UPD64AMC datasheet(6/64 Pages) NEC

6 / 64 page

µPD64A, 65

Data Sheet U14380EJ2V0DS00

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

——

—

Input

(high-impedance,

STOP mode

release cannot be

used)

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

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 a key scan output

from key matrix.

Refers to the input port.

Can also be used as a key return input from 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 a key

return input from 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), this pin 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.

Refers to the input port.

The use of the STOP mode release of the S2 port can be

specified by software. When using this pin as a key input

from a key matrix, enable the use of the STOP mode

release (at this time, a pull-down resistor is connected

internally.)

When the STOP mode release is disabled, this pin can

be used as the input port which does not release the

STOP mode even if the release condition is established

(at this time, a pull-down resistor is not connected internally.)

These pins refer to the 4-bit input ports.

They can be used as a key return input from key matrix.

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

software in 4-bit units.

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