TYA: Difference between revisions

Revision as of 04:15, 6 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

@@ Line 60: / Line 60: @@
 * [[Eyes & Lichty]] page 520, on TYA: https://archive.org/details/0893037893ProgrammingThe65816/page/n546
 * [[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 101 on TYA: https://archive.org/details/mos_microcomputers_programming_manual/page/n119
 * [[Carr]] page 275 on TYA: https://archive.org/details/6502UsersManual/page/n288
 * [[Leventhal]] page 3-104 on TYA: https://archive.org/details/6502-assembly-language-programming/page/n153