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ADC: Difference between revisions

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(where sum goes)
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The sum is stored in the accumulator.
The sum is stored in the accumulator.


After ADC runs, the [[carry flag]] will indicate whether the addition caused an unsigned overflow.
After ADC runs, the [[carry flag]] will indicate whether the addition caused an unsigned overflow.  The [[zero flag]] will be set if the sum is zero and cleared otherwise.


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

Revision as of 22:38, 28 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.

The sum is stored in the accumulator.

After ADC runs, the carry flag will indicate whether the addition caused an unsigned overflow. The zero flag will be set if the sum is zero and cleared otherwise.

See Also

External Links

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