9

µPD6P9

Data Sheet U15144EJ1V1DS

1.4 Recommended Connection of Unused Pins

The following connections are recommended for unused pins in the normal operation mode.

Table 1-1. Connections for Unused Pins

Pin

Connection

Inside the Microcontroller

Outside the Microcontroller

KI/O

Input mode

—

Leave open

Output mode

High-level output

REM

—

S1/LED

Output mode (LED) setting

S0

OFF mode setting

Directly connect these pins

S2

—

to GND

KI

—

Caution The I/O mode and the pin output level are recommended to be fixed by setting them repeatedly

in each loop of the program.

1.5 Notes on Using KI Pin After Reset

In order to prevent malfunction, do not input a high-level signal to pins KI0 to KI3 (leaving these pins open is

possible, however, when these pins are left open, do not disconnect any connected pull-down resistors) when POC

is released due to supply voltage startup.