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SEI: Difference between revisions
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!colspan="9"|Flags Affected | !colspan="9"|Flags Affected | ||
|+ | |+ | ||
|N | |[[Negative Flag|N]] | ||
|V | |[[Overflow Flag|V]] | ||
|M | |[[M Flag|M]] | ||
|X | |[[X Flag|X]] | ||
|D | |[[Decimal Flag|D]] | ||
|I | |[[I Flag|I]] | ||
|Z | |[[Zero Flag|Z]] | ||
|C | |[[Carry Flag|C]] | ||
|+ | |+ | ||
|. | |. | ||
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'''SEI''' (SEt Interrupt) is a [[65c816]] instruction that disables maskable interrupts. | '''SEI''' (SEt Interrupt) is a [[65c816]] instruction that disables maskable interrupts by setting the [[interrupt disable flag]]. | ||
SEI is recommened by some tutorials to be one of the first instructions run after the SNES comes out of reset so a game can boot properly without interruption. | |||
No other flags are affected. | |||
==== Syntax ==== | |||
<pre> | |||
SEI | |||
</pre> | |||
=== See Also === | === See Also === | ||
* [[CLI]] | * [[CLI]] | ||
* [[SEP]] | |||
* [[EI]] | |||
* [[DI]] | |||
* [[IRQ]] | |||
* [[RTI]] | |||
=== External Links === | === External Links === | ||
* [[Eyes & Lichty]] | * [[Eyes & Lichty]], [https://archive.org/details/0893037893ProgrammingThe65816/page/501 page 501] on SEI | ||
* [[Labiak]] | * [[Labiak]], [https://archive.org/details/Programming_the_65816/page/n192 page 182] on SEI | ||
* [[MCS6500 Manual]] | * 3.2.1 on [[MCS6500 Manual]], [https://archive.org/details/mos_microcomputers_programming_manual/page/n41 page 26] on SEI | ||
* [[Carr]] | * [[Carr]], [https://archive.org/details/6502UsersManual/page/n286 page 273] on SEI | ||
* [[Leventhal]] | * [[Leventhal]], [https://archive.org/details/6502-assembly-language-programming/page/n144 page 3-95] on SEI | ||
* snes9x implementation of SEI: https://github.com/snes9xgit/snes9x/blob/master/cpuops.cpp#L1434 | * snes9x implementation of SEI: https://github.com/snes9xgit/snes9x/blob/master/cpuops.cpp#L1434 | ||
[[Category:ASM]] | [[Category:ASM]] | ||
[[Category:Inherited from 6502]] | [[Category:Inherited from 6502]] | ||
[[Category:One-byte Instructions]] | |||
[[Category:Implied Instructions]] | |||
[[Category:Two-cycle Instructions]] | |||
Latest revision as of 23:12, 8 August 2024
| Basic Info | |||||||
|---|---|---|---|---|---|---|---|
| Addressing Mode | Opcode | Length | Speed | ||||
| Implied (type 2) | 78 | 1 byte | 2 cycles | ||||
| Flags Affected | ||||||||
|---|---|---|---|---|---|---|---|---|
| N | V | M | X | D | I | Z | C | |
| . | . | . | . | . | 1 | . | . | |
SEI (SEt Interrupt) is a 65c816 instruction that disables maskable interrupts by setting the interrupt disable flag.
SEI is recommened by some tutorials to be one of the first instructions run after the SNES comes out of reset so a game can boot properly without interruption.
No other flags are affected.
Syntax
SEI
See Also
External Links
- Eyes & Lichty, page 501 on SEI
- Labiak, page 182 on SEI
- 3.2.1 on MCS6500 Manual, page 26 on SEI
- Carr, page 273 on SEI
- Leventhal, page 3-95 on SEI
- snes9x implementation of SEI: https://github.com/snes9xgit/snes9x/blob/master/cpuops.cpp#L1434