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TYA: Difference between revisions

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* [[MCS6500 Manual]] page on TYA: https://archive.org/details/mos_microcomputers_programming_manual/page/n119
* [[MCS6500 Manual]] page on TYA: https://archive.org/details/mos_microcomputers_programming_manual/page/n119
* [[Carr]] page on TYA: https://archive.org/details/6502UsersManual/page/n288
* [[Carr]] page on TYA: https://archive.org/details/6502UsersManual/page/n288
* [[Leventhal]] page on TYA: https://archive.org/details/6502-assembly-language-programming/page/n153
* [[Leventhal]] page 3-104 on TYA: https://archive.org/details/6502-assembly-language-programming/page/n153
* snes9x implementation of TYA: https://github.com/snes9xgit/snes9x/blob/master/cpuops.cpp#L2455
* snes9x implementation of TYA: https://github.com/snes9xgit/snes9x/blob/master/cpuops.cpp#L2455



Revision as of 00:16, 5 December 2023

Basic Info
Addressing Mode Opcode Length Speed
Implied (type 1) 98 1 byte 2 cycles
Flags Affected
N V M X D I Z C
. . . . . .

TYA is a 65x instruction that transfers the value of the Y index register to the accumulator.

Instruction Behavior
8-bit accumulator (m=1) 16-bit accumulator (m=0)
8-bit index registers (x=1) 8 bits are transferred 8 bits are transferred to the low byte of accumulator and high byte of the accumulator is zeroed
16-bit index registers (x=0) 8 bits (the low byte of the index register) are transferred and the hidden byte of the B accumulator is unaffected 16 bits are transferred

See Also

External Links