|  ADC |
Reference/6502 Programming/Assembly
ADC (ADd with Carry)
Affects Flags: S V Z C
ADC adds the parameter to the Accumulator. ADC results are dependant on the setting of the decimal flag. In decimal mode, addition is carried out on the assumption that the values involved are packed BCD (Binary Coded Decimal). There is no way to add without carry.
| Addressing mode | Syntax | Opcode | Bytes | Cycles | | Immediate addressing mode | ADC #$44 | $69 | 2 | 2 | | Zero Page | ADC $44 | $65 | 2 | 3 | | Zero Page,X | ADC $44,X | $75 | 2 | 4 | | Absolute | ADC $4400 | $6D | 3 | 4 | | Absolute,X | ADC $4400,X | $7D | 3 | 4+ | | Absolute,Y | ADC $4400,Y | $79 | 3 | 4+ | | Indirect,X | ADC ($44,X) | $61 | 2 | 6 | | Indirect,Y | ADC ($44),Y | $71 | 2 | 5+ |
+ add 1 cycle if page boundary crossed
SBC |
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