UPD64 datasheet(6/68 Pages) NEC

6 / 68 page

µPD63, 63A, 64

1. PIN FUNCTIONS

1.1 List of Pin Functions

Pin No.

Symbol

Function

Output Format

When Reset

1KI/O0-KI/O7

CMOS

High-level output

push-pullNote 1

15-20

3S0

—

High-impedance

(OFF mode)

4S1/LED

CMOS push-pull

High-level output

(LED)

REM

CMOS push-pull

Low-level output

6VDD

——

7XOUT

—

Low level

8XIN

(oscillation stopped)

GND

——

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, be sure to input a low level to more than one of pins KI0 to KI3 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 (usable on software)

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 (mask option) 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.

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