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ADC: Difference between revisions
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{| class="wikitable" style="float:right;clear:right;width: | {| class="wikitable" style="float:right;clear:right;width:50%" | ||
!colspan="8"|Basic Info | !colspan="8"|Basic Info | ||
|+ | |+ | ||
Line 7: | Line 7: | ||
|'''Speed''' | |'''Speed''' | ||
|+ | |+ | ||
| | |[[Immediate]] | ||
|69 | |69 | ||
|2 bytes | |2 bytes | ||
|2 cycles | |2 cycles* | ||
|+ | |+ | ||
| | |[[Absolute]] | ||
|6D | |6D | ||
|3 bytes | |3 bytes | ||
|4 cycles | |4 cycles* | ||
|+ | |+ | ||
| | |[[Absolute Long Addressing|Absolute Long]] | ||
|6F | |6F | ||
|4 bytes | |4 bytes | ||
|5 cycles | |5 cycles* | ||
|+ | |+ | ||
| | |[[Direct Page Addressing|Direct Page]] | ||
|65 | |65 | ||
|2 bytes | |2 bytes | ||
|3 cycles | |3 cycles* | ||
|+ | |+ | ||
| | |[[Direct Page Indirect]] | ||
|72 | |72 | ||
|2 bytes | |2 bytes | ||
|5 cycles | |5 cycles* | ||
|+ | |+ | ||
| | |[[Direct Page Indirect Long]] | ||
|67 | |67 | ||
|2 bytes | |2 bytes | ||
|6 cycles | |6 cycles* | ||
|+ | |+ | ||
|absolute indexed by X | |absolute indexed by X | ||
|7D | |7D | ||
|3 bytes | |3 bytes | ||
|4 cycles | |4 cycles* | ||
|+ | |+ | ||
|absolute long indexed by X | |absolute long indexed by X | ||
|7F | |7F | ||
|4 bytes | |4 bytes | ||
|5 cycles | |5 cycles* | ||
|+ | |+ | ||
|absolute indexed by Y | |absolute indexed by Y | ||
|79 | |79 | ||
|3 bytes | |3 bytes | ||
|4 cycles | |4 cycles* | ||
|+ | |+ | ||
|direct page indexed by X | |direct page indexed by X | ||
|75 | |75 | ||
|2 bytes | |2 bytes | ||
|4 cycles | |4 cycles* | ||
|+ | |+ | ||
|direct page indexed indirect by X | |direct page indexed indirect by X | ||
|61 | |61 | ||
|2 bytes | |2 bytes | ||
|6 cycles | |6 cycles* | ||
|+ | |+ | ||
|direct page indirect indexed by Y | |direct page indirect indexed by Y | ||
|71 | |71 | ||
|2 bytes | |2 bytes | ||
|5 cycles | |5 cycles* | ||
|+ | |+ | ||
|direct page indirect long indexed by Y | |direct page indirect long indexed by Y | ||
|77 | |77 | ||
|2 bytes | |2 bytes | ||
|6 cycles | |6 cycles* | ||
|+ | |+ | ||
| | |[[Stack Relative]] | ||
|63 | |63 | ||
|2 bytes | |2 bytes | ||
|4 cycles | |4 cycles* | ||
|+ | |+ | ||
|stack relative indirect indexed by Y | |stack relative indirect indexed by Y | ||
|73 | |73 | ||
|2 bytes | |2 bytes | ||
|7 cycles | |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. | '''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 === | === External Links === | ||
* [[Eyes & Lichty]] page on ADC: https://archive.org/details/0893037893ProgrammingThe65816/page/n449 | * [[Eyes & Lichty]] page 423, on ADC: https://archive.org/details/0893037893ProgrammingThe65816/page/n449 | ||
* [[Labiak]] page on ADC: https://archive.org/details/Programming_the_65816/page/n125 | * [[Labiak]] page 115 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 | * [[MCS6500 Manual]] page 7 on ADC: https://archive.org/details/mos_microcomputers_programming_manual/page/n22 | ||
* [[Carr]] page on ADC: https://archive.org/details/6502UsersManual/page/ | * https://archive.org/details/mos_microcomputers_programming_manual/page/n204, lbid. | ||
* [[Leventhal]] page on ADC: https://archive.org/details/6502-assembly-language-programming/page/n87 | * [[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 | * undisbeliever on ADC: https://undisbeliever.net/snesdev/65816-opcodes.html#adc-add-with-carry | ||
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