1989_MELPS_7700_Software_Manual

STX
Store Index Register X in Memory
STX
Operation
When x=O,
M(n) ~ XL
M(n+1) ~ XH
When x=1
M(n) ~ XL
Description
Stores the contents of the index register X in memory. The contents of the index
register X remain the same.
Status flags
Not affected.
Addressing mode Syntax Machine code Bytes Cycles
Direct STX dd 8616, dd 2 4
Direct indexed Y . STX dd, Y 9616, dd 2 5
Absolute STX mmll 8E16, II, mm 3 5
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