UPD750064A データシートの表示（PDF） - NEC => Renesas Technology

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UPD750064A

4 BIT SINGLE CHIP CMOS MICROCOMPUTERS

NEC => Renesas Technology 

µPD750064, 750066, 750068, 750064(A), 750066(A), 750068(A)

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

SOS.0

Feedback resistor

Inverter

XT1

XT2

SOS.1

Data Sheet U10165EJ2V0DS00

25

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