I²C-EEPROM 24AA08 von Microchip + ATMega16L

// I2C Bus functions

#asm

   .equ __i2c_port=0x15 ;PORTC

   .equ __sda_bit=1

   .equ __scl_bit=0

#endasm

...

PORTC=0x00;

DDRC=0x20;

...

unsigned char sec;

while(i2c_start()==0);

while(i2c_write(0b10100000)==0);  //Slaveaddr + WRITE               

while(i2c_write(0x01)==0);        //Pageaddr

while(i2c_write(0x15)==0);        //Testdatum        

i2c_stop();

delay_ms(1000);

while(i2c_start()==0);

while(i2c_write(0b10100000)==0);  //Slaveaddr + WRITE                   

while(i2c_write(0x01)==0);        //Pageaddr

while(i2c_start()==0);            //Start für READ

while(i2c_write(0b10100001)==0);  //Slaveaddr + READ

sec=i2c_read(0);                  //READ ohne Ack               

i2c_stop();