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DEY: Difference between revisions
From SnesLab
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'''DEY''' is a 65x instruction that decrements the [[Y index register]] by one. | '''DEY''' is a 65x instruction that decrements the [[Y index register]] by one. DEY ignores the [[decimal flag]]. | ||
=== See Also === | === See Also === | ||
Revision as of 22:18, 27 June 2024
| Basic Info | |||||||
|---|---|---|---|---|---|---|---|
| Addressing Mode | Opcode | Length | Speed | ||||
| Implied (type 1) | 88 | 1 byte | 2 cycles | ||||
| Flags Affected | |||||||
|---|---|---|---|---|---|---|---|
| N | V | M | X | D | I | Z | C |
| . | . | . | . | . | . | ||
DEY is a 65x instruction that decrements the Y index register by one. DEY ignores the decimal flag.
See Also
External Links
- Eyes & Lichty page 453, on DEY: https://archive.org/details/0893037893ProgrammingThe65816/page/n479
- Labiak page 140 on DEY: https://archive.org/details/Programming_the_65816/page/n150
- MCS6500 Manual page 98 on DEY: https://archive.org/details/mos_microcomputers_programming_manual/page/n116
- Carr page 258 on DEY: https://archive.org/details/6502UsersManual/page/n271
- Leventhal page 3-62 on DEY: https://archive.org/details/6502-assembly-language-programming/page/n111
- snes9x implementation of DEY: https://github.com/snes9xgit/snes9x/blob/master/cpuops.cpp#L1514