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'''ADC''' (Add with Carry/Borrow) is 65x instruction that performs an addition.
{| 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 Clobbered
!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

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