MC68HC705 MOTOROLA [Motorola, Inc], MC68HC705 Datasheet - Page 56

• Manufacturer Part Number: MC68HC705
• Description: HCMOS Microcontroller Unit
• Manufacturer: MOTOROLA [Motorola, Inc]

Interrupts
Technical Data
56
NOTE:
If more than one interrupt request is pending, the CPU fetches the vector
of the higher priority interrupt first. A higher priority interrupt does not
interrupt a lower priority interrupt service routine unless the lower priority
interrupt service routine clears the I bit. See
listing.
Figure 4-5
STACKING
ORDER
5
4
3
2
1
UNSTACKING
ORDER
1
2
3
4
5
shows the sequence of events caused by an interrupt.
Figure 4-4. Interrupt Stacking Order
Interrupts
PROGRAM COUNTER (HIGH BYTE)
PROGRAM COUNTER (LOW BYTE)
CONDITION CODE REGISTER
INDEX REGISTER
ACCUMULATOR
•
•
•
•
•
•
Table 4-1
MC68HC705C8A — Rev. 2.0
$00C0 (BOTTOM OF STACK)
$00C1
$00C2
$00FD
$00FE
$00FF (TOP OF STACK)
•
•
•
•
•
•
for a priority
MOTOROLA