RETI
(SP); PChigh
(SP + 1); SP
SP + 2| 1 | 1 | 1 | 0 | 1 | 1 | 0 | 1 |
| 0 | 1 | 0 | 0 | 1 | 1 | 0 | 1 |
RETI
OBJECT CODE
RETI |
Return from interrupt. | |||||||||
| Function: | PClow
(SP); PChigh
(SP + 1); SP
SP + 2 |
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| Format: |
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byte 1: ED |
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byte 2: 4D |
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| Description: | The program counter is popped off the stack as described for the POP instructions. This instruction is recognized by Zilog peripheral devices as the end of a peripheral service routine so as to allow proper control of nested priority interrupts. An EI instruction must be executed prior to RETI in order to re-enable interrupts. |
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| Data Flow: | ||||||||||
| Timing: | 4 M cycles; 14 T states: 7 usec @ 2 MHz |
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| Addressing Mode: | indirect |
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| Flags: | |
(no effect) |
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| Example: | RETI |
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OBJECT CODE |
Before: |
After: |
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