TAX

Transfer Accumulator to X Index

Opcode: TAX Operation: A → X Status Register:

TAX (Transfer Accumulator to X Index) transfers the value in the accumulator to the X index. The reverse of this opcode is TXA.

Operation

This pseudo C code shows how the TAX opcode functions when it is executed.

unsigned src = A;             // Load the value of the accumulator as an unsigned byte.
SET_NEGATIVE(src);            // Sets the Negative Flag equal to the 7th bit.
SET_ZERO(src);                // Sets the Zero Flag if the Operand is $#00, otherwise clears it.
X = (src);                    // Stores the value of the Accumulator into the X index.

Addressing Modes

Addressing Mode	Assembly Language Form	Opcode	# Bytes	# Cycles
Implied	TAX	AA	1	2