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BNE: Difference between revisions
From SnesLab
(no flags affected) |
(pluralize bytes) |
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| Line 9: | Line 9: | ||
|[[Program Counter Relative]] | |[[Program Counter Relative]] | ||
|D0 | |D0 | ||
|2 | |2 bytes | ||
|2 cycles* | |2 cycles* | ||
|} | |} | ||
Revision as of 22:03, 6 July 2024
| Basic Info | |||||||
|---|---|---|---|---|---|---|---|
| Addressing Mode | Opcode | Length | Speed | ||||
| Program Counter Relative | D0 | 2 bytes | 2 cycles* | ||||
| Flags Affected | ||||||||
|---|---|---|---|---|---|---|---|---|
| N | V | M | X | D | I | Z | C | |
| . | . | . | . | . | . | . | . | |
BNE (Branch if Not Equal) is a 65x instruction that performs a jump if the zero flag is clear. The displacement may be -128 to 127.
No flags are affected.
Cycle Penalties
- BNE takes one additional cycle if the branch is taken
- BNE takes another extra cycle if that branch taken crosses a page boundary in emulation mode.
See Also
External Links
- Eyes & Lichty page 433, on BNE: https://archive.org/details/0893037893ProgrammingThe65816/page/n459
- Labiak page 123 on BNE: https://archive.org/details/Programming_the_65816/page/n133
- MCS6500 Manual page 41 on BNE: https://archive.org/details/mos_microcomputers_programming_manual/page/n56
- Carr page 251 on BNE: https://archive.org/details/6502UsersManual/page/n264
- Leventhal page 3-47 on BNE: https://archive.org/details/6502-assembly-language-programming/page/n96
- snes9x implementation of BNE: https://github.com/snes9xgit/snes9x/blob/master/cpuops.cpp#L1380