NEC PD750008 - Manual (Page 256)

236
µPD750008 USER'S MANUAL
10.3 MASK OPTION FOR FEEDBACK RESISTOR OF SUBSYSTEM CLOCK
For the subsystem clock of the µPD750008, whether to enable the feedback resistor is selected by the mask
option.
<1> Enable the feedback resistor (switches on or off by software).
<2> Disable the feedback resistor (cuts by hardware).
To use the feedback resistor after selecting <1>, turn the feedback resistor on by setting SOS.0 to 0 (for
details, see (6) in Section 5.2.2).
Select <1> to use the subsystem clock.
For the µPD75P0016, the mask option need not be set; use of the feedback resistor is factory-set.