BPL (SPC700): Difference between revisions

Latest revision as of 21:58, 4 August 2024


Basic Info
Addressing Mode	Opcode	Length	Speed
Program Counter Relative	10	2 bytes	when condition is false: 2 cycles when condition is true: 4 cycles


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

BPL (Branch Plus) is an SPC700 instruction that performs a branch when the negative flag is clear. Note that zero is considered positive.

No flags are affected.

BPL rel

Where rel is a two's complement offset.

@@ Line 1: / Line 1: @@
-'''BPL''' is an [[SPC700]] instruction that performs a branch when the negative flag is clear.
+{| class="wikitable" style="float:right;clear:right;width:50%"
-{| class="wikitable" style="float:right;clear:right;width:30%"
 !colspan="8"|Basic Info
 |+
@@ Line 9: / Line 7: @@
 |'''Speed'''
 |+
-|relative
+|[[Program Counter Relative]]
 |10
 |2 bytes
-|2 or 4 cycles
+|when condition is false: 2 cycles
+when condition is true: 4 cycles
 |}
 {| 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 36: / Line 35: @@
 |.
 |}
+'''BPL''' (Branch Plus) is an [[SPC700]] instruction that performs a branch when the [[negative flag]] is clear.  Note that zero is considered positive.
+No flags are affected.
+==== Syntax ====
+<pre>
+BPL rel
+</pre>
+Where rel is a two's complement offset.
 === See Also ===
+* [[BMI (SPC700)]]
 * [[BPL]]
+=== References ===
+* Table C-15,  [https://archive.org/details/SNESDevManual/book1/page/n233 Appendix C-8 of Book I] of the official Super Nintendo development manual
+* anomie: https://github.com/yupferris/TasmShiz/blob/master/spc700.txt#L363
 [[Category:ASM]]
 [[Category:SPC700]]
 [[Category:Branching Commands]]