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LDA: Difference between revisions

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* [[MCS6500 Manual]] page on LDA: https://archive.org/details/mos_microcomputers_programming_manual/page/n19
* [[MCS6500 Manual]] page on LDA: https://archive.org/details/mos_microcomputers_programming_manual/page/n19
* [[Carr]] page on LDA: https://archive.org/details/6502UsersManual/page/n276
* [[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
* [[Leventhal]] page 3-71 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
* snes9x implementation of LDA: https://github.com/snes9xgit/snes9x/blob/master/cpuops.cpp#L678
* undisbeliever on LDA: https://undisbeliever.net/snesdev/65816-opcodes.html#lda-load-accumulator-from-memory
* undisbeliever on LDA: https://undisbeliever.net/snesdev/65816-opcodes.html#lda-load-accumulator-from-memory

Revision as of 10:53, 4 December 2023

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 Affected
N V M X D I Z C
. . . . . .

LDA (Load Accumulator) is a 65x instruction that loads the accumulator. In immediate addressing only, LDA is a total of 3 bytes long when the accumulator is 16 bits wide.

Cycle Penalties

See Also

External Links