VTech Alphabert s Magic Readport User Manual download pdf (Page 10)

Lab Manual of Microcontroller & Interfacing Page 10

EXPERIMENT NO. 2

AIM: Write a C language programs to…

• Read data from port P2 and P3. Add data and display result on port P0. Glow LED

connected at port pinP1.1 if carry flag set after addition.

• Read data from port P2 and P3. Multiply data and display result on port P0 and P1.

• Write program to read switch connected at port pin P1.0, toggle it and send to port pin

P1.1.

C Language Programs:

Program 1: Read data from port P2 and P3. Add data and display result on port P0. Glow

LED connected at port pinP1.1 if carry flag set after addition.

 # include <reg51.h>

void main(void)

{

unsigned char a,b,c;

P2=0xff; //Define port P2 as an input port

P3=0xff; //Define port P3 as an input port

P0=0x00; //Define port P0 as an output port

P1=0x00; //Define port P1 as an output port

P1=0x01; //Make LED off

a=P2; //Read port P2

b=P3; //Read port P3

c=a+b; //Add content of port P2 and P3

P0 = c; //Display result on port P0

if(CY==1)

{

P1=0x00; //Glow LED connected at P1.0 common anode mode

}

Program 2: Read data from port P2 and P3. Multiply data and display result on port P0 &

P1.

 # include <reg51.h>

void main(void)

{

unsigned char a,b;

unsigned int c;

P2=0xff; //Define port P2 as an input port

P3=0xff; // Define port P3 as an input port

P0=0x00; //Define port P0 as an output port

P1=0x00; //Define port P1 as an output port

a=P2; //Read port P2

b=P3; //Read port P3

c=a*b; //Multiply content of port P2 and P3

P0 = ACC; //Display accumulator content on port P0

P1=B; //Display register B content on port P1

}

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VTech Alphabert s Magic Readport User Manual Page 10

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