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BPL (SPC700): Difference between revisions
From SnesLab
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{| class="wikitable" style="float:right;clear:right;width: | |||
!colspan="8"|Basic Info | !colspan="8"|Basic Info | ||
|+ | |+ | ||
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|'''Speed''' | |'''Speed''' | ||
|+ | |+ | ||
| | |[[Program Counter Relative]] | ||
|10 | |10 | ||
|2 bytes | |2 bytes | ||
|2 | |when condition is false: 2 cycles | ||
when condition is true: 4 cycles | |||
|} | |} | ||
{| class="wikitable" style="float:right;clear:right;width:30%" | {| class="wikitable" style="float:right;clear:right;width:30%" | ||
!colspan="8"|Flags | !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]] | ||
|+ | |+ | ||
|. | |. | ||
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|. | |. | ||
|} | |} | ||
'''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 === | === See Also === | ||
| Line 42: | Line 52: | ||
=== References === | === References === | ||
* [https://archive.org/details/SNESDevManual/book1/page/n233 Appendix C-8 of Book I] of the official Super Nintendo development manual | * 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:ASM]] | ||
[[Category:SPC700]] | [[Category:SPC700]] | ||
[[Category:Branching Commands]] | [[Category:Branching Commands]] | ||
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.
Syntax
BPL rel
Where rel is a two's complement offset.
See Also
References
- Table C-15, Appendix C-8 of Book I of the official Super Nintendo development manual
- anomie: https://github.com/yupferris/TasmShiz/blob/master/spc700.txt#L363