Panasonic MN101C00 - Manual (Page 151)

Chapter 8 Appendices
137
EPROM Versions
8-1-7 Option Bit
The MN101C117 and the MN101CP117 control the oscillation mode after resetting
as well as the runaway-detection watch dog timer, using bit 2 to 0 of the last address
(X'7FFF) of the built-in ROM.
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Option bit
Fig. 8-1-2 Option bit(Address: X'07FFF')