OR (SPC700): Difference between revisions

Latest revision as of 14:07, 30 July 2024


Basic Info
Addressing Mode	Opcode	Length	Speed
Immediate	08	2 bytes	2 cycles
Implied (type 1)	06	1 byte	3 cycles
Direct Page	04	2 bytes	3 cycles
Direct Page Indexed by X	14	2 bytes	4 cycles
Absolute	05	3 bytes	4 cycles
Absolute Indexed by X	15	3 bytes	5 cycles
Absolute Indexed by Y	16	3 bytes	5 cycles
Direct Page Indexed by X	07	2 bytes	6 cycles
Direct Page Indirect Indexed by Y	17	2 bytes	6 cycles
Implied Indirect (type 1)	19	1 bytes	5 cycles
Direct Page	09	3 bytes	6 cycles
Direct Page Immediate	18	3 bytes	5 cycles


Flags Affected
N	V	P	B	H	I	Z	C
N	.	.	.	.	.	Z	.

OR is an SPC700 instruction that performs a logical or.

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

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

External Links

Official Super Nintendo development manual on OR: Table C-8 in Appendix C-6 of Book I
anomie: https://github.com/yupferris/TasmShiz/blob/master/spc700.txt#L518

@@ Line 1: / Line 1: @@
-{| class="wikitable" style="float:right;clear:right;width:40%"
+{| class="wikitable" style="float:right;clear:right;width:45%"
 !colspan="8"|Basic Info
 |+
@@ Line 12: / Line 12: @@
 |2 cycles
 |+
-|
+|[[Implied]] (type 1)
 |06
 |1 byte
 |3 cycles
 |+
-|
+|[[Direct Page Addressing | Direct Page]]
 |04
 |2 bytes
 |3 cycles
 |+
-|
+|[[Direct Page Indexed by X]]
 |14
 |2 bytes
 |4 cycles
 |+
-|
+|[[Absolute Addressing | Absolute]]
 |05
 |3 bytes
 |4 cycles
 |+
-|
+|[[Absolute Indexed by X]]
 |15
 |3 bytes
 |5 cycles
 |+
-|
+|[[Absolute Indexed by Y]]
 |16
 |3 bytes
 |5 cycles
 |+
-|
+|[[Direct Page Indexed by X]]
 |07
 |2 bytes
 |6 cycles
 |+
-|
+|[[Direct Page Indirect Indexed by Y]]
 |17
 |2 bytes
 |6 cycles
 |+
-|
+|[[Implied Indirect]] (type 1)
 |19
 |1 bytes
 |5 cycles
 |+
-|
+|[[Direct Page]]
 |09
 |3 bytes
 |6 cycles
 |+
-|
+|[[Direct Page Immediate]]
 |18
 |3 bytes
@@ Line 70: / Line 70: @@
 {| class="wikitable" style="float:right;clear:right;width:30%"
 !colspan="8"|Flags Affected
+|+
+|[[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]]
 |+
 |N
-|V
-|P
-|B
-|H
-|I
-|Z
-|C
-|+
-|
 |.
 |.
@@ Line 86: / Line 86: @@
 |.
 |.
-|
+|Z
 |.
 |}
 '''OR''' is an [[SPC700]] instruction that performs a logical or.
+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>
+OR A, #imm
+OR A, (X)
+OR A, dp
+OR A, dp+X
+OR A, !abs
+OR A, !abs+X
+OR A, !abs+Y
+OR A, [dp+X]
+OR A, [dp]+Y
+OR (X), (Y)
+OR dp<d>, dp<s>
+OR dp, #imm
+</pre>
 === See Also ===
@@ Line 96: / Line 114: @@
 * [[AND (SPC700)]]
 * [[EOR (SPC700)]]
+* [[OR (Super FX)]]
 === External Links ===
-* Official Super Nintendo development manual on OR: [https://archive.org/details/SNESDevManual/book1/page/n231 Appendix C-6 of Book I]
+* Official Super Nintendo development manual on OR: Table C-8 in [https://archive.org/details/SNESDevManual/book1/page/n231 Appendix C-6 of Book I]
+* anomie: https://github.com/yupferris/TasmShiz/blob/master/spc700.txt#L518
 [[Category:ASM]]
 [[Category:SPC700]]
 [[Category:8-bit Logic Operation Commands]]
+[[Category:Read-Modify-Write Instructions]]