Panasonic FP7 Series Command Reference Manual page 293

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Flag operations
Name
SR7
SR8
(ER)
WUME-FP7CPUPGR-12
5.15 BSWAP (High /Low Byte in n Block Exchange)
Description
To be set in the case of out-of-range in indirect access (index modification).
To be set when the transfer range is outside the accessible range.
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