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BVC: Difference between revisions
From SnesLab
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=== External Links === | === External Links === | ||
* [[Eyes & Lichty]] page on BVC: https://archive.org/details/0893037893ProgrammingThe65816/page/n465 | * [[Eyes & Lichty]] page 439 on BVC: https://archive.org/details/0893037893ProgrammingThe65816/page/n465 | ||
* [[Labiak]] page on BVC: https://archive.org/details/Programming_the_65816/page/n138 | * [[Labiak]] page on BVC: https://archive.org/details/Programming_the_65816/page/n138 | ||
* [[MCS6500 Manual]] page on BVC: https://archive.org/details/mos_microcomputers_programming_manual/page/n56 | * [[MCS6500 Manual]] page on BVC: https://archive.org/details/mos_microcomputers_programming_manual/page/n56 | ||
Revision as of 03:36, 25 November 2023
| Basic Info | |||||||
|---|---|---|---|---|---|---|---|
| Addressing Mode | Opcode | Length | Speed | ||||
| relative | 50 | 2 byte | 2 cycles* | ||||
| Flags Affected | ||||||||
|---|---|---|---|---|---|---|---|---|
| N | V | M | X | D | I | Z | C | |
| . | . | . | . | . | . | . | . | |
BVC is a 65x instruction that performs a branch if the overflow flag is clear.
Cycle Penalties
- BVC takes one extra cycle if the branch is taken
- BVC takes another extra cycle if that branch taken crosses a page boundary in emulation mode.
See Also
External Links
- Eyes & Lichty page 439 on BVC: https://archive.org/details/0893037893ProgrammingThe65816/page/n465
- Labiak page on BVC: https://archive.org/details/Programming_the_65816/page/n138
- MCS6500 Manual page on BVC: https://archive.org/details/mos_microcomputers_programming_manual/page/n56
- Carr page on BVC: https://archive.org/details/6502UsersManual/page/n265
- Leventhal page on BVC: https://archive.org/details/6502-assembly-language-programming/page/n100
- snes9x implementation of BVC: https://github.com/snes9xgit/snes9x/blob/master/cpuops.cpp#L1395