MC68HC05X4 Datasheet, PDF (55/156 Pages) Motorola, Inc – HCMOS Microcontroller Unit

9-resets
Freescale Semiconductor, Inc.
Resets, Interrupts and Low Power Modes
Low power modes
Reset
Yes
Is I-bit set?
No
CIRQ
Yes
interrupt?
No
Yes
Core timer?
No
WOI
Yes
interrupt?
No
Yes
16-bit timer?
No
Clear relevant IRQ
request latch
Stack
PC, X, A, CC
Set I-bit
Load PC from:
SWI: $1FFC-$1FFD
CIRQ: $1FFA-$1FFB
Core timer:$1FF8-$1FF9
WOI: $1FF6-$1FF7
16-bit timer:$1FF4-$1FF5
Fetch next
instruction
SWI
Yes
instructi_No_on?
No
RTI
Yes
instruction?
No
Execute
instruction
Restore registers
from stack:
CC, A, X, PC
Figure 2. Reset flow chart
Resets, Interrupts and Low Power Modes
For More Information On This Product,
Go to: www.freescale.com
MC68HC05X4 Rev 1.0