MC705P6ACPE Datasheet, PDF (29/98 Pages) Freescale Semiconductor, Inc – M68HC05 Microcontrollers

Low-Power Modes
STOP
HALT
WAIT
MOR
SWAIT
Y
BIT SET?
N
STOP EXTERNAL OSCILLATOR,
STOP INTERNAL TIMER CLOCK,
RESET STARTUP DELAY
EXTERNAL OSCILLATOR ACTIVE
AND
INTERNAL TIMER CLOCK ACTIVE
STOP INTERNAL
PROCESSOR CLOCK,
CLEAR I BIT IN CCR
STOP INTERNAL
PROCESSOR CLOCK,
CLEAR I BIT IN CCR
Y
EXTERNAL
RESET?
N
EXTERNAL
Y
RESET?
IRQ
Y
EXTERNAL
INTERRUPT?
N
N
IRQ
EXTERNAL
Y
INTERRUPT?
TIMER
Y
INTERNAL
INTERRUPT?
N
RESTART EXTERNAL OSCILLATOR,
N
START STABILIZATION DELAY
COP
Y
INTERNAL
RESET?
END
OF STABILIZATION ^Y
N
DELAY?
N
RESTART
INTERNAL PROCESSOR CLOCK
EXTERNAL OSCILLATOR ACTIVE
AND
INTERNAL TIMER CLOCK ACTIVE
STOP INTERNAL
PROCESSOR CLOCK,
CLEAR I BIT IN CCR
Y
EXTERNAL
RESET?
N
IRQ
Y
EXTERNAL
INTERRUPT?
N
TIMER
Y
INTERNAL
INTERRUPT?
N
COP
Y
INTERNAL
RESET?
N
1. FETCH RESET VECTOR
OR
2. SERVICE INTERRUPT
A. STACK
B. SET I BIT
C. VECTOR TO INTERRUPT ROUTINE
Figure 3-2. STOP/WAIT Flowcharts
MC68HC705P6A Advance Information Data Sheet, Rev. 2.1
Freescale Semiconductor
29