TYA: Difference between revisions

Revision as of 12:08, 6 August 2024


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
N	.	.	.	.	.	Z	.

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

TYA

@@ Line 65: / Line 65: @@
 === External Links ===
-* [[Eyes & Lichty]] page 520, on TYA: https://archive.org/details/0893037893ProgrammingThe65816/page/520
+* [[Eyes & Lichty]], [https://archive.org/details/0893037893ProgrammingThe65816/page/520 page 520] on TYA
 * [[Labiak]] page 201 on TYA: https://archive.org/details/Programming_the_65816/page/n211
 * [[MCS6500 Manual]] page 101 on TYA: https://archive.org/details/mos_microcomputers_programming_manual/page/n119