TXA

Transfer X Index to Accumulator

Opcode: TXA Operation: X → A Status Register:

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

Operation

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

unsigned src = X;             // Load the value of the X index 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.
A = (src);                    // Stores the value of the X index into the accumulator.

Addressing Modes

Addressing Mode	Assembly Language Form	Opcode	# Bytes	# Cycles
Implied	TXA	8A	1	2