W742C814 查看數據表（PDF） - Winbond

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W742C814

4-BIT MICROCONTROLLER

Winbond 

W742C814

4. PIN DESCRIPTION

SYMBOL

XIN

XOUT

VF

VXXF

RA0 − RA3

RB0 − RB3

RC0 − RC3

RD0 − RD3

RE0 − RE3

MFP

DTMF

I/O

FUNCTION

I Input pin for 32.768 Hz oscillator. Connected to 32.768 KHz crystal only.

O Output pin for 32.768 Hz oscillator. Connected to 32.768 KHz crystal only.

I Low pass filter for PLL circuit. Connected capacitor to VSS.

I Regulator for PLL circuit. Connected capacitor (10 µF) to VSS.

I/O

Input/Output port.

Input/output mode specified by port mode 1 register (PM1).

I/O

Input/Output port.

Input/output mode specified by port mode 2 register (PM2).

4-bit port for input only.

I

Each pin has an independent interrupt capability.

I/O

Input/Output port.

Input/output mode specified by port mode 5 register (PM5).

O Output port only. With high sink current capacity for the LED application.

Output pin only.

O

This pin can output modulating or nonmodulating frequency, or Timer 1

specified frequency. It can be selected by bit 0 of BUZCR (BUZCR.0).

O This pin can output dual-tone multifrequency signal for dialling.

RES

SEG0 − SEG31

COM0 − COM3

DH1, DH2

VDD1

VDD2

TEST1, TEST2

VDD

VSS

I System reset pin.

O LCD segment output pins.

LCD common signal output pins.

O

The LCD alternating frequency can be selected by code option.

I Connection terminals for voltage doubler (halver) capacitor.

Positive (+) supply voltage terminal.

I

Refer to Functional Description.

I For IC testing used, User don’t care these pin.

I Positive power supply (+).

I NEGATIVE POWER SUPPLY (-).

Publication Release Date: February 12, 2003

-5-

Revision A2

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