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RETI (SPC700): Difference between revisions
From SnesLab
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'''RETI''' (RETurn from Interrupt) is an [[SPC700]] instruction that returns from an interrupt. All [[program status word]] flags are restored after being popped off the [[stack]]. The [[program counter]] is also popped from the stack. | '''RETI''' (RETurn from Interrupt) is an [[SPC700]] instruction that returns from an interrupt. All [[program status word]] flags are restored after being popped off the [[stack]]. The [[program counter]] is also popped from the stack. | ||
As the S-SMP has no hardware interrupt sources, this generally means returning from a [[BRK (SPC700)|BRK]]. | |||
==== Syntax ==== | ==== Syntax ==== | ||
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* [[DI]] | * [[DI]] | ||
* [[RET]] | * [[RET]] | ||
* [[RTI]] | * [[RTI]] | ||
* [[RTS]] | * [[RTS]] | ||
Revision as of 11:33, 23 July 2024
| Basic Info | |||||||
|---|---|---|---|---|---|---|---|
| Addressing Mode | Opcode | Length | Speed | ||||
| Stack | 7F | 1 byte | 6 cycles | ||||
| Flags Affected | |||||||
|---|---|---|---|---|---|---|---|
| N | V | P | B | H | I | Z | C |
RETI (RETurn from Interrupt) is an SPC700 instruction that returns from an interrupt. All program status word flags are restored after being popped off the stack. The program counter is also popped from the stack.
As the S-SMP has no hardware interrupt sources, this generally means returning from a BRK.
Syntax
RETI
See Also
References
- Table C-16 in Appendix C-9 of Book I of the official Super Nintendo development manual
- anomie: https://github.com/yupferris/TasmShiz/blob/master/spc700.txt#L547