SEC

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.

No other flags are affected.

Syntax

SEC

See Also

• CLC
• XCE
• SED
• SEI
• SEP

External Links

• Eyes & Lichty, page 499 on SEC
• Labiak, page 180 on SEC
• 3.0.1 on MCS6500 Manual, page 24 on SEC
• 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