MC68HC05E0 Datasheet, PDF (42/96 Pages) Motorola, Inc – High-density complementary metal oxide semiconductor (HCMOS) microcontroller unit

4
STOP
Stop Oscillator
and all clocks
Clear I Bit
WAIT
Oscillator active
Processor clock stopped
All other clocks active
Clear I Bit
No
No _{INTX or}
Wake-up
?
Yes
RESET
?
Yes
Turn on oscillator
Wait for
stabilisation
time delay
Turn on oscillator
Wait for
stabilisation
time delay
Stack
PC/X/A/CC
Reset
Processor
Set
I-bit
Load PC
from
$1FFA,
$1FFB
Load PC
from
$1FFE,
$1FFF
RESET
?
Yes
Restart
Internal
Clocks
No
INTX, RTI No
or Wake-up
?
Yes
No
TIMER A
?
Yes
No
TIMER B
?
Yes
SI
No
?
Yes
Restart
Internal
Clocks
Restart
Internal
Clocks
Restart
Internal
Clocks
Restart
Internal
Clocks
Reset
Processor
Stack
PC/X/A/CC
Stack
Stack
PC/X/A/CC PC/X/A/CC
Stack
PC/X/A/CC
Set
Set
Set
Set
I-bit
I-bit
I-bit
I-bit
Load PC
from
$1FFE,
$1FFF
Load PC
from
$1FFA,
$1FFB
Load PC
from
$1FF8,
$1FF9
Load PC
from
$1FF6,
$1FF7
Load PC
from
$1FF4,
$1FF5
Fetch
Instruction
Fetch
Instruction
Figure 4-4 STOP/WAIT Flow Chart
MOTOROLA
4-6
RESETS, INTERRUPTS AND LOW POWER MODES
MC68HC05E0