Interfacing eeprom with 89c51

[silaj86]

hi
i want to interface 89c51 with eeprom and save the data in eeprom from 89c51. can antbody helps me???
ineed code

Regards
Faizan

 

[ericgibbs]

hi
i want to interface 89c51 with eeprom and save the data in eeprom from 89c51. can antbody helps me???
ineed code

Regards
Faizan

hi,
Look at these on this link.
Interfacing eeprom with 89c51 - Google Search

 

[mike13]

hi
here is the code in c
include<intrins.h> //For using [_nop_()]
sbit sda=P1^0;
sbit scl=P1^1;
sbit led=P0^3;
bit ack;
sbit led1=P0^1;
sfr lcd_data_pin=0xA0;//p2 port
sfr output=0x80;//p0 port
sbit rs=P3^0;
sbit rw=P3^1;
sbit en=P3^6;
unsigned char reead,write,write2,i,j;
unsigned int temp;
void delay(unsigned int count)
{
int i,j;
for(i=0;i<count;i++)
for(j=0;j<1275;j++);
}
void lcd_command(unsigned char comm)
{
lcd_data_pin=comm;
en=1;
rs=0;
rw=0;
delay(1);
en=0;
}
void lcd_data(unsigned char disp)
{
lcd_data_pin=disp;
en=1;
rs=1;
rw=0;
delay(1);
en=0;
}
lcd_dataa(unsigned char *disp)
{
int x;
for(x=0;disp[x]!=0;x++)
{
lcd_data(disp[x]);
}
}
void lcd_ini()
{
lcd_command(0x38); // for using 8-bit 2 row LCD
delay(5);
lcd_command(0x0F); // for display on, cursor blinking
delay(5);
lcd_command(0x80);
delay(5);
}
void aknowledge() //acknowledge condition
{
scl=1;
_nop_();
_nop_();
scl=0;
}
void start() //start condition
{
sda=1;
scl=1;
_nop_(); //No operation
_nop_();
sda=0;
scl=0;
}
void stop() //stop condition
{
sda=0;
scl=1;
_nop_();
_nop_();
sda=1;
scl=0;
}
void send_byte(unsigned char value) //send byte serially
{
unsigned int i;
unsigned char send;
send=value;
for(i=0;i<8;i++)
{
sda=send/128; //extracting MSB
send=send<<1; //shiftng left
scl=1;
_nop_();
_nop_();
scl=0;
}
ack=sda; //reading acknowledge
sda=0;
}
unsigned char read_byte() //reading from EEPROM serially
{
unsigned int i;
sda=1;
reead=0;
for(i=0;i<8;i++)
{
reead=reead<<1;
scl=1;
_nop_();
_nop_();
if(sda==1)
reead++;
scl=0;
}
sda=0;
return reead; //Returns 8 bit data here
}
void save() //save in EEPROM
{
start();
send_byte(0xA0); //device address
aknowledge();
send_byte(0x00); //word address
aknowledge();
send_byte(5); //send data
aknowledge();
send_byte(65);
aknowledge();
stop();
if(ack==0)
{
led1=1;
delay(100);
led1=0;
delay(100);
lcd_command(0x86);
lcd_data('5');
lcd_command(0x87);
lcd_data('A');
}
else
led1=1;
aknowledge();
}
void Read()
{
start();
send_byte(0xA0);
aknowledge();
send_byte(0x00);
aknowledge();
start();
send_byte(0xA1); //device address
aknowledge();
i=read_byte();
aknowledge();
j=read_byte();
aknowledge();
stop();
if(i==5)
{
led=0;
delay(100);
led=1;
delay(100);
write=i+48;
lcd_command(0xC6);
lcd_data(write);
}
else
led=1;
if(j==65)
{
lcd_command(0xC7);
lcd_data(j);
}
aknowledge();
}

void main()
{
lcd_ini();
lcd_dataa("Sent :");
lcd_command(0xC0);
lcd_dataa("Read :");
temp=0;
while(1)
{
save();
Read();
}
}

visit serial **broken link removed** or 8051 projects for more 8051 based projects

 

[aishiqi]

buy a 24cxx,and download its data sheet,if you know I2C,it will be very easy.

 

[sush4semi]

Hello...
i have utilized the same code.... how do i store data like "19:29:23" in EEPROM and how do i read it from EEPROM. because the code u have specified above has a control over one character at a time.....

 

[sush4semi]

just give me a bit of idea... i shall solve it by myself.... plz help me...


Regards...