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LDA: Difference between revisions

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(additional cycles)
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|A9
|A9
|2 bytes
|2 bytes
|2 cycles
|2 cycles*
|+
|+
|absolute
|absolute
|AD
|AD
|3 bytes
|3 bytes
|4 cycles
|4 cycles*
|+
|+
|absolute long
|absolute long
|AF
|AF
|4 bytes
|4 bytes
|5 cycles
|5 cycles*
|+
|+
|direct page
|direct page
|A5
|A5
|2 bytes
|2 bytes
|3 cycles
|3 cycles*
|+
|+
|direct page indirect
|direct page indirect
|B2
|B2
|2 bytes
|2 bytes
|5 cycles
|5 cycles*
|+
|+
|direct page indirect long
|direct page indirect long
|A7
|A7
|2 bytes
|2 bytes
|6 cycles
|6 cycles*
|+
|+
|absolute indexed by X
|absolute indexed by X
|BD
|BD
|3 bytes
|3 bytes
|4 cycles
|4 cycles*
|+
|+
|absolute long indexed by X
|absolute long indexed by X
|BF
|BF
|4 bytes
|4 bytes
|5 cycles
|5 cycles*
|+
|+
|absolute indexed by Y
|absolute indexed by Y
|B9
|B9
|3 bytes
|3 bytes
|4 cycles
|4 cycles*
|+
|+
|direct page indexed by X
|direct page indexed by X
|B5
|B5
|2 bytes
|2 bytes
|4 cycles
|4 cycles*
|+
|+
|direct page indexed indirect by X
|direct page indexed indirect by X
|A1
|A1
|2 bytes
|2 bytes
|6 cycles
|6 cycles*
|+
|+
|direct page indirect indexed by Y
|direct page indirect indexed by Y
|B1
|B1
|2 bytes
|2 bytes
|5 cycles
|5 cycles*
|+
|+
|direct page indirect long indexed by Y
|direct page indirect long indexed by Y
|B7
|B7
|2 bytes
|2 bytes
|6 cycles
|6 cycles*
|+
|+
|stack relative
|stack relative
|A3
|A3
|2 bytes
|2 bytes
|4 cycles
|4 cycles*
|+
|+
|stack relative indirect indexed by Y
|stack relative indirect indexed by Y
|B3
|B3
|2 bytes
|2 bytes
|7 cycles
|7 cycles*
|}
|}


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'''LDA''' (Load Accumulator) is a 65x instruction that loads the accumulator.
'''LDA''' (Load Accumulator) is a 65x instruction that loads the accumulator.  In all [[addressing modes]], LDA takes one extra cycle when the accumulator is 16 bits wide.  


=== See Also ===
=== See Also ===

Revision as of 00:06, 20 November 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 all addressing modes, LDA takes one extra cycle when the accumulator is 16 bits wide.

See Also

External Links

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