Panasonic FP7 Series Command Reference Manual page 456

10.2 BCU (ON Bits Count)
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Processing
Example 1) Operation units: 16 bits (US)
Example 2) Operation units: 32 bits (UL) (specify a 16-bit device for [S])
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Flag operations
Name
SR7
SR8
(ER)
10-6
Description
To be set in the case of out-of-range in indirect access (index modification).
WUME-FP7CPUPGR-12