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SEC: Difference between revisions
From SnesLab
(type 2 admode) |
(linkify implied) |
||
| Line 7: | Line 7: | ||
|'''Speed''' | |'''Speed''' | ||
|+ | |+ | ||
| | |[[Implied]] (type 2) | ||
|38 | |38 | ||
|1 byte | |1 byte | ||
| Line 14: | Line 14: | ||
{| class="wikitable" style="float:right;clear:right;width:30%" | {| class="wikitable" style="float:right;clear:right;width:30%" | ||
!colspan="9"|Flags | !colspan="9"|Flags Affected | ||
|+ | |+ | ||
|N | |N | ||
Revision as of 21:02, 23 July 2023
| 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.
See Also
External Links
- Eyes & Lichty page on SEC: https://archive.org/details/0893037893ProgrammingThe65816/page/n525
- Labiak page on SEC: https://archive.org/details/Programming_the_65816/page/n190
- MCS6500 Manual page on SEC: https://archive.org/details/mos_microcomputers_programming_manual/page/n39
- Carr page on SEC: https://archive.org/details/6502UsersManual/page/n285
- Leventhal page on SEC: https://archive.org/details/6502-assembly-language-programming/page/n142
- snes9x implementation of SEC: https://github.com/snes9xgit/snes9x/blob/master/cpuops.cpp#L1427