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ADC: Difference between revisions

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'''ADC''' (Add with Carry) is 65x instruction that performs an addition.
'''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 ===
=== See Also ===

Revision as of 01:07, 19 July 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 Clobbered
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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