6

µPD6P4B

Data Sheet U13594EJ2V1DS00

1. PIN FUNCTIONS

1.1 Normal Operating Mode

Pin No.

Symbol

Function

Output Format

When Reset

1KI/O0-KI/O7

CMOS

High-level output

2

push-pullNote 1

15-20

3S0

—

High-impedance

(OFF mode)

4S1/LED

CMOS push-pull

High-level output

(LED)

5

REM

CMOS push-pull

Low-level output

6VDD

——

7XOUT

—

Low level

8XIN

(oscillation stopped)

9

GND

——

10

RESET

——

11-14

KI0-KI3Note 2

—

Input (low-level)

Notes 1. Be careful about this because the drive capability of the low-level output side is held low.

2. 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 reset is released (when RESET pin changes from low level to high level, or POC is

released due to supply voltage startup).

These pins refer to the 8-bit I/O ports. I/O switching can

be made in 8-bit units.

In INPUT mode, a pull-down resistor is added.

In OUTPUT mode, they can be used as the key scan

output of the key matrix.

Refers to the input port.

Can also be used as the key return input of the key

matrix.

In INPUT mode, the availability of the pull-down resistor

of the S0 and S1 ports can be specified by software in

terms in 2-bit units.

If INPUT mode is canceled by software, this pin is placed

in OFF mode and enters the high-impedance state.

Refers to the I/O port.

In INPUT mode (S1), this pin can also be used as the key

return input of the key matrix.

The availability of the pull-down resistor of the S0 and S1

ports can be specified by software in 2-bit units.

In OUTPUT mode (LED), it becomes the remote control

transmission display output (active low).

When the

remote control carrier is output from the REM output, this

pin outputs the low level from the LED output synchronously

with the REM signal.

Refers to the infrared remote control transmission output.

The output is active high.

Carrier frequency: fX/8, fX/64, fX/96, high-level,

fX/16, fX/128, fX/192 (usableonsoftware)

Refers to the power supply.

These pins are connected to system clock ceramic

resonators.

Refers to the ground.

Normally, this pin is a system reset input. By inputting

a low level, the CPU can be reset. When resetting with

the POC circuit a low level is output. A pull-up resistor

is incorporated.

These pins refer to the 4-bit input ports.

They can be used as the key return input of the key

matrix.

The use of the pull-down resistor can be specified by

software in 4-bit units.