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SEC: Difference between revisions
From SnesLab
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* [[MCS6500 Manual]] page 24 on SEC: https://archive.org/details/mos_microcomputers_programming_manual/page/n39 | * [[MCS6500 Manual]] page 24 on SEC: https://archive.org/details/mos_microcomputers_programming_manual/page/n39 | ||
* [[Carr]], [https://archive.org/details/6502UsersManual/page/n285 page 272] on SEC | * [[Carr]], [https://archive.org/details/6502UsersManual/page/n285 page 272] on SEC | ||
* [[Leventhal]] | * [[Leventhal]], [https://archive.org/details/6502-assembly-language-programming/page/n142 page 3-93] on SEC | ||
* snes9x implementation of SEC: https://github.com/snes9xgit/snes9x/blob/master/cpuops.cpp#L1427 | * snes9x implementation of SEC: https://github.com/snes9xgit/snes9x/blob/master/cpuops.cpp#L1427 | ||
* Clark, Bruce. http://www.6502.org/tutorials/65c816opcodes.html#6.4.1 | * Clark, Bruce. http://www.6502.org/tutorials/65c816opcodes.html#6.4.1 | ||
Revision as of 17:30, 8 August 2024
| Basic Info | |||||||
|---|---|---|---|---|---|---|---|
| Addressing Mode | Opcode | Length | Speed | ||||
| Implied (type 2) | 38 | 1 byte | 2 cycles | ||||
| Flags Affected | ||||||||
|---|---|---|---|---|---|---|---|---|
| N | V | M | X | D | I | Z | C | |
| . | . | . | . | . | . | . | 1 | |
SEC is a 65x instruction that sets the carry flag.
Similar to doing a CLC before an ADC, it is recommended to run SEC (or otherwise make sure the carry flag is set) before running a SBC so that the difference is correct.
Syntax
SEC
See Also
External Links
- Eyes & Lichty, page 499 on SEC
- Labiak, page 180 on SEC
- MCS6500 Manual page 24 on SEC: https://archive.org/details/mos_microcomputers_programming_manual/page/n39
- Carr, page 272 on SEC
- Leventhal, page 3-93 on SEC
- snes9x implementation of SEC: https://github.com/snes9xgit/snes9x/blob/master/cpuops.cpp#L1427
- Clark, Bruce. http://www.6502.org/tutorials/65c816opcodes.html#6.4.1