Relays, Memory Areas and Constants
1-60
Cautions when using index registers
An index register can not be modified with an index register.
IXIX, IXIY
If the result of address modification overflows the memory area, an operation error will
result.
When the address resulting from modification is negative or a large number.
When modifying 32−bit constants, IX is specified. At this point, IX and IY in combination
are handled as 32−bit data.
Lower 16−bit areaHigher 16−bit area
Contents of IXContents of IY
The results of modification will be 32−bit data.
Note
For detailed information about the procedures for using index
registers
section 4.5
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