MTU420 Ver la hoja de datos (PDF) - Unspecified

Número de pieza

componentes Descripción

Fabricante

MTU420

4-Bit Micro-Controller with LCD Driver, 2K Word

Unspecified 

MYSON

TECHNOLOGY

MTU420

3.0 PIN DESCRIPTIONS

Name

XTIN

XTOUT

CFIN

CFOUT

S1 - 4

M1 - 4

IOA1-4

IOB1-4

P1 - 4

INT

VDD

LIGHT

ALM

RES

GND

VDD3

VDD2

VDD1

Type

I

O

I

O

I

I

I/O

I/O

O

I

O

O

I

Description

- Time-based counter frequency (clock specified, LCD alternating frequency,

alarm signal frequency) or system clock oscillation.

- 32KHz crystal oscillator.

- Oscillation stops at the execution of stop instruction.

- System clock oscillation.

- Connected with ceramic resonator or crystal oscillator.

- Connected with RC oscillation circuit.

- Oscillation stops at the execution of stop or SLOW instruction.

- Input port.

- Input pins for data storage into RAM area (with chattering prevention).

- Internal chattering prevention circuit (32ms, 8ms, 2ms selectable by

application program).

- Internal pull-down resistor (selectable by application program).

- Internal "L"-level logic holds Tr (selectable by mask option).

Note: The chattering prevention circuit parameters, 32ms, 8ms and 2ms, apply

to the 32.768KHz fundamental frequency input mode.

- Input port.

- Input pins for data storage into RAM area.

- Internal chattering prevention circuit (32ms, 8ms, 2ms selectable by

application program).

- Internal pull-down resistor (selectable by application program).

- Internal "L"-level logic holds Tr (selectable by mask option).

Note: The chattering prevention circuit parameters, 32ms, 8ms and 2ms, apply

to the 32.768KHz fundamental frequency input mode.

- Input/ Output port.

- Input pins for data storage into the RAM area.

- Output pin for data reading from the RAM area.

- Input/ Output port.

- Input pins for data storage into the RAM area.

- Output pin for data reading from the RAM area.

- Output port.

- Output pin for data output from the RAM area.

- Input port.

- Input pin for external request signal.

- Interrupt detection signal edge selection by mask option: falling edge and

rising edge.

- Internal pull-down and pull-up resistor (selectable by mask option).

- Positive supply voltage.

Note: When using Li version, a capacitor must be connected across GND and

VDD to prevent the logic unit from malfunctioning.

- Output port.

- Output port.

- Output alarm signal: modulated signals with a frequency of 4kHz, 2kHz or

1kHz. In this case, these modulated frequencies are generated and then

outputted if the fundamental frequency is 32.768kHz.

- Input pin from LSI reset request signal.

- Internal pull-down resistor.

- Negative supply voltage.

- LCD drive voltage.

MTU420 Revision 2.9 02/17/1998

4/11

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