ADC (SPC700): Difference between revisions

Revision as of 17:20, 24 July 2023


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 Clobbered
N	V	P	B	H	I	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.

External Links

Official Super Nintendo development manual on ADC: Appendix C-5 of Book I

@@ Line 91: / Line 91: @@
 '''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.
 === See Also ===