GMS34004 데이터 시트보기 (PDF) - Hyundai Micro Electronics

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GMS34004

4-BIT SINGLE CHIP MICROCOMPUTERS

Hyundai Micro Electronics 

Chapter 1. Introduction

I/O circuit types and options

GMS340 series I/O port types

Pin

VDD

GND

RESET

K0~K3

D0~D9

R0~R3

REMOUT

OSC1

OSC2

I/O

-

-

Input

Input

Output

I/O

Output

Input

Output

Function

Connected to 2.0~4.0V power supply.

Connected to 0V power supply.

Used to input a manual reset. When the pin goes ¡ÈL¡È, the

D-output ports and REMOUT-output port are initialized to

¡ÈL¡È, and ROM address is set to address 0 on page 0.

4-bit input port.

Released STOP mode built in pull-up resistor by each pin as

masked option.

(It is released by ¡ÈL¡È input at STOP)

Each can be set and reset independently. The output is in

the form of N-channel-open-drain.

4-bit I/O port. (Input mode is set only when each of them

output ¡ÈH¡È.)

In outputting, each can be set and reset independently(or at

once.)

The output is in the form of N-channel-open-drain.

Pull-up resistor and STOP release mode can be respectively

selected as masked option for each bit. (It is released by

¡ÈL¡È input at STOP.)

High current output port.

The output is in the form of C-MOS.

The state of large current on is ¡ÈH¡È.

Oscillator input. Input to the oscillator circuit and connection

point for ceramic resonator.

Internal capacitors available as masked option.

A feedback resistor is connected between this pin and OSC2

Connect a ceramic resonator between this pin and OSC1.

1- 7

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