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ADC: Difference between revisions

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(clobbered -> affected)
(added asterisks to number of cycles)
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|69
|69
|2 bytes
|2 bytes
|2 cycles
|2 cycles*
|+
|+
|absolute
|absolute
|6D
|6D
|3 bytes
|3 bytes
|4 cycles
|4 cycles*
|+
|+
|absolute long
|absolute long
|6F
|6F
|4 bytes
|4 bytes
|5 cycles
|5 cycles*
|+
|+
|direct page
|direct page
|65
|65
|2 bytes
|2 bytes
|3 cycles
|3 cycles*
|+
|+
|direct page indirect
|direct page indirect
|72
|72
|2 bytes
|2 bytes
|5 cycles
|5 cycles*
|+
|+
|direct page indirect long
|direct page indirect long
|67
|67
|2 bytes
|2 bytes
|6 cycles
|6 cycles*
|+
|+
|absolute indexed by X
|absolute indexed by X
|7D
|7D
|3 bytes
|3 bytes
|4 cycles
|4 cycles*
|+
|+
|absolute long indexed by X
|absolute long indexed by X
|7F
|7F
|4 bytes
|4 bytes
|5 cycles
|5 cycles*
|+
|+
|absolute indexed by Y
|absolute indexed by Y
|79
|79
|3 bytes
|3 bytes
|4 cycles
|4 cycles*
|+
|+
|direct page indexed by X
|direct page indexed by X
|75
|75
|2 bytes
|2 bytes
|4 cycles
|4 cycles*
|+
|+
|direct page indexed indirect by X
|direct page indexed indirect by X
|61
|61
|2 bytes
|2 bytes
|6 cycles
|6 cycles*
|+
|+
|direct page indirect indexed by Y
|direct page indirect indexed by Y
|71
|71
|2 bytes
|2 bytes
|5 cycles
|5 cycles*
|+
|+
|direct page indirect long indexed by Y
|direct page indirect long indexed by Y
|77
|77
|2 bytes
|2 bytes
|6 cycles
|6 cycles*
|+
|+
|stack relative
|stack relative
|63
|63
|2 bytes
|2 bytes
|4 cycles
|4 cycles*
|+
|+
|stack relative indirect indexed by Y
|stack relative indirect indexed by Y
|73
|73
|2 bytes
|2 bytes
|7 cycles
|7 cycles*
|}
|}


Revision as of 02:44, 20 November 2023

Basic Info
Addressing Mode Opcode Length Speed
Immediate 69 2 bytes 2 cycles*
absolute 6D 3 bytes 4 cycles*
absolute long 6F 4 bytes 5 cycles*
direct page 65 2 bytes 3 cycles*
direct page indirect 72 2 bytes 5 cycles*
direct page indirect long 67 2 bytes 6 cycles*
absolute indexed by X 7D 3 bytes 4 cycles*
absolute long indexed by X 7F 4 bytes 5 cycles*
absolute indexed by Y 79 3 bytes 4 cycles*
direct page indexed by X 75 2 bytes 4 cycles*
direct page indexed indirect by X 61 2 bytes 6 cycles*
direct page indirect indexed by Y 71 2 bytes 5 cycles*
direct page indirect long indexed by Y 77 2 bytes 6 cycles*
stack relative 63 2 bytes 4 cycles*
stack relative indirect indexed by Y 73 2 bytes 7 cycles*
Flags Affected
N V M X D I Z C
. . . .

ADC (Add with Carry) is 65x instruction that performs an addition. As there is no add-without-carry instruction, a CLC should be run (or the carry flag otherwise ensured to be clear) before an ADC, or else the sum will be one greater than expected.

See Also

External Links

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