MC68HC705P9CDW FREESCALE [Freescale Semiconductor, Inc], MC68HC705P9CDW Datasheet - Page 72
MC68HC705P9CDW
Manufacturer Part Number
MC68HC705P9CDW
Description
Microcontrollers
Manufacturer
FREESCALE [Freescale Semiconductor, Inc]
Datasheet
1.MC68HC705P9CDW.pdf
(160 pages)
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Resets and Interrupts
5.4.4 Interrupt Processing
Technical Data
72
The CPU takes the following actions to begin servicing an interrupt:
The return from interrupt (RTI) instruction causes the CPU to recover the
CPU registers from the stack as shown in
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Freescale Semiconductor, Inc.
STACKING
ORDER
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Stores the CPU registers on the stack in the order shown in
Figure 5-6
Sets the I bit in the condition code register to prevent further
interrupts
Loads the program counter with the contents of the appropriate
interrupt vector locations:
– $1FFC and $1FFD (software interrupt vector)
– $1FFA and $1FFB (external interrupt vector)
– $1FF8 and $1FF9 (timer interrupt vector)
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UNSTACKING
ORDER
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Resets and Interrupts
Figure 5-6. Interrupt Stacking Order
PROGRAM COUNTER (HIGH BYTE)
PROGRAM COUNTER (LOW BYTE)
CONDITION CODE REGISTER
INDEX REGISTER
ACCUMULATOR
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Figure
MC68HC705P9 — Rev. 4.0
5-6.
$00C0 (BOTTOM OF STACK)
$00C1
$00C2
$00FD
$00FE
$00FF (TOP OF STACK)
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