UPD750108CU(A) データシートの表示（PDF） - NEC => Renesas Technology

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UPD750108CU(A)

4 BIT SINGLE-CHIP MICROCONTROLLER

NEC => Renesas Technology 

µPD750104, 750106, 750108, 750104(A), 750106(A), 750108(A)

6.3 Control Functions of Subsystem Clock Oscillator

The subsystem clock oscillator of the µPD750108 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 or VDD, 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 Figure 6-

2.)

Figure 6-2. Subsystem Clock Oscillator

SOS.0

Feedback resistor

Inverter

XT1

XT2

SOS.1

23

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