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UPD750064CU Datasheet(PDF) 25 Page - NEC |
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UPD750064CU Datasheet(HTML) 25 Page - NEC |
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25 / 82 page  25 µPD750064, 750066, 750068, 750064(A), 750066(A), 750068(A) Data Sheet U10165EJ2V0DS00 6.3 Subsystem Clock Oscillator Control Function The subsystem clock oscillator of the µPD750068 has the following two control functions to decrease the supply current. • Selects by software whether an internal feedback resistor is to be used or notNote. • Reduces current consumption by decreasing the drive current of the on-chip inverter when the supply voltage is high (VDD ≥ 2.7 V). Note When the subsystem clock is not used, set SOS.0 to 1 (so as not to use the internal feedback resistor) by software, connect XT1 to VSS, and open XT2. This makes it possible to reduce the current consumption in the subsystem clock oscillator. The above functions can be used by switching the bits 0 and 1 of the sub-oscillator control register (SOS). (Refer to Figure 6-2.) Figure 6-2. Subsystem Clock Oscillator Feedback resistor SOS.0 SOS.1 XT1 XT2 Inverter |
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