Panasonic FP-E Programming Manual page 318

High−level Instructions
Description
The higher order byte (higher 8-bit) and lower order byte (lower 8-bit) of the 16-bit area specified by D are
exchanged.
Flag conditions
・Error flag (R9007):
・Error flag (R9008):
3 − 54
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Turns on and stays on when the area specified using the index modifier
exceeds the limit.
Turns on for an instant when the area specified using the index modifier
exceeds the limit.