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SEP: Difference between revisions
From SnesLab
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| | | | ||
|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]] | ||
|+ | |+ | ||
| [[emulation mode]] | | [[emulation mode]] | ||
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|} | |} | ||
'''SEP''' is a [[65c816]] instruction that sets bits in the [[status register]] that correspond to set bits in the operand. | '''SEP''' (Set Status Bits) is a [[65c816]] instruction that sets bits in the [[status register]] that correspond to set bits in the operand. | ||
SEP appears to be the only way to set the m and x flags other than [[PLP]] and [[RTI]]. | |||
=== See Also === | === See Also === | ||
* [[REP]] | * [[REP]] | ||
* [[SEC]] | |||
* [[SED]] | |||
* [[SEI]] | |||
=== External Links === | === External Links === | ||
* [[Eyes & Lichty]] page on SEP: https://archive.org/details/0893037893ProgrammingThe65816/page/n528 | * [[Eyes & Lichty]] page 502, on SEP: https://archive.org/details/0893037893ProgrammingThe65816/page/n528 | ||
* [[Labiak]] page on SEP: https://archive.org/details/Programming_the_65816/page/n193 | * [[Labiak]] page 183 on SEP: https://archive.org/details/Programming_the_65816/page/n193 | ||
* snes9x implementation of SEP: https://github.com/snes9xgit/snes9x/blob/master/cpuops.cpp#L3203 | * snes9x implementation of SEP: https://github.com/snes9xgit/snes9x/blob/master/cpuops.cpp#L3203 | ||
* undisbeliever on SEP: https://undisbeliever.net/snesdev/65816-opcodes.html#sep-set-status-bits | * undisbeliever on SEP: https://undisbeliever.net/snesdev/65816-opcodes.html#sep-set-status-bits | ||
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[[Category:ASM]] | [[Category:ASM]] | ||
[[Category:65c816 additions]] | [[Category:65c816 additions]] | ||
[[Category:Two-byte Instructions]] | |||
[[Category:Three-cycle Instructions]] | |||
[[Category:Single Admode Mnemonics]] | |||
Latest revision as of 16:51, 14 December 2023
| Basic Info | |||||||
|---|---|---|---|---|---|---|---|
| Addressing Mode | Opcode | Length | Speed | ||||
| Immediate | E2 | 2 bytes | 3 cycles | ||||
| Flags Affected | ||||||||
|---|---|---|---|---|---|---|---|---|
| N | V | M | X | D | I | Z | C | |
| emulation mode | . | . | ||||||
| native mode | ||||||||
SEP (Set Status Bits) is a 65c816 instruction that sets bits in the status register that correspond to set bits in the operand.
SEP appears to be the only way to set the m and x flags other than PLP and RTI.
See Also
External Links
- Eyes & Lichty page 502, on SEP: https://archive.org/details/0893037893ProgrammingThe65816/page/n528
- Labiak page 183 on SEP: https://archive.org/details/Programming_the_65816/page/n193
- snes9x implementation of SEP: https://github.com/snes9xgit/snes9x/blob/master/cpuops.cpp#L3203
- undisbeliever on SEP: https://undisbeliever.net/snesdev/65816-opcodes.html#sep-set-status-bits