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INC: Difference between revisions
From SnesLab
(clobbered -> affected) |
(additional cycles) |
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| Line 15: | Line 15: | ||
|EE | |EE | ||
|3 bytes | |3 bytes | ||
|6 cycles | |6 cycles* | ||
|+ | |+ | ||
|[[Direct Page Addressing | Direct Page]] | |[[Direct Page Addressing | Direct Page]] | ||
|E6 | |E6 | ||
|2 bytes | |2 bytes | ||
|5 cycles | |5 cycles* | ||
|+ | |+ | ||
|absolute indexed X | |absolute indexed X | ||
|FE | |FE | ||
|3 bytes | |3 bytes | ||
|7 cycles | |7 cycles* | ||
|+ | |+ | ||
|direct page indexed X | |direct page indexed X | ||
|F6 | |F6 | ||
|2 bytes | |2 bytes | ||
|6 cycles | |6 cycles* | ||
|} | |} | ||
| Line 55: | Line 55: | ||
|} | |} | ||
'''INC''' (Increment) is a 65x instruction that increments the value in the location specified by the operand. | '''INC''' (Increment) is a 65x instruction that increments the value in the location specified by the operand. Except in [[accumulator addressing]], INC takes two extra cycles when the accumulator is 16 bits wide. | ||
=== See Also === | === See Also === | ||
Revision as of 00:13, 20 November 2023
| Basic Info | |||||||
|---|---|---|---|---|---|---|---|
| Addressing Mode | Opcode | Length | Speed | ||||
| Accumulator | 1A | 1 byte | 2 cycles | ||||
| Absolute | EE | 3 bytes | 6 cycles* | ||||
| Direct Page | E6 | 2 bytes | 5 cycles* | ||||
| absolute indexed X | FE | 3 bytes | 7 cycles* | ||||
| direct page indexed X | F6 | 2 bytes | 6 cycles* | ||||
| Flags Affected | ||||||||
|---|---|---|---|---|---|---|---|---|
| N | V | M | X | D | I | Z | C | |
| . | . | . | . | . | . | |||
INC (Increment) is a 65x instruction that increments the value in the location specified by the operand. Except in accumulator addressing, INC takes two extra cycles when the accumulator is 16 bits wide.
See Also
External Links
- Eyes & Lichty page on INC: https://archive.org/details/0893037893ProgrammingThe65816/page/n482
- Labiak page on INC: https://archive.org/details/Programming_the_65816/page/n152
- MCS6500 Manual page on INC: https://archive.org/details/mos_microcomputers_programming_manual/page/n176
- Carr page on INC: https://archive.org/details/6502UsersManual/page/n273
- Leventhal page on INC: https://archive.org/details/6502-assembly-language-programming/page/n114
- snes9x implementation of INC: https://github.com/snes9xgit/snes9x/blob/master/cpuops.cpp#L627
- undisbeliever on INC: https://undisbeliever.net/snesdev/65816-opcodes.html#inc-increment