1989_MELPS_7700_Software_Manual

TAX
Transfer Accumulator A to Index Register X
TAX
Operation
If X=O,
XL f- AL
XH f- AH
If x=1,
XL f- AL
Description
Loads the index register X with the contents of the accumulator A. The contents
of the accumulator A.are not changed.
Status flags
IPL :
N
V
m
x
D
Not affected.
Set to 1 when bit 15 (or bit 7 if the index register length selection flag x is set
to 1) of the operation result is 1. Otherwise, cleared to O.
Not affected.
Not affected.
Not affected.
Not affected.
Not affected.
Z Set to 1 when the result of operation is O. Otherwise, cleared to O.
C
Not affected.
Addressing mode I Syntax Machine code Bytes Cycles
Implied I TAX AA16 1 2
145