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CPY
From SnesLab
| Basic Info | |||||||
|---|---|---|---|---|---|---|---|
| Addressing Mode | Opcode | Length | Speed | ||||
| immediate | C0 | 2 bytes | 2 cycles | ||||
| absolute | CC | 3 bytes | 4 cycles | ||||
| direct page | C4 | 2 bytes | 3 cycles | ||||
| Flags Affected | ||||||||
|---|---|---|---|---|---|---|---|---|
| N | V | M | X | D | I | Z | C | |
| . | . | . | . | . | ||||
CPY (Compare Y) is a 65x instruction that compares the value of the Y index register.
See Also
External Links
- Eyes & Lichty page on CPY: https://archive.org/details/0893037893ProgrammingThe65816/page/n576
- Labiak page on CPY: https://archive.org/details/Programming_the_65816/page/n147
- MCS6500 Manual page on CPY: https://archive.org/details/mos_microcomputers_programming_manual/page/n117
- Carr page on CPY: https://archive.org/details/6502UsersManual/page/n269
- Leventhal page on CPY: https://archive.org/details/6502-assembly-language-programming/page/n108
- snes9x implementation of CPY: https://github.com/snes9xgit/snes9x/blob/master/cpuops.cpp#L442
- undisbeliever on CPY: https://undisbeliever.net/snesdev/65816-opcodes.html#cpy-compare-index-register-y-with-memory