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CLC: Difference between revisions
From SnesLab
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Revision as of 06:27, 28 November 2023
| Basic Info | |||||||
|---|---|---|---|---|---|---|---|
| Addressing Mode | Opcode | Length | Speed | ||||
| Implied (type 2) | 18 | 1 byte | 2 cycles | ||||
| Flags Affected | ||||||||
|---|---|---|---|---|---|---|---|---|
| N | V | M | X | D | I | Z | C | |
| . | . | . | . | . | . | . | 0 | |
CLC is a 65x instruction that clears the carry flag.
The 6502 lacks an add-without-carry instruction, so it is important to make sure the carry flag is clear before doing an ADC or else the sum will be one too great.
See Also
External Links
- Eyes & Lichty page 441, on CLC: https://archive.org/details/0893037893ProgrammingThe65816/page/n467
- Labiak page 130 on CLC: https://archive.org/details/Programming_the_65816/page/n140
- MCS6500 Manual page on CLC: https://archive.org/details/mos_microcomputers_programming_manual/page/n40
- Carr page on CLC: https://archive.org/details/6502UsersManual/page/n266
- Leventhal page on CLC: https://archive.org/details/6502-assembly-language-programming/page/n101
- snes9x implementation of CLC: https://github.com/snes9xgit/snes9x/blob/master/cpuops.cpp#L1420