user manual

Low-Power Modes
General Release Specification MC68HC05RC16 — Rev. 3.0
56 Low-Power Modes MOTOROLA
Figure 6-2. Stop/Wait Flowchart
TURN ON OSCILLATOR.
WAIT FOR TIME
DELAY TO STABILIZE.
1. FETCH RESET
VECTOR OR
2. SERVICE
INTERRUPT
A. STACK
B. SET I BIT
C. VECTOR TO
INTERRUPT
ROUTINE
RESTART
PROCESSOR CLOCK.
1. FETCH RESET
VECTOR OR
2. SERVICE
INTERRUPT
A. STACK
B. SET I BIT
C. VECTOR TO
INTERRUPT
ROUTINE
Y
Y
Y
Y
Y
N
N
N
N
N
STOP
WAIT
RESET
OSCILLATOR ACTIVE.
CORE TIMER CLOCK ACTIVE.
PROCESSOR CLOCKS
STOPPED.
STOP OSCILLATOR
AND ALL CLOCKS.
CLEAR I BIT.
IR TIMER
INTERNAL
INTERRUPT
CORE TIMER
INTERNAL
INTERRUPT
N
Y
Y
IR TIMER CLOCK ACTIVE.
EXTERNAL
INTERRUPT
(
IRQ)
(PTB KEYSCAN PULLUPS)
EXTERNAL
(IRQ)
(PTB KEYSCAN PULLUPS)
INTERRUPT
OR
LPRST
RESET
OR
LPRST