UPD750006GBA データシートの表示（PDF） - NEC => Renesas Technology

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UPD750006GBA

4 BIT SINGLE-CHIP MICROCONTROLLER

NEC => Renesas Technology 

µPD750004, 750006, 750008, 750004(A), 750006(A), 750008(A)

6.3 CONTROL FUNCTIONS OF SUBSYSTEM CLOCK OSCILLATOR

The subsystem clock oscillator of the µPD750008 subseries has two control functions to decrease the supply

current.

• The function to select with the software whether to use the built-in feedback resistorNote

• The function to suppress the supply current by reducing the drive current of the built-in inverter when the supply

voltage is high (VDD ≥ 2.7 V)

Note When the subsystem clock is not used, set SOS.0 to 1 (not to use the built-in feedback resistor), connect

XT1 to VSS, and open XT2. This makes it possible to reduce the supply current required by the subsystem

clock oscillator.

Each function can be used by switching bits 0 and 1 in the sub-oscillator control register (SOS). (See Fig. 6-2.)

Fig. 6-2 Subsystem Clock Oscillator

SOS.0 VDD

Feedback resistor

Inverter

XT1

XT2

SOS.1

23

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