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STX
From SnesLab
| Basic Info | |||||||
|---|---|---|---|---|---|---|---|
| Addressing Mode | Opcode | Length | Speed | ||||
| Absolute | 8E | 3 bytes | 4 cycles* | ||||
| Direct Page | 86 | 2 bytes | 3 cycles* | ||||
| direct page indexed Y | 96 | 2 bytes | 4 cycles* | ||||
| Flags Affected | ||||||||
|---|---|---|---|---|---|---|---|---|
| N | V | M | X | D | I | Z | C | |
| . | . | . | . | . | . | . | . | |
STX (Store X) is a 65x instruction that stores the value of the X index register. STX takes one additional cycle when the index registers are 16 bits wide, in all addressing modes. In both direct page addressing modes only, STX takes another additional cycle if the low byte of the direct page register is nonzero.
See Also
External Links
- Eyes & Lichty page 505, on STX: https://archive.org/details/0893037893ProgrammingThe65816/page/n531
- Labiak page on STX: https://archive.org/details/Programming_the_65816/page/n195
- MCS6500 Manual page on STX: https://archive.org/details/mos_microcomputers_programming_manual/page/n115
- Carr page on STX: https://archive.org/details/6502UsersManual/page/n287
- Leventhal page on STX: https://archive.org/details/6502-assembly-language-programming/page/n146
- snes9x implementation of STX: https://github.com/snes9xgit/snes9x/blob/master/cpuops.cpp#L1287
- undisbeliever on STX: https://undisbeliever.net/snesdev/65816-opcodes.html#stx-store-index-register-x-to-memory