LDA: Difference between revisions

Revision as of 20:43, 17 May 2023

LDA (Load Accumulator) is a 65x instruction that loads the accumulator.


Basic Info
Addressing Mode	Opcode	Length	Speed
immediate	A9	2 bytes	2 cycles
absolute	AD	3 bytes	4 cycles
absolute long	AF	4 bytes	5 cycles
direct page	A5	2 bytes	3 cycles
direct page indirect	B2	2 bytes	5 cycles
direct page indirect long	A7	2 bytes	6 cycles
absolute indexed by X	BD	3 bytes	4 cycles
absolute long indexed by X	BF	4 bytes	5 cycles
absolute indexed by Y	B9	3 bytes	4 cycles
direct page indexed by X	B5	2 bytes	4 cycles
direct page indexed indirect by X	A1	2 bytes	6 cycles
direct page indirect indexed by Y	B1	2 bytes	5 cycles
direct page indirect long indexed by Y	B7	2 bytes	6 cycles
stack relative	A3	2 bytes	4 cycles
stack relative indirect indexed by Y	B3	2 bytes	7 cycles


Flags Clobbered
N	V	M	X	D	I	Z	C
	.	.	.	.	.		.

@@ Line 113: / Line 113: @@
 * [[Carr]] page on LDA: https://archive.org/details/6502UsersManual/page/n276
 * [[Leventhal]] page on LDA: https://archive.org/details/6502-assembly-language-programming/page/n120
+* snes9x implementation of LDA: https://github.com/snes9xgit/snes9x/blob/master/cpuops.cpp#L678
 [[Category:ASM]]
 [[Category:Group One Instructions]]
 [[Category:Inherited from 6502]]