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COP: Difference between revisions
From SnesLab
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=== External Links === | === External Links === | ||
* [[Eyes & Lichty]] page 447, on COP: https://archive.org/details/0893037893ProgrammingThe65816/page/n473 | * [[Eyes & Lichty]] page 447, on COP: https://archive.org/details/0893037893ProgrammingThe65816/page/n473 | ||
* [[Labiak]] page on COP: https://archive.org/details/Programming_the_65816/page/n145 | * [[Labiak]] page 135 on COP: https://archive.org/details/Programming_the_65816/page/n145 | ||
* snes9x implementation of COP: https://github.com/snes9xgit/snes9x/blob/master/cpuops.cpp#L2738 | * snes9x implementation of COP: https://github.com/snes9xgit/snes9x/blob/master/cpuops.cpp#L2738 | ||
[[Category:ASM]] | [[Category:ASM]] | ||
[[Category:65c816 additions]] | [[Category:65c816 additions]] | ||
Revision as of 10:25, 27 November 2023
| Basic Info | |||||||
|---|---|---|---|---|---|---|---|
| Addressing Mode | Opcode | Length | Speed | ||||
| Stack | 02 | 2 bytes | 8 cycles* | ||||
| Flags Affected | ||||||||
|---|---|---|---|---|---|---|---|---|
| N | V | M | X | D | I | Z | C | |
| . | . | . | . | 0 | 1 | . | . | |
COP (Co-Processor) is a 65c816 instruction designed to run a co-processor command. The byte following the opcode is called the Signature Byte. Signature bytes of 80h to FFh are reserved by the Western Design Center. The state of the interrupt disable flag has no effect on the behavior of COP.
Cycle Skipped
- COP takes one fewer cycle in emulation mode as it doesn't need to push the program counter bank register to the stack.
See Also
External Links
- Eyes & Lichty page 447, on COP: https://archive.org/details/0893037893ProgrammingThe65816/page/n473
- Labiak page 135 on COP: https://archive.org/details/Programming_the_65816/page/n145
- snes9x implementation of COP: https://github.com/snes9xgit/snes9x/blob/master/cpuops.cpp#L2738