MC68HC705C4ACB MOTOROLA [Motorola, Inc], MC68HC705C4ACB Datasheet - Page 61
MC68HC705C4ACB
Manufacturer Part Number
MC68HC705C4ACB
Description
Microcontrollers
Manufacturer
MOTOROLA [Motorola, Inc]
Datasheet
1.MC68HC705C4ACB.pdf
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MC68HC705C4A • MC68HSC705C4A — Rev. 3.0
MOTOROLA
NOTE:
The return-from-interrupt (RTI) instruction causes the CPU to recover
the CPU registers from the stack as shown in
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.
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
Figure
for a priority listing.
$00C0 (BOTTOM OF STACK)
$00C1
$00C2
$00FD
$00FE
$00FF (TOP OF STACK)
4-4.
Interrupt Processing
•
•
•
•
•
•
Technical Data
Interrupts
61
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