Experiment No. 1

Aim: Write C language program to a) 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.

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

c) Write program to read switch connected at port pin P1.0, toggle it and send to port pin P2.1

Circuit Diagram:

Fig. 1 Circuit diagram of switch interfacing with 8051(c)

Worksheet 1

1) Write C language program to continuously toggle pin P1.0 without disturbing other port pins.

2) Write C language program to perform OR operation between port pin P1.0 and P1.1. Display result on port pin P1.2.

3) Write C language program to read port P1, Compare content of port P1 with data 80h. If data at port P1 is greater than 80h, make port P0=0x00 and if data at port P1 is less than or equal to 80h, make port P0=0xFF.4) Write a program to sense lift door switch connected at port pin P2.0.Switch on the alarm connected at port pin P2.1 if lift door is open. Write program in C language.5) Write a program to design a calculator which performs addition, subtraction and multiplication. Of 2 digit. If :Sw1Sw2

00

01

10

6) Write a program to toggle the p1 port continuously with some delay

7) What is the difference between sbit and bit data type.

_1425450376.vsdP2.2

P0.0

P2.1

39

P2.0

P0.7

P0.6

P0.5

P0.4

P0.3

P0.2

P0.1

PSEN

P2.7

P2.6

P2.5

P2.4

P2.3

P3.7/ RD

P3.6/ WR

ALE

P1.0

P1.1

P3.0/RXD

36

37

38

35

P1.7

P1.6

P1.5

P1.4

P1.3

P1.2

P3.1/TXD

P3.5/T1

P3.4/T0

P3.3/INT1

P3.2/INT0

21

32

33

34

28

GND

26

27

22

23

24

30

29

16

17

20

RST

X2

X1

9

19

18

31

10

11

2

4

1

3

15

12

13

14

8

7

5

6

VCC

EA/ VPP

89s51

GND

GND

10K

10 uF

30 pF

30 pF

11.06MHz

P3.5/T1

GND

VCC

SW1

VCC

40

VCC

1K

LED

25