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CPY: Difference between revisions
From SnesLab
(clobbered -> affected) |
(linkify absolute and immediate) |
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| Line 7: | Line 7: | ||
|'''Speed''' | |'''Speed''' | ||
|+ | |+ | ||
| | |[[Immediate]] | ||
|C0 | |C0 | ||
|2 bytes | |2 bytes | ||
|2 cycles | |2 cycles | ||
|+ | |+ | ||
| | |[[Absolute]] | ||
|CC | |CC | ||
|3 bytes | |3 bytes | ||
Revision as of 04:15, 20 November 2023
| 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