UPD17015 datasheet(12/120 Pages) NEC

12 / 120 page

µPD17015

1.3

HANDLING UNUSED PINS

When connecting unused pins, the following conditions and handling are recommended:

Table 1-1 Handling Unused Pins

I/O type

Recommended handling when unused

Port pin

P0B0-P0B2

Input

Connect each pin to ground through a resistorNote 1.

P0C0-P0C3

CMOS push-pull output

Leave open.

P0D0/BEEP

P0A2, P0A3

P0A0, P0A1

I/ONote 2

Set these pins to input mode by software. Then,

connect each pin to VDD or ground through a

resistorNote 1.

Non-port

CAP0, CAP1

—

Leave open.

Input

Connect to VDD through a resistorNote 1.

COM0-COM3

Output

Leave open.

Output

Leave open.

LCD0-LCD8

Output

Leave open.

VCOH, VCOL

Input

Set these pins to the disabled state by software.

Then, leave these pins open.

VLCD0, VLCD1

—

Leave open.

VREG

—

Leave open.

Notes 1. When a pin is pulled up (connected to VDD through a resistor) or pulled down (connected to ground

through a resistor) outside the chip, caution is required. When using high-resistance pull-up or pull-down

resistors, the pin approaches high-impedance and the consumption (through) current increases.

Although the optimum pull-up or pull-down resistor varies with the application circuit, in general the use

of a resistor of 10 to 100 kilohms is recommended.

2. I/O port is applicable at power-on, at clock stop, at CE reset, or in input mode.

UPD17015 Datasheet(PDF) 12 Page - NEC

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