
Resets, Interrupts and Low Power Modes
MC68HC05X4
56
Resets, Interrupts and Low Power Modes
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MOTOROLA
Figure 3. STOP and WAIT flow charts
16-bit timer
interrupt
WOI
interrupt
Core timer
interrupt
Stop oscillator and
all clocks.
Clear I bit.
STOP
WAIT
Reset
CIRQ/WOI
Reset
(1) Fetch reset vector
or
(2) Service interrupt:
a. stack
b. set I-bit
c. vector to
interrupt
routine
(1) Fetch reset vector
or
(2) Service interrupt:
a. stack
b. set I-bit
c. vector to
interrupt
routine
Turn on oscillator.
Wait for time delay
to stabilise
Restart processor
clock
Yes
Yes
Yes
Yes
Yes
Yes
No
No
No
No
No
No
CIRQ
interrupt
Yes
No
Oscillator active
Timer clocks active
Processor clocks
stopped
Fetch
instruction
Fetch
instruction
10-resets
F
Freescale Semiconductor, Inc.
n
.