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TYA: Difference between revisions

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=== See Also ===
=== See Also ===
* [[TXA]]
* [[TXA]]
* [[TAY]]


=== External Links ===
=== External Links ===

Revision as of 21:25, 16 July 2023

Basic Info
Addressing Mode Opcode Length Speed
implied 98 1 byte 2 cycles
Flags Clobbered
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