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ADC (SPC700): Difference between revisions

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{| class="wikitable" style="float:right;clear:right;width:40%"
{| class="wikitable" style="float:right;clear:right;width:45%"
!colspan="8"|Basic Info
!colspan="8"|Basic Info
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|'''Speed'''
|'''Speed'''
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|immediate
|[[Immediate]]
|88
|88
|2 bytes
|2 bytes
|2 cycles
|2 cycles
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|+
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|[[Implied]] (type 1)
|86
|86
|1 byte
|1 byte
|3 cycles
|3 cycles
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|[[Direct Page Addressing | Direct Page]]
|84
|84
|2 bytes
|2 bytes
|3 cycles
|3 cycles
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|[[Direct Page Indexed by X]]
|94
|94
|2 bytes
|2 bytes
|3 cycles
|3 cycles
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|[[Absolute Addressing | Absolute]]
|85
|85
|3 bytes
|3 bytes
|4 cycles
|4 cycles
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|+
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|[[Absolute Indexed by X]]
|95
|95
|3 bytes
|3 bytes
|5 cycles
|5 cycles
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|[[Absolute Indexed by Y]]
|96
|96
|3 bytes
|3 bytes
|5 cycles
|5 cycles
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|[[Direct Page Indexed by X]]
|87
|87
|2 bytes
|2 bytes
|6 cycles
|6 cycles
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|[[Direct Page Indirect Indexed by Y]]
|97
|97
|2 bytes
|2 bytes
|6 cycles
|6 cycles
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|[[Implied]] (type 1)
|99
|99
|1 byte
|1 byte
|5 cycles
|5 cycles
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|[[Direct Page]]
|89
|89
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|6 cycles
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|[[Direct Page Immediate]]
|98
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|3 bytes
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{| class="wikitable" style="float:right;clear:right;width:30%"
{| class="wikitable" style="float:right;clear:right;width:30%"
!colspan="8"|Flags Clobbered
!colspan="8"|Flags Affected
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|[[Negative Flag|N]]
|[[Overflow Flag|V]]
|[[Direct Page Flag|P]]
|[[Break Flag|B]]
|[[Half-Carry Flag|H]]
|[[Interrupt Enable Flag|I]]
|[[Zero Flag|Z]]
|[[Carry Flag|C]]
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|+
|N
|N
|V
|V
|P
|.
|B
|.
|H
|H
|I
|.
|Z
|Z
|C
|C
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|}


'''ADC''' is an [[SPC700]] instruction that adds.
'''ADC''' (Add with Carry) is an [[SPC700]] instruction that adds the value of the two operands together (along with the [[carry flag]]) and stores the sum in the left operand.  Often, the left operand is the accumulator.
 
The operands are stored in the instruction stream in the opposite order they appear in the assembler source. In the assembler source, the operand on the right is the source and the operand on the left is the destination.
 
==== Syntax ====
<pre>
ADC A, #imm
ADC A, (X)
ADC A, dp
ADC A, dp+X
ADC A, !abs
ADC A, !abs+X
ADC A, !abs+Y
ADC A, [dp+X]
ADC A, [dp]+Y
ADC (X), (Y)
ADC dp<d>, dp<s>
ADC dp, #imm
</pre>
 
Unlike the [[65c816]], the SPC700 has no [[decimal mode]], so the addition is always done in binary/hexadecimal.  Use [[DAA]] after adding [[BCD]]-encoded data to repair it back to BCD.


=== See Also ===
=== See Also ===
* [[SBC (SPC700)]]
* [[SBC (SPC700)]]
* [[CLRC]]
* [[ADDW]]
* [[ADC]]
* [[ADC]]


=== External Links ===
=== External Links ===
* Official Super Nintendo development manual on ADC: [https://archive.org/details/SNESDevManual/book1/page/n230 Appendix C-5 of Book I]
* Official Super Nintendo development manual on ADC: Table C-7 in [https://archive.org/details/SNESDevManual/book1/page/n230 Appendix C-5 of Book I]
* anomie: https://github.com/yupferris/TasmShiz/blob/8fabc9764c33a7ae2520a76d80ed7220bb939f12/spc700.txt#L304


[[Category:ASM]]
[[Category:ASM]]
[[Category:SPC700]]
[[Category:SPC700]]
[[Category:8-bit Arithmetic Operation Commands]]

Latest revision as of 08:53, 19 September 2024

Basic Info
Addressing Mode Opcode Length Speed
Immediate 88 2 bytes 2 cycles
Implied (type 1) 86 1 byte 3 cycles
Direct Page 84 2 bytes 3 cycles
Direct Page Indexed by X 94 2 bytes 3 cycles
Absolute 85 3 bytes 4 cycles
Absolute Indexed by X 95 3 bytes 5 cycles
Absolute Indexed by Y 96 3 bytes 5 cycles
Direct Page Indexed by X 87 2 bytes 6 cycles
Direct Page Indirect Indexed by Y 97 2 bytes 6 cycles
Implied (type 1) 99 1 byte 5 cycles
Direct Page 89 3 bytes 6 cycles
Direct Page Immediate 98 3 bytes 5 cycles
Flags Affected
N V P B H I Z C
N V . . H . Z C

ADC (Add with Carry) is an SPC700 instruction that adds the value of the two operands together (along with the carry flag) and stores the sum in the left operand. Often, the left operand is the accumulator.

The operands are stored in the instruction stream in the opposite order they appear in the assembler source. In the assembler source, the operand on the right is the source and the operand on the left is the destination.

Syntax

ADC A, #imm
ADC A, (X)
ADC A, dp
ADC A, dp+X
ADC A, !abs
ADC A, !abs+X
ADC A, !abs+Y
ADC A, [dp+X]
ADC A, [dp]+Y
ADC (X), (Y)
ADC dp<d>, dp<s>
ADC dp, #imm

Unlike the 65c816, the SPC700 has no decimal mode, so the addition is always done in binary/hexadecimal. Use DAA after adding BCD-encoded data to repair it back to BCD.

See Also

External Links

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