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EOR
From SnesLab
Basic Info | |||||||
---|---|---|---|---|---|---|---|
Addressing Mode | Opcode | Length | Speed | ||||
immediate | 49 | 2 bytes | 2 cycles* | ||||
absolute | 4D | 3 bytes | 4 cycles* | ||||
absolute long | 4F | 4 bytes | 5 cycles* | ||||
direct page | 45 | 2 bytes | 3 cycles* | ||||
direct page indirect | 52 | 2 bytes | 5 cycles* | ||||
direct page indirect long | 47 | 2 bytes | 6 cycles* | ||||
absolute indexed by X | 5D | 3 bytes | 4 cycles* | ||||
absolute long indexed by X | 5F | 4 bytes | 5 cycles* | ||||
absolute indexed by Y | 59 | 3 bytes | 4 cycles* | ||||
direct page indexed by X | 55 | 2 bytes | 4 cycles* | ||||
direct page indexed indirect by X | 41 | 2 bytes | 6 cycles* | ||||
direct page indirect indexed by Y | 51 | 2 bytes | 5 cycles* | ||||
direct page indirect long indexed by Y | 57 | 2 bytes | 6 cycles* | ||||
stack relative | 43 | 2 bytes | 4 cycles* | ||||
stack relative indirect indexed by Y | 53 | 2 bytes | 7 cycles* |
Flags Affected | |||||||
---|---|---|---|---|---|---|---|
N | V | M | X | D | I | Z | C |
. | . | . | . | . | . |
EOR is a 65x instruction that performs an exclusive or. In all addressing modes, EOR takes one extra cycle when the accumulator is 16 bits wide. In direct page addressing modes, EOR takes one additional cycle if the low byte of the direct page register is nonzero.
See Also
External Links
- Eyes & Lichty page on EOR: https://archive.org/details/0893037893ProgrammingThe65816/page/n480
- Labiak page on EOR: https://archive.org/details/Programming_the_65816/page/n151
- MCS6500 Manual page on EOR: https://archive.org/details/mos_microcomputers_programming_manual/page/n36
- Carr page on EOR: https://archive.org/details/6502UsersManual/page/n272
- Leventhal page on EOR: https://archive.org/details/6502-assembly-language-programming/page/n112
- snes9x implementation of EOR: https://github.com/snes9xgit/snes9x/blob/master/cpuops.cpp#L533
- undisbeliever on EOR: https://undisbeliever.net/snesdev/65816-opcodes.html#eor-exclusive-or-accumulator-with-memory