MC68HC05X4 Datasheet, PDF (56/156 Pages) Motorola, Inc – HCMOS Microcontroller Unit

Freescale Semiconductor, Inc.
Resets, Interrupts and Low Power Modes
STOP
WAIT
Stop oscillator and
all clocks.
Clear I bit.
Oscillator active
Timer clocks active
Processor clocks
stopped
No
Reset
?
Yes
No
CIRQ/WOI
?
Yes
Turn on oscillator.
Wait for time delay
to stabilise
Reset
No
?
Yes
CIRQ
No
interrupt?
Yes
Core timer
No
interrupt?
Yes
WOI
No
interrupt?
Restart processor
clock
Yes
16-bit timer _No
interrupt?
Yes
MC68HC05X4
(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
Fetch
instruction
Fetch
instruction
Figure 3. STOP and WAIT flow charts
Resets, Interrupts and Low Power Modes
For More Information On This Product,
Go to: www.freescale.com
10-resets