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EI (SPC700): Difference between revisions
From SnesLab
(EI abbreviation expansion) |
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!colspan="8"|Basic Info | !colspan="8"|Basic Info | ||
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|'''Speed''' | |'''Speed''' | ||
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| | |[[Implied]] (type 2) | ||
|A0 | |A0 | ||
|1 byte | |1 byte | ||
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{| class="wikitable" style="float:right;clear:right;width:30%" | {| class="wikitable" style="float:right;clear:right;width:30%" | ||
!colspan="8"|Flags | !colspan="8"|Flags Affected | ||
|+ | |+ | ||
|N | |[[Negative Flag|N]] | ||
|V | |[[Overflow Flag|V]] | ||
|P | |[[Direct Page Flag|P]] | ||
|B | |[[Break Flag|B]] | ||
|H | |[[Half-Carry Flag|H]] | ||
|I | |[[Interrupt Enable Flag|I]] | ||
|Z | |[[Zero Flag|Z]] | ||
|C | |[[Carry Flag|C]] | ||
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|. | |. | ||
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'''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 ==== | |||
<pre> | |||
EI | |||
</pre> | |||
The official manual has a typo where the [[zero flag]] is set instead. | |||
=== See Also === | === See Also === | ||
* [[DI]] | * [[DI]] | ||
* [[RETI]] | |||
* [[BRK (SPC700)]] | |||
* [[CLI]] | |||
* [[SEI]] | |||
=== External Links === | === External Links === | ||
* Official Nintendo | * Official Super Nintendo development manual on EI: Table C-19 in [https://archive.org/details/SNESDevManual/book1/page/n235 Appendix C-10 of Book I] | ||
* anomie: https://github.com/yupferris/TasmShiz/blob/master/spc700.txt#L428 | |||
[[Category:ASM]] | [[Category:ASM]] | ||
[[Category:SPC700]] | [[Category:SPC700]] | ||
[[Category:Program Status Flag Operation Commands]] | [[Category:Program Status Flag Operation Commands]] | ||
[[Category:One-byte Instructions]] | |||
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