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BNE: Difference between revisions

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'''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.
'''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.
If the zero flag is set, control simply falls through to the instruction following BNE.


No flags are affected.
No flags are affected.
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</pre>


===== Cycle Penalties =====
==== Cycle Penalties ====
* BNE takes one additional cycle if the branch is taken
* 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]].  
* BNE takes another extra cycle if that branch taken crosses a page boundary in [[emulation mode]].  
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=== External Links ===
=== External Links ===
* [[Eyes & Lichty]] page 433, on BNE: https://archive.org/details/0893037893ProgrammingThe65816/page/n459
* [[Eyes & Lichty]], [https://archive.org/details/0893037893ProgrammingThe65816/page/433 page 433] on BNE
* [[Labiak]] page 123 on BNE: https://archive.org/details/Programming_the_65816/page/n133
* [[Labiak]], [https://archive.org/details/Programming_the_65816/page/n133 page 123] on BNE
* [[MCS6500 Manual]] page 41 on BNE: https://archive.org/details/mos_microcomputers_programming_manual/page/n56
* 4.1.2.6 on [[MCS6500 Manual]], [https://archive.org/details/mos_microcomputers_programming_manual/page/n56 page 41] on BNE
* [[Carr]] page 251 on BNE: https://archive.org/details/6502UsersManual/page/n264
* [[Carr]], [https://archive.org/details/6502UsersManual/page/n264 page 251] on BNE
* [[Leventhal]] page 3-47 on BNE: https://archive.org/details/6502-assembly-language-programming/page/n96
* [[Leventhal]], [https://archive.org/details/6502-assembly-language-programming/page/n96 page 3-47] on BNE
* snes9x implementation of BNE: https://github.com/snes9xgit/snes9x/blob/master/cpuops.cpp#L1380
* snes9x implementation of BNE: https://github.com/snes9xgit/snes9x/blob/master/cpuops.cpp#L1380



Latest revision as of 20:56, 15 August 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.

If the zero flag is set, control simply falls through to the instruction following BNE.

No flags are affected.

Syntax

BNE nearlabel

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