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LDY: Difference between revisions

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* [[Eyes & Lichty]] page 464, on LDY: https://archive.org/details/0893037893ProgrammingThe65816/page/n490
* [[Eyes & Lichty]] page 464, on LDY: https://archive.org/details/0893037893ProgrammingThe65816/page/n490
* [[Labiak]] page 151 on LDY: https://archive.org/details/Programming_the_65816/page/n161
* [[Labiak]] page 151 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
* [[MCS6500 Manual]] page 96 on LDY: https://archive.org/details/mos_microcomputers_programming_manual/page/n114
* [[Carr]] page 264 on LDY: https://archive.org/details/6502UsersManual/page/n277
* [[Carr]] page 264 on LDY: https://archive.org/details/6502UsersManual/page/n277
* [[Leventhal]] page 3-74 on LDY: https://archive.org/details/6502-assembly-language-programming/page/n123
* [[Leventhal]] page 3-74 on LDY: https://archive.org/details/6502-assembly-language-programming/page/n123

Revision as of 04:22, 6 December 2023

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 Affected
N V M X D I Z C
. . . . . .

LDY (Load Y) is a 65x instruction that loads the Y index register. In immediate addressing only, LDY takes a total of 3 bytes when the index registers are 16 bits wide.

Cycle Penalties

See Also

External Links