UPD17708 datasheet(22/356 Pages) NEC

22 / 356 page

µPD17704, 17705, 17707, 17708, 17709

Table 1-1. Connections of Unused Pins (2/2)

Pin Name

I/O Mode

Recommended Connections of Unused Pins

Port pin

P3A3-P3A0

I/ONote 2

Set in general-purpose input port mode by software and

P3B3-P3B0

individually connect to VDD or GND via resistorNote 1.

P3C3-P3C0

P3D3-P3D0

Pins other

Input

Connect to VDD via resistorNote 1.

than port

EO1

Output

Open

pins

EO0

INT0-INT2

Input

Individually connect to GND via resistorNote 1.

RESET

Input

Connect to VDD via resistorNote 1.

TEST

–

Directly connect to GND.

VCOH

Input

Disable PLL via software and open.

VCOL

Notes 1. If a pin is externally pulled up (connected to VDD via resistor) or pulled down (connected to GND

via resistor) with a high resistance, the pin almost enters a high-impedance state, increasing the

current (through-current) consumption of the port. Generally, the resistance of a pull-up or pull-

down resistor is several 10 k

Ω, though it depends on the application circuit.

2. The I/O ports are set in the general-purpose input port mode at power-ON reset, when reset by

the RESET pin, or when reset due to overflow or underflow of the watchdog timer or the stack.

UPD17708 데이터시트(PDF) 22 Page - NEC

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