1989_MELPS_7700_Software_Manual

TXA
Transfer Index Register X to Accumulator A
TXA
Operation
If m=O and x=O,
If m=O and x=1,
If m=1,
AL ~ XL
AL ~ XL
AL ~ XL
AH ~ XH
AH ~ 0016
Description
Loads the accumulator A with the contents of the index register X. The contents
of the index register X are not changed.
Status flags
IPL:
N
v
m
x
D
I
Z
C
Not affected.
Set to 1 when bit 15 (or bit 7 if the data length selection flag m is set to 1) of
the operation result is 1. Otherwise, cleared to O.
Not affected.
Not affected:
Not affected.
Not affected.
Not affected.
Set to 1 when the result of operation is O. Otherwise, cleared to O.
Not affected.
Addressing mode Syntax Machine code Bytes Cycles
Implied TXA 8A16 1 2
156