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SEP: Difference between revisions
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==== Syntax ==== | ==== Syntax ==== | ||
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SEP #nvmxdizc | SEP #%nvmxdizc | ||
</pre> | </pre> | ||
Revision as of 13:22, 6 August 2024
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 | N | V | . | . | D | I | Z | C |
native mode | N | V | M | X | D | I | Z | C |
SEP (Set Status Bits) is a 65c816 instruction that sets bits in the status register that correspond to set bits in the operand.
SEP is the only way to set the m and x flags directly (but PLP and RTI may set them too.)[1] But, SEP can't modify those two flags in emulation mode because they are being forced to be set.
Syntax
SEP #%nvmxdizc
See Also
References
- Eyes & Lichty, page 502 on SEP
- Labiak, page 183 on SEP
- 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