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LDY: Difference between revisions
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* [[Leventhal]] page on LDY: https://archive.org/details/6502-assembly-language-programming/page/n123 | * [[Leventhal]] page on LDY: https://archive.org/details/6502-assembly-language-programming/page/n123 | ||
* snes9x implementation of LDY: https://github.com/snes9xgit/snes9x/blob/master/cpuops.cpp#L817 | * snes9x implementation of LDY: https://github.com/snes9xgit/snes9x/blob/master/cpuops.cpp#L817 | ||
* undisbeliever on LDY: https://undisbeliever.net/snesdev/65816-opcodes.html#ldy-load-index-register-y-from-memory | |||
[[Category:ASM]] | [[Category:ASM]] | ||
[[Category:Group Three Instructions]] | [[Category:Group Three Instructions]] | ||
[[Category:Inherited from 6502]] | [[Category:Inherited from 6502]] | ||
Revision as of 04:06, 18 May 2023
LDY (Load Y) is a 65x instruction that loads the Y index register.
| Basic Info | |||||||
|---|---|---|---|---|---|---|---|
| Addressing Mode | Opcode | Length | Speed | ||||
| immediate | A0 | 2 bytes | 2 cycles | ||||
| absolute | AC | 3 bytes | 4 cycles | ||||
| direct page | A4 | 2 bytes | 3 cycles | ||||
| absolute indexed X | BC | 3 bytes | 4 cycles | ||||
| direct page indexed X | B4 | 2 bytes | 4 cycles | ||||
| Flags Clobbered | ||||||||
|---|---|---|---|---|---|---|---|---|
| N | V | M | X | D | I | Z | C | |
| . | . | . | . | . | . | |||
See Also
External Links
- Eyes & Lichty page on LDY: https://archive.org/details/0893037893ProgrammingThe65816/page/n489
- Labiak page on LDY: https://archive.org/details/Programming_the_65816/page/n161
- MCS6500 Manual page on LDY: https://archive.org/details/mos_microcomputers_programming_manual/page/n114
- Carr page on LDY: https://archive.org/details/6502UsersManual/page/n277
- Leventhal page on LDY: https://archive.org/details/6502-assembly-language-programming/page/n123
- snes9x implementation of LDY: https://github.com/snes9xgit/snes9x/blob/master/cpuops.cpp#L817
- undisbeliever on LDY: https://undisbeliever.net/snesdev/65816-opcodes.html#ldy-load-index-register-y-from-memory