TXA: Difference between revisions

Revision as of 04:53, 18 June 2023

TXA is a 65x instruction that transfers the value of the X index register to the accumulator.


Basic Info
Addressing Mode	Opcode	Length	Speed
implied	8A	1 byte	2 cycles


Flags Clobbered
N	V	M	X	D	I	Z	C
	.	.	.	.	.		.


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 (low byte of accumulator) and high byte of accumulator is zeroed
16-bit index registers (x=0)	8 bits are transferred	16 bits are transferred

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+{| class="wikitable" style="float:right;clear:right;width:40%"
+!colspan="3"|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 (low byte of accumulator) and high byte of accumulator is zeroed
+|+
+|'''16-bit index registers (x=0)'''
+|8 bits are transferred
+|16 bits are transferred
 |}