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BEQ: Difference between revisions
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* [[Eyes & Lichty]], [https://archive.org/details/0893037893ProgrammingThe65816/page/430 page 430] on BEQ | * [[Eyes & Lichty]], [https://archive.org/details/0893037893ProgrammingThe65816/page/430 page 430] on BEQ | ||
* [[Labiak]], [https://archive.org/details/Programming_the_65816/page/n130 page 120] on BEQ | * [[Labiak]], [https://archive.org/details/Programming_the_65816/page/n130 page 120] on BEQ | ||
* [[MCS6500 Manual]] | * 4.1.2.4 on [[MCS6500 Manual]], [https://archive.org/details/mos_microcomputers_programming_manual/page/n56 page 41] on BEQ | ||
* [[Carr]], [https://archive.org/details/6502UsersManual/page/n262 page 249] on BEQ | * [[Carr]], [https://archive.org/details/6502UsersManual/page/n262 page 249] on BEQ | ||
* [[Leventhal]], [https://archive.org/details/6502-assembly-language-programming/page/n93 page 3-44] on BEQ | * [[Leventhal]], [https://archive.org/details/6502-assembly-language-programming/page/n93 page 3-44] on BEQ | ||
Revision as of 12:08, 8 August 2024
| Basic Info | |||||||
|---|---|---|---|---|---|---|---|
| Addressing Mode | Opcode | Length | Speed | ||||
| Program Counter Relative | F0 | 2 bytes | 2 cycles* | ||||
| Flags Affected | ||||||||
|---|---|---|---|---|---|---|---|---|
| N | V | M | X | D | I | Z | C | |
| . | . | . | . | . | . | . | . | |
BEQ (Branch if Equal) is a 65x instruction that performs a jump if the zero flag is set.
No flags are affected.
Syntax
BEQ nearlabel
Cycle Penalties
- BEQ takes an extra cycle if the branch is taken
- BEQ takes another extra cycle if the branch taken crosses a page boundary in emulation mode
See Also
External Links
- Eyes & Lichty, page 430 on BEQ
- Labiak, page 120 on BEQ
- 4.1.2.4 on MCS6500 Manual, page 41 on BEQ
- Carr, page 249 on BEQ
- Leventhal, page 3-44 on BEQ
- snes9x implementation of BEQ: https://github.com/snes9xgit/snes9x/blob/master/cpuops.cpp#L1370