ADC (Super FX): Difference between revisions

Revision as of 19:35, 10 July 2024


Basic Info
Addressing Mode	Opcode	Length	ROM Speed	RAM Speed	Cache Speed
Implied (type 1)	3D5n	2 bytes	6 cycles	6 cycles	2 cycles
Immediate	3F5n	2 bytes	6 cycles	6 cycles	2 cycles


Flags Affected
B	ALT1	ALT2	O/V	S	CY	Z
0	0	0

ADC (Add with carry) is a Super FX instruction that performs an addition. The source register is always the first addend. The second addend may be any of the 16 R registers or an immediate value. The third addend is CY. The sum is stored in the destination register.

The source and destination registers should be specified in advance using WITH, FROM, or TO. Otherwise, R₀ serves as the default.

Syntax

ADC Rn
ADC #n

Example 1

ADC   R₁    ; R₀ + R₁ + CY -> R₀
WITH  R₂    ; set the source/destination regs to R₂
ADC   R₃    ; R₂ + R₃ + CY -> R₂
ADC   R₂    ; R₀ + R₂ + CY -> R₀

Example 2

ADC    #9h             ; R₀ + 0009h + CY -> R₀
FROM   R₃              ; set the source reg to R₃
ADC    #5h             ; R₃ + 0005h + CY -> R₀
ADC    #0ah            ; R₀ + 000ah + CY -> R₀

External Links

Official Nintendo documentation on ADC: Page 2-9-3 of Book II
ADC with immediate addressing: Page 2-9-4 of Book II, lbid.

@@ Line 59: / Line 59: @@
   ADC   R<sub>3</sub>    ; R<sub>2</sub> + R<sub>3</sub> + CY -> R<sub>2</sub>
   ADC   R<sub>2</sub>    ; R<sub>0</sub> + R<sub>2</sub> + CY -> R<sub>0</sub>
+==== Example 2 ====
+ ADC    #9h             ; R<sub>0</sub> + 0009h + CY -> R<sub>0</sub>
+ FROM   R<sub>3</sub>              ; set the source reg to R<sub>3</sub>
+ ADC    #5h             ; R<sub>3</sub> + 0005h + CY -> R<sub>0</sub>
+ ADC    #0ah            ; R<sub>0</sub> + 000ah + CY -> R<sub>0</sub>
 === See Also ===