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MC68HC705P9CS датащи(PDF) 72 Page - Freescale Semiconductor, Inc

номер детали MC68HC705P9CS
подробное описание детали  Microcontrollers
PDF  160 Pages
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производитель  FREESCALE [Freescale Semiconductor, Inc]
домашняя страница  http://www.freescale.com
Logo FREESCALE - Freescale Semiconductor, Inc

MC68HC705P9CS датащи(HTML) 72 Page - Freescale Semiconductor, Inc

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Resets and Interrupts
Technical Data
MC68HC705P9 — Rev. 4.0
72
Resets and Interrupts
MOTOROLA
5.4.4 Interrupt Processing
The CPU takes the following actions to begin servicing an interrupt:
•
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)
The return from interrupt (RTI) instruction causes the CPU to recover the
CPU registers from the stack as shown in Figure 5-6.
Figure 5-6. Interrupt Stacking Order
CONDITION CODE REGISTER
$00C0 (BOTTOM OF STACK)
$00C1
$00C2
•
•
•
ACCUMULATOR
INDEX REGISTER
PROGRAM COUNTER (HIGH BYTE)
PROGRAM COUNTER (LOW BYTE)
•
•
•
•
•
•
•
•
•
$00FD
$00FE
$00FF (TOP OF STACK)
1
2
3
4
5
5
4
3
2
1
UNSTACKING
ORDER
STACKING
ORDER
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com



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