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DEY: Difference between revisions
From SnesLab
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{| class="wikitable" style="float:right;clear:right;width: | |||
!colspan="8"|Basic Info | !colspan="8"|Basic Info | ||
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|'''Speed''' | |'''Speed''' | ||
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| | |[[Implied]] (type 1) | ||
|88 | |88 | ||
|1 byte | |1 byte | ||
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{| class="wikitable" style="float:right;clear:right;width:30%" | {| class="wikitable" style="float:right;clear:right;width:30%" | ||
!colspan="8"|Flags | !colspan="8"|Flags Affected | ||
|+ | |+ | ||
|N | |[[N Flag|N]] | ||
|V | |[[V Flag|V]] | ||
|M | |[[M Flag|M]] | ||
|X | |[[X Flag|X]] | ||
|D | |[[D Flag|D]] | ||
|I | |[[I Flag|I]] | ||
|Z | |[[Z Flag|Z]] | ||
|C | |[[C Flag|C]] | ||
|+ | |+ | ||
| | | | ||
|. | |||
|. | |||
|. | |||
|. | |||
|. | |||
| | | | ||
| | |. | ||
|} | |} | ||
'''DEY''' is a 65x instruction that decrements the [[Y index register]] by one. | |||
=== See Also === | === See Also === | ||
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* [[INX]] | * [[INX]] | ||
* [[INY]] | * [[INY]] | ||
=== 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 | |||
[[Category:ASM]] | [[Category:ASM]] | ||
[[Category:Inherited from 6502]] | [[Category:Inherited from 6502]] | ||
[[Category:One-byte Instructions]] | |||
[[Category:Implied Instructions]] | |||
[[Category:Two-cycle Instructions]] |
Latest revision as of 11:40, 14 December 2023
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.
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