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ADC: Difference between revisions
From SnesLab
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!colspan="9"|Flags | !colspan="9"|Flags Affected | ||
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|N | |N | ||
Revision as of 02:43, 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
- Eyes & Lichty page on ADC: https://archive.org/details/0893037893ProgrammingThe65816/page/n449
- Labiak page on ADC: https://archive.org/details/Programming_the_65816/page/n125
- MCS6500 Manual page on ADC: https://archive.org/details/mos_microcomputers_programming_manual/page/n22
- Carr page on ADC: https://archive.org/details/6502UsersManual/page/n257
- Leventhal page on ADC: https://archive.org/details/6502-assembly-language-programming/page/n87
- undisbeliever on ADC: https://undisbeliever.net/snesdev/65816-opcodes.html#adc-add-with-carry