Panasonic FP7 Series Command Reference Manual page 741

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Flag operations
Name
SR7
SR8
(ER)
WUME-FP7CPUPGR-12
Description
To be set in the case of out-of-range in indirect access (index modification).
To be set when the number of characters [S1] is larger than [S2].
To be set when the string range specified by [S1] or [S2] is out of the accessible range.
14.20 SSRC (String Search)
14-91