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TYA: Difference between revisions

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=== External Links ===
=== External Links ===
* [[Eyes & Lichty]] page 520, on TYA: https://archive.org/details/0893037893ProgrammingThe65816/page/n546
* [[Eyes & Lichty]] page 520, on TYA: https://archive.org/details/0893037893ProgrammingThe65816/page/n546
* [[Labiak]] page on TYA: https://archive.org/details/Programming_the_65816/page/n211
* [[Labiak]] page 201 on TYA: https://archive.org/details/Programming_the_65816/page/n211
* [[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

Revision as of 01:34, 28 November 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