UPD62AMC datasheet(6/62 Pages) NEC

6 / 62 page

µPD62A

Data Sheet U14474EJ1V0DS00

1. PIN FUNCTIONS

1.1 List of Pin Functions

Pin No.

Symbol

Function

After Format

After Reset

KI/O0 to KI/O7

CMOS

High-level output

push-pullNote 1

15 to 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 to 14

KI0 to KI3Note 2

—

Input (low-level)

Notes 1. Be aware that 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 the RESET pin changes from low level to high level, or POC is released due

to supply voltage startup).

8-bit input/output port

Input/output can be specified in 8-bit units.

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

In output mode, these pins can be used as the key scan

output of the key matrix.

Input port

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

matrix.

In input mode, the use of a pull-down resistor for the S0

and S1 ports can be specified by software in 2-bit units.

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

in OFF mode and enters the high-impedance state.

Input/output port

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

return input of the key matrix.

The use of a pull-down resistor for the S0 and S1 ports

can

specified

software

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 a low level from the LED output synchronously

with the REM signal.

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 (software supporting)

Power supply

These pins are connected to system clock ceramic

resonators.

Ground

Normally, this pin is the 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 connected to this pin.

4-bit input port

These pins can be used as the key return input of the key

matrix.

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

software in 4-bit units.

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