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EI (SPC700): Difference between revisions
From SnesLab
(No other flags are affected.) |
(→See Also: SPC/BRK) |
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'''EI''' (Enable Interrupts) is an [[SPC700]] instruction that sets the [[interrupt enable flag]]. | '''EI''' (Enable Interrupts) is an [[SPC700]] instruction that sets the [[interrupt enable flag]]. | ||
As the [[S-SMP]] has no hardware interrupt sources, EI is not very useful. | As the [[S-SMP]] has no hardware interrupt sources, EI is not very useful. | ||
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EI | EI | ||
</pre> | </pre> | ||
The official manual has a typo where the [[zero flag]] is set instead. | |||
=== See Also === | === See Also === | ||
* [[DI]] | * [[DI]] | ||
* [[RETI]] | * [[RETI]] | ||
* [[BRK (SPC700)]] | |||
* [[CLI]] | * [[CLI]] | ||
* [[SEI]] | * [[SEI]] | ||
Latest revision as of 00:18, 14 August 2024
| Basic Info | |||||||
|---|---|---|---|---|---|---|---|
| Addressing Mode | Opcode | Length | Speed | ||||
| Implied (type 2) | A0 | 1 byte | 3 cycles | ||||
| Flags Affected | |||||||
|---|---|---|---|---|---|---|---|
| N | V | P | B | H | I | Z | C |
| . | . | . | . | . | 1 | . | . |
EI (Enable Interrupts) is an SPC700 instruction that sets the interrupt enable flag.
As the S-SMP has no hardware interrupt sources, EI is not very useful.
No other flags are affected.
Syntax
EI
The official manual has a typo where the zero flag is set instead.
See Also
External Links
- Official Super Nintendo development manual on EI: Table C-19 in Appendix C-10 of Book I
- anomie: https://github.com/yupferris/TasmShiz/blob/master/spc700.txt#L428