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COP: Difference between revisions
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'''COP''' (Co-Processor) is a [[65c816]] instruction designed to run a co-processor command. The byte following the opcode is called the [[Signature Byte]]. COP takes one | '''COP''' (Co-Processor) is a [[65c816]] instruction designed to run a co-processor command. The byte following the opcode is called the [[Signature Byte]]. The state of the [[interrupt disable flag]] has no effect on the behavior of COP. | ||
=====Cycle Penalty ===== | |||
* COP takes one extra cycle in [[native mode]]. | |||
=== See Also === | === See Also === | ||
Revision as of 09:43, 24 November 2023
| Basic Info | |||||||
|---|---|---|---|---|---|---|---|
| Addressing Mode | Opcode | Length | Speed | ||||
| Stack | 02 | 2 bytes | 7 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. The state of the interrupt disable flag has no effect on the behavior of COP.
Cycle Penalty
- COP takes one extra cycle in native mode.
See Also
External Links
- 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
- snes9x implementation of COP: https://github.com/snes9xgit/snes9x/blob/master/cpuops.cpp#L2738