BNE: Difference between revisions

Latest revision as of 06:48, 7 December 2023


Basic Info
Addressing Mode	Opcode	Length	Speed
Program Counter Relative	D0	2 byte	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.

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.

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

@@ Line 1: / Line 1: @@
-{| class="wikitable" style="float:right;clear:right;width:30%"
+{| class="wikitable" style="float:right;clear:right;width:40%"
 !colspan="8"|Basic Info
 |+
@@ Line 7: / Line 7: @@
 |'''Speed'''
 |+
-|relative
+|[[Program Counter Relative]]
 |D0
 |2 byte
-|3 cycles
+|2 cycles*
 |}
 {| class="wikitable" style="float:right;clear:right;width:30%"
-!colspan="9"|Flags Clobbered
+!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]]
 |+
 |.
@@ Line 35: / Line 35: @@
 |}
-'''BNE''' (Branch if Not Equal) is a 65x instruction that performs a jump if the [[zero flag]] is clear.
+'''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.
+===== 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 ===
 * [[BPL]]
+* [[BNE (SPC700)]]
+* [[BNE (Super FX)]]
 === External Links ===
-* [[Eyes & Lichty]] page on BNE: https://archive.org/details/0893037893ProgrammingThe65816/page/n459
+* [[Eyes & Lichty]] page 433, on BNE: https://archive.org/details/0893037893ProgrammingThe65816/page/n459
-* [[Labiak]] page on BNE: https://archive.org/details/Programming_the_65816/page/n133
+* [[Labiak]] page 123 on BNE: https://archive.org/details/Programming_the_65816/page/n133
-* [[MCS6500 Manual]] page on BNE: https://archive.org/details/mos_microcomputers_programming_manual/page/n56
+* [[MCS6500 Manual]] page 41 on BNE: https://archive.org/details/mos_microcomputers_programming_manual/page/n56
-* [[Carr]] page on BNE: https://archive.org/details/6502UsersManual/page/n263
+* [[Carr]] page 251 on BNE: https://archive.org/details/6502UsersManual/page/n264
-* [[Leventhal]] page on BNE: https://archive.org/details/6502-assembly-language-programming/page/n96
+* [[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
 [[Category:ASM]]
 [[Category:Inherited from 6502]]
+[[Category:Conditional Branches]]
+[[Category:Two-byte Instructions]]