UPD750064CU datasheet(25/82 Pages) NEC

tên linh kiện	UPD750064CU

Giải thích chi tiết về linh kiện	4-BIT SINGLE-CHIP MICROCONTROLLERS

PDF	82 Pages

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nhà sản xuất	NEC [NEC]

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25 / 82 page

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

UPD750064CU bảng dữ liệu(PDF) 25 Page - NEC