N
N
N
8
IRQ
EXTERNAL
IRQ
EXTERNAL
Y
TIMER
INTERNAL
INTERRUPT?
Y
INTERRUPT?
INTERRUPT?
9
N
N
RESTART EXTERNAL OSCILLATOR,
START STABILIZATION DELAY
N
10
11
12
13
14
A
TIMER
INTERNAL
Y
COP
INTERNAL
RESET?
INTERRUPT?
N
END
Y
N
OF STABILIZATION
COP
INTERNAL
Y
DELAY?
RESET?
N
RESTART INTERNAL
PROCESSOR CLOCK
N
1. FETCH RESET VECTOR
OR
2. SERVICE INTERRUPT
A. STACK
B. SET I BIT
C. VECTOR TO INTERRUPT ROUTINE
16
17
18
19
20
Figure 6-2. STOP/WAIT Flowcharts
OPERATING MODES
MC68HC805P18
6-6
For More Information On This Product,
Go to: www.freescale.com
FREESCALE [ Freescale ]
