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BRA: Difference between revisions
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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''' | ||
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| | |[[Program Counter Relative]] | ||
|80 | |80 | ||
|2 byte | |2 byte | ||
|3 cycles | |3 cycles* | ||
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{| class="wikitable" style="float:right;clear:right;width:30%" | {| class="wikitable" style="float:right;clear:right;width:30%" | ||
!colspan="9"|Flags | !colspan="9"|Flags Affected | ||
|+ | |+ | ||
|N | |[[Negative Flag|N]] | ||
|V | |[[Overflow Flag|V]] | ||
|M | |[[M Flag|M]] | ||
|X | |[[X Flag|X]] | ||
|D | |[[Decimal Flag|D]] | ||
|I | |[[I Flag|I]] | ||
|Z | |[[Zero Flag|Z]] | ||
|C | |[[Carry Flag|C]] | ||
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'''BRA''' (BRanch Always) is a [[65c816]] instruction that performs an unconditional jump. The signed displacement ranges from -128 to 127. | |||
BRA is relocatable. | |||
===== Cycle Penalty ===== | |||
* BRA takes one additional cycle if the branch crosses a page boundary in [[emulation mode]]. | |||
=== See Also === | |||
* [[JMP]] | |||
* [[BRA (Super FX)]] | |||
=== External Links === | === External Links === | ||
* [[Eyes & Lichty]] page on BRA: https://archive.org/details/0893037893ProgrammingThe65816/page/n461 | * [[Eyes & Lichty]] page 435, on BRA: https://archive.org/details/0893037893ProgrammingThe65816/page/n461 | ||
* [[Labiak]] page 125 on BRA: https://archive.org/details/Programming_the_65816/page/n135 | |||
* snes9x implementation of BRA: https://github.com/snes9xgit/snes9x/blob/master/cpuops.cpp#L1390 | |||
[[Category:ASM]] | [[Category:ASM]] | ||
[[Category:65c02 additions]] | [[Category:65c02 additions]] | ||
[[Category:Unconditional Branches]] | |||
[[Category:Two-byte Instructions]] | |||
[[Category:Relocatable Instructions]] | |||
[[Category:Single Admode Mnemonics]] | |||
Latest revision as of 12:45, 14 December 2023
| Basic Info | |||||||
|---|---|---|---|---|---|---|---|
| Addressing Mode | Opcode | Length | Speed | ||||
| Program Counter Relative | 80 | 2 byte | 3 cycles* | ||||
| Flags Affected | ||||||||
|---|---|---|---|---|---|---|---|---|
| N | V | M | X | D | I | Z | C | |
| . | . | . | . | . | . | . | . | |
BRA (BRanch Always) is a 65c816 instruction that performs an unconditional jump. The signed displacement ranges from -128 to 127.
BRA is relocatable.
Cycle Penalty
- BRA takes one additional cycle if the branch crosses a page boundary in emulation mode.
See Also
External Links
- Eyes & Lichty page 435, on BRA: https://archive.org/details/0893037893ProgrammingThe65816/page/n461
- Labiak page 125 on BRA: https://archive.org/details/Programming_the_65816/page/n135
- snes9x implementation of BRA: https://github.com/snes9xgit/snes9x/blob/master/cpuops.cpp#L1390