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MC68HC908GR4MP Datasheet(PDF) 47 Page - Freescale Semiconductor, Inc

Part # MC68HC908GR4MP
Description  M68HC08 Microcontrollers
PDF  286 Pages
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Manufacturer  FREESCALE [Freescale Semiconductor, Inc]
Direct Link  http://www.freescale.com
Logo FREESCALE - Freescale Semiconductor, Inc

MC68HC908GR4MP Datasheet(HTML) 47 Page - Freescale Semiconductor, Inc

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Interrupts
MC68HC908GR8 • MC68HC908GR4 Data Sheet, Rev. 7
Freescale Semiconductor
47
4.3.1 Effects
An interrupt:
•
Saves the CPU registers on the stack. At the end of the interrupt, the RTI instruction recovers the
CPU registers from the stack so that normal processing can resume.
•
Sets the interrupt mask (I bit) to prevent additional interrupts. Once an interrupt is latched, no other
interrupt can take precedence, regardless of its priority.
•
Loads the program counter with a user-defined vector address
Figure 4-3. Interrupt Stacking Order
CONDITION CODE REGISTER
ACCUMULATOR
INDEX REGISTER (LOW BYTE)*
PROGRAM COUNTER (HIGH BYTE)
PROGRAM COUNTER (LOW BYTE)
•
•
•
•
•
•
1
2
3
4
5
5
4
3
2
1
STACKING
ORDER
*High byte of index register is not stacked.
$00FF DEFAULT ADDRESS ON RESET
UNSTACKING
ORDER



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