We've just updated MediaWiki and its underlying software. If anything doesn't look or work quite right, please mention it to us. --RanAS
CLC: Difference between revisions
From SnesLab
(snes9x implementation) |
(moved tables up) |
||
| Line 1: | Line 1: | ||
{| class="wikitable" style="float:right;clear:right;width:30%" | {| class="wikitable" style="float:right;clear:right;width:30%" | ||
!colspan="8"|Basic Info | !colspan="8"|Basic Info | ||
| Line 38: | Line 34: | ||
|0 | |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 === | === See Also === | ||
Revision as of 18:29, 15 July 2023
| Basic Info | |||||||
|---|---|---|---|---|---|---|---|
| Addressing Mode | Opcode | Length | Speed | ||||
| implied | 18 | 1 byte | 2 cycles | ||||
| Flags Clobbered | ||||||||
|---|---|---|---|---|---|---|---|---|
| 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 on CLC: https://archive.org/details/0893037893ProgrammingThe65816/page/n467
- Labiak page 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