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ADC: Difference between revisions

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(linkify another admode)
(linkify admodes)
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|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

Revision as of 22:31, 26 June 2024

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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