8

µPD66P04B

Data Sheet U13596EJ2V0DS00

1.4 Dealing with 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

INPUT mode

—

Open

OUTPUT mode

High-level output

REM

—

OUTPUT mode (LED) setting

OFF mode setting

Directly connected to GND

—

Built-in POC circuit

Open

Note If the circuit is an applied one requiring high reliability, be sure to design it in such a manner that the RESET

signal is entered externally.

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

repeatedly in each loop of the program.

released (when RESET pin changes from low level to high level, or POC is released due to supply voltage startup).