this ppt gives information about using 8051 pins as input and outpins , lcd module interfacing to 8051

1. 8051 Programming

2. Assembly language----- includes mnemonics
Example: ADD, SUB, MUL, RR…
Assembly Language-----Assembler---Binary
Disadvantage:
We should know about architecture of microcontroller or
microcontroller

3. Higher level languages : c ,java
( c, c++,java)------compiler----binary
Advantage:
No need to consider about architecture of µp/µc….just
few features are considered

4. STEPS FOLLOWED IN CONVERTING SOURCE FILE TO HEX. FILE

5. EMBEDDED C
DATA TYPES USED IN EMBEDDED C
Integer int x;
Unsigned integer unsigned int x;
Char char x;
Unsigned char unsigned char x;

6. 1) BASIC PORT PROGRAMMING
P0 -------
P0=____________?
MSB LSB

7. BASIC PORT PROGRAMMING……………………
P0-------
8 4 2 1 8 4 2 1
ANS: P0=0X55

8. Syntax to be followed:
Pin declaration:
sbit variablename = PX ^Y;
Where,
x=0,1,2,3 port
y=0,1,2,3,4,5,6,7 pins
Example: sbit led = P1^0;

9. WAP to blink a led which is connected to port2 , pin 0
#include<reg52.h>
sbit led = P2^0;
unsigned int i;
void main()
{
P2=0x00;
led =1;
for(i=0; i<1000; i++);
led =0;
for(i=0; i<1000; i++);
}

10. Syntax to be followed:
port declaration:
#define variablename Px
Where,
x=0,1,2,3
Example: #define segment P1

11. WAP to blink all led’s connected to port2
#include<reg52.h>
#define leds P2
unsigned int i;
void main()
{
leds=0x00;
for(i=0; i<1000; i++);
leds =0xFF;
for(i=0; i<1000; i++);
}

12. INTRODUCTION
TO
KEIL IDE
FOR
80XX PROGRAMMING

13. PROGRAM 1:
WAP to blink a led which is connected to port1 , pin 0
PROGRAM 2:
WAP to blink the led’s which are connected to port1
PROGRAM 3:
WAP to blink the led’s alternatively which are
connected to port1
Practice examples

14. pin7 pin6 pin5 pin4 pin3 pin2 pin1 pin0
0 0 0 0 0 0 0 1
0 0 0 0 0 0 1 0
0 0 0 0 0 1 0 0
0 0 0 0 1 0 0 0
0 0 0 1 0 0 0 0
0 0 1 0 0 0 0 0
0 1 0 0 0 0 0 0
1 0 0 0 0 0 0 0
PROGRAM 4:
WAP to shift a bit of port1 from pin0 to pin7

15. PROGRAM 5:
WAP to shift a bit of port1 from pin7 to pin0
Pin7 pin6 pin5 pin4 pin3 pin2 pin1 pin0
1 0 0 0 0 0 0 0
0 1 0 0 0 0 0 0
0 0 1 0 0 0 0 0
0 0 0 1 0 0 0 0
0 0 0 0 1 0 0 0
0 0 0 0 0 1 0 0
0 0 0 0 0 0 1 0
0 0 0 0 0 0 0 1

16. PROGRAM 6:
WAP to shift a bit of port1 from pin0 to pin7
pin7 pin6 pin5 pin4 pin3 pin2 pin1 pin0
0 0 0 0 0 0 0 1
0 0 0 0 0 0 1 1
0 0 0 0 0 1 1 1
0 0 0 0 1 1 1 1
0 0 0 1 1 1 1 1
0 0 1 1 1 1 1 1
0 1 1 1 1 1 1 1
1 1 1 1 1 1 1 1

17. 16X2 LCD Display

18.  8 data pins
3 control pins
supply pins and a potentiometer
1. Two modes
-----Command mode (RS=0)
-----Data mode (RS=1)
2. RW is always logic zero
3. EN=1 to EN=0 for data transfer

19. LCD INITIALIZATION Using commands
0X38 =========2 lines and 5x7 matrix
0x01 ========= clear the display
0x06 ========= shift cursor to right i.e. increment cursor
0x05 ========= shift display right
0x0E ========= display on, cursor blinking
0x80 ========= force cursor to beginning of first line
0xC0 ========= force cursor to beginning of first line

20. To pass command to lcd
8datapins = data
RS=0
RW=0
EN=1
Delay()
EN=0
To pass command to lcd
8datapins = data
RS=1
RW=0
EN=1
Delay()
EN=0

21. void lcd_cmd(unsigned char d)
{
dataport =d;
rs= 0;
rw=0;
e=1;
delay(150);
e=0;
delay(150);
}
void lcd_data(unsigned char f)
{
dataport =f;
rs= 1;
rw=0;
e=1;
delay(150);
e=0;
delay(150);
}
Sample code:

22. WAP to display your name on LCD
Program6:
#include<reg51.h>
#define dataport P2 // for LCD
void delay(int a);
void lcd_cmd(unsigned char d);
void lcd_data(unsigned char f);
sbit rs =P1^0; // rs pin of LCD
sbit rw =P1^2; // rw pin of LCD
sbit e = P1^1; // enable pin of LCD
void delay(int a)
{
int i;
for(i=0;i<a;i++);
}

23. void main(void)
{
lcd_cmd(0x38); //function set
delay(50);
lcd_cmd(0x0C); //display on,cursor off,blink off
delay(50);
lcd_cmd(0x80); //first row
delay(50);
lcd_cmd(0x06); //entry mode, set increment
delay(50);
lcd_cmd(0x80); //first row
delay(10);
dataport=0;
P1=0X00;
lcd_data('E');
delay(10);
lcd_data('C');
delay(10);
lcd_data('E');
delay(1500);
}