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SBC: Difference between revisions
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'''SBC''' (Subtract with Carry/Borrow) is 65x instruction that performs a subtraction. | '''SBC''' (Subtract with Carry/Borrow) is 65x instruction that performs a subtraction. | ||
The difference is stored in the accumulator. | |||
=== See Also === | === See Also === |
Revision as of 22:36, 28 June 2024
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 Indexed Indirect 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.
The difference is stored in the accumulator.
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