JMP (SPC700): Difference between revisions

Latest revision as of 21:56, 13 July 2024


Basic Info
Addressing Mode	Opcode	Length	Speed
Absolute	5F	3 bytes	3 cycles
Absolute Indexed by X	1F	3 bytes	6 cycles


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

JMP is an SPC700 instruction that performs an unconditional branch.

With absolute addressing, the SPC jumps to the address specified in the two bytes following the 5F opcode.

With absolute indexed by X addressing, the SPC jumps to the effective address specified by the two bytes following the 1F opcode plus the value in the X index register.

No flags are affected.

Syntax

JMP !abs
JMP [!abs+X]

External Links

Official Super Nintendo development manual on JMP: Table C-15, Appendix C-8 of Book I
anomie: https://github.com/yupferris/TasmShiz/blob/master/spc700.txt#L454

@@ Line 19: / Line 19: @@
 {| class="wikitable" style="float:right;clear:right;width:30%"
-!colspan="8"|Flags Clobbered
+!colspan="8"|Flags Affected
 |+
-|N
+|[[Negative Flag|N]]
-|V
+|[[Overflow Flag|V]]
-|P
+|[[Direct Page Flag|P]]
-|B
+|[[Break Flag|B]]
-|H
+|[[Half-Carry Flag|H]]
-|I
+|[[Interrupt Enable Flag|I]]
-|Z
+|[[Zero Flag|Z]]
-|C
+|[[Carry Flag|C]]
 |+
 |.
@@ Line 45: / Line 45: @@
 With absolute indexed by X addressing, the SPC jumps to the effective address specified by the two bytes following the 1F opcode plus the value in the [[X index register]].
+No flags are affected.
+==== Syntax ====
+<pre>
+JMP !abs
+JMP [!abs+X]
+</pre>
 === See Also ===
@@ Line 51: / Line 59: @@
 === External Links ===
-* Official Super Nintendo development manual on JMP: [https://archive.org/details/SNESDevManual/book1/page/n234 Appendix C-8 of Book I]
+* Official Super Nintendo development manual on JMP: Table C-15, [https://archive.org/details/SNESDevManual/book1/page/n233 Appendix C-8 of Book I]
+* anomie: https://github.com/yupferris/TasmShiz/blob/master/spc700.txt#L454
 [[Category:ASM]]
 [[Category:SPC700]]
 [[Category:Branching Commands]]
+[[Category:Three-byte Instructions]]