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SBC: Difference between revisions
From SnesLab
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| Line 17: | Line 17: | ||
|4 cycles* | |4 cycles* | ||
|+ | |+ | ||
|[[Absolute Long Addressing|Absolute | |[[Absolute Long Addressing|Absolute Long]] | ||
|EF | |EF | ||
|4 bytes | |4 bytes | ||
| Line 27: | Line 27: | ||
|3 cycles* | |3 cycles* | ||
|+ | |+ | ||
| | |[[Direct Page Indirect Addressing|Direct Page Indirect]] | ||
|F2 | |F2 | ||
|2 bytes | |2 bytes | ||
|5 cycles* | |5 cycles* | ||
|+ | |+ | ||
| | |[[Direct Page Indirect Long]] | ||
|E7 | |E7 | ||
|2 bytes | |2 bytes | ||
| Line 72: | Line 72: | ||
|6 cycles* | |6 cycles* | ||
|+ | |+ | ||
| | |[[Stack Relative]] | ||
|E3 | |E3 | ||
|2 bytes | |2 bytes | ||
| Line 86: | Line 86: | ||
!colspan="9"|Flags Affected | !colspan="9"|Flags Affected | ||
|+ | |+ | ||
|N | |[[N Flag|N]] | ||
|V | |[[V Flag|V]] | ||
|M | |[[M Flag|M]] | ||
|X | |[[X Flag|X]] | ||
|D | |[[D Flag|D]] | ||
|I | |[[I Flag|I]] | ||
|Z | |[[Z Flag|Z]] | ||
|C | |[[C Flag|C]] | ||
|+ | |+ | ||
| | | | ||
| Line 112: | Line 112: | ||
=== External Links === | === External Links === | ||
* [[Eyes & Lichty]] page on SBC: https://archive.org/details/0893037893ProgrammingThe65816/page/n523 | * [[Eyes & Lichty]] page 497, on SBC: https://archive.org/details/0893037893ProgrammingThe65816/page/n523 | ||
* [[Labiak]] page on SBC: https://archive.org/details/Programming_the_65816/page/n189 | * [[Labiak]] page 179 on SBC: https://archive.org/details/Programming_the_65816/page/n189 | ||
* [[MCS6500 Manual]] page on SBC: https://archive.org/details/mos_microcomputers_programming_manual/page/n29 | * [[MCS6500 Manual]] page 14 on SBC: https://archive.org/details/mos_microcomputers_programming_manual/page/n29 | ||
* [[Carr]] page on SBC: https://archive.org/details/6502UsersManual/page/n284 | * [[Carr]] page 271 on SBC: https://archive.org/details/6502UsersManual/page/n284 | ||
* [[Leventhal]] page on SBC: https://archive.org/details/6502-assembly-language-programming/page/n140 | * [[Leventhal]] page 3-91 on SBC: https://archive.org/details/6502-assembly-language-programming/page/n140 | ||
* snes9x implementation of SBC: https://github.com/snes9xgit/snes9x/blob/master/cpuops.cpp#L1133 | * snes9x implementation of SBC: https://github.com/snes9xgit/snes9x/blob/master/cpuops.cpp#L1133 | ||
* undisbeliever on SBC: https://undisbeliever.net/snesdev/65816-opcodes.html#sbc-subtract-with-borrow-from-accumulator | * undisbeliever on SBC: https://undisbeliever.net/snesdev/65816-opcodes.html#sbc-subtract-with-borrow-from-accumulator | ||
Latest revision as of 04:08, 6 December 2023
| Basic Info | |||||||
|---|---|---|---|---|---|---|---|
| Addressing Mode | Opcode | Length | Speed | ||||
| Immediate | E9 | 2 bytes | 2 cycles* | ||||
| Absolute | ED | 3 bytes | 4 cycles* | ||||
| Absolute Long | EF | 4 bytes | 5 cycles* | ||||
| Direct Page | E5 | 2 bytes | 3 cycles* | ||||
| Direct Page Indirect | F2 | 2 bytes | 5 cycles* | ||||
| Direct Page Indirect Long | E7 | 2 bytes | 6 cycles* | ||||
| absolute indexed by X | FD | 3 bytes | 4 cycles* | ||||
| absolute long indexed by X | FF | 4 bytes | 5 cycles* | ||||
| absolute indexed by Y | F9 | 3 bytes | 4 cycles* | ||||
| direct page indexed by X | F5 | 2 bytes | 4 cycles* | ||||
| direct page indirect indexed by X | E1 | 2 bytes | 6 cycles* | ||||
| direct page indirect indexed by Y | F1 | 2 bytes | 5 cycles* | ||||
| direct page indirect long indexed by Y | F7 | 2 bytes | 6 cycles* | ||||
| Stack Relative | E3 | 2 bytes | 4 cycles* | ||||
| stack relative indirect indexed by Y | F3 | 2 bytes | 7 cycles* | ||||
| Flags Affected | ||||||||
|---|---|---|---|---|---|---|---|---|
| N | V | M | X | D | I | Z | C | |
| . | . | . | . | |||||
SBC (Subtract with Carry/Borrow) is 65x instruction that performs a subtraction.
See Also
External Links
- Eyes & Lichty page 497, on SBC: https://archive.org/details/0893037893ProgrammingThe65816/page/n523
- Labiak page 179 on SBC: https://archive.org/details/Programming_the_65816/page/n189
- MCS6500 Manual page 14 on SBC: https://archive.org/details/mos_microcomputers_programming_manual/page/n29
- Carr page 271 on SBC: https://archive.org/details/6502UsersManual/page/n284
- Leventhal page 3-91 on SBC: https://archive.org/details/6502-assembly-language-programming/page/n140
- snes9x implementation of SBC: https://github.com/snes9xgit/snes9x/blob/master/cpuops.cpp#L1133
- undisbeliever on SBC: https://undisbeliever.net/snesdev/65816-opcodes.html#sbc-subtract-with-borrow-from-accumulator