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ADC: Difference between revisions
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''' | {| class="wikitable" style="float:right;clear:right;width:50%" | ||
!colspan="8"|Basic Info | |||
|+ | |||
|'''Addressing Mode''' | |||
|'''Opcode''' | |||
|'''Length''' | |||
|'''Speed''' | |||
|+ | |||
|[[Immediate]] | |||
|69 | |||
|2 bytes | |||
|2 cycles* | |||
|+ | |||
|[[Absolute]] | |||
|6D | |||
|3 bytes | |||
|4 cycles* | |||
|+ | |||
|[[Absolute Long Addressing|Absolute Long]] | |||
|6F | |||
|4 bytes | |||
|5 cycles* | |||
|+ | |||
|[[Direct Page Addressing|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* | |||
|} | |||
{| class="wikitable" style="float:right;clear:right;width:30%" | {| class="wikitable" style="float:right;clear:right;width:30%" | ||
!colspan="9"|Flags | !colspan="9"|Flags Affected | ||
|+ | |+ | ||
|N | |[[N Flag|N]] | ||
|V | |[[V Flag|V]] | ||
|M | |[[M Flag|M]] | ||
|X | |[[X Flag|X]] | ||
|D | |[[D Flag|D]] | ||
|I | |[[I Flag|I]] | ||
|Z | |[[Z Flag|Z]] | ||
|C | |[[C Flag|C]] | ||
|+ | |+ | ||
| | | | ||
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| | | | ||
|} | |} | ||
'''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 === | ||
* [[SBC]] | * [[SBC]] | ||
* [[ADC (SPC700)]] | |||
* [[ADC (Super FX)]] | |||
=== External Links === | |||
* [[Eyes & Lichty]] page 423, on ADC: https://archive.org/details/0893037893ProgrammingThe65816/page/n449 | |||
* [[Labiak]] page 115 on ADC: https://archive.org/details/Programming_the_65816/page/n125 | |||
* [[MCS6500 Manual]] page 7 on ADC: https://archive.org/details/mos_microcomputers_programming_manual/page/n22 | |||
* https://archive.org/details/mos_microcomputers_programming_manual/page/n204, lbid. | |||
* [[Carr]] page 245 on ADC: https://archive.org/details/6502UsersManual/page/n258 | |||
* [[Leventhal]] page 3-38 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 | |||
[[Category:ASM]] | [[Category:ASM]] | ||
[[Category:Group One Instructions]] | |||
[[Category:Inherited from 6502]] |
Latest revision as of 08:21, 19 December 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 423, on ADC: https://archive.org/details/0893037893ProgrammingThe65816/page/n449
- Labiak page 115 on ADC: https://archive.org/details/Programming_the_65816/page/n125
- MCS6500 Manual page 7 on ADC: https://archive.org/details/mos_microcomputers_programming_manual/page/n22
- https://archive.org/details/mos_microcomputers_programming_manual/page/n204, lbid.
- Carr page 245 on ADC: https://archive.org/details/6502UsersManual/page/n258
- Leventhal page 3-38 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