NULL MODEM WITH LOOP BACK HANDSHAKING

NULL MODEM WITH LOOP BACK HANDSHAKING

A null modem cable for you...try to understand its working...if not i will tell you..start coment

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TURNING ON AND OFF LED BY USING TIMER 0/1 AND MAKE THE USE OF DIFFERENT MODES OF TIMER

TURNING ON AND OFF LED BY USING TIMER 0/1 AND MAKE THE USE OF DIFFERENT MODES OF TIMER

In this practical we use timer 0 to create a square wave on P1.0 by connecting an LED through resistor also show the waveform on Oscilloscope.

Steps:

First of all make your microcontroller active by connecting the crystal from pin number 18 and 19(see in figure 2) 
Set the reset button from pin 9 as shown in figure 3.
Make the controller in working order as show in figure 4, then connect an LED through resistor to pin of port 1.0

Write a program of ON and OFF LED by using timer 0/1 in assembly language.

Burn the assembly language program in microcontroller through universal programmer.

You can see th wave form on oscilloscope.

Circuit Diagram:

pic configuration of ATML 89S52

Attachment of crystall figure number 2

Reset button figure no.3

Working condition of microcontroller figure 4

LED connection

Assembly Language Program :

ORG 00H

MOV P1,#0FFH

MAIN:MOV TMOD,#01H

MOV TH0,#00H

MOV TL0,#00H

SETB TR0

LOOP: JNB TF0,LOOP

CPL P1.0

CLR TR0

CLR TF0

JMP MAIN

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LED Interfacing with 8051 Microcontroller

 

LED interfacing is the main thing, one would attempt to do while beginning with any microcontroller. So here in this instructional exercise we are going to interface a LED with 8051 microcontroller, and will compose a C Program to flicker the LED. We have utilized an extremely prevalent microcontroller AT89S52, of 8051 family, by ATMEL. 

Before really expounding, we ought to get some short thought regarding microcontroller AT89S52. It is 40 pin microcontroller, and has 4 ports (P0,P1,P2,P3), every port have 8 pins. We can consider every port as 8 bit register, from the product perspective. Every pin having one Input/yield line, implies each pin can be utilized for contribution and additionally for yield, i.e. to peruse information shape some gadget like sensor or to give its yield to some yield gadget. Some pins have the Dual usefulness, which has been said in section in Pin Diagram underneath. Double practically like for intrude on, counters, clocks and so forth.

 Circuit Diagram :

 

Code:

// C Program for LED Interfacing with 89S52 8051 Microcontroller
#include <REGX52.h>
delay(unsigned int y)
{
    unsigned int i,j;
    for(i=0;i<y;i++)
    {
        for(j=0;j<1275;j++)
        {
        }
    }
}
main()
{
    while(1)
    {
        delay(100);
        P1_0 = 0;
        delay(100);
        P1_0 = 1;
    }
}

ASSEMBLY LANGUAGE PROGRAM :

ORG 00H

MAIN: MOV P1,#0FFH

LOOP1: CPL P1.0

DELAY:DJNZ R1,DELAY

DJNZ R0,DELAY

JMP LOOP1

END

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