Using EEPROM Memory

This example illustrates write to and read from built-in EEPROM memory. The program works as follows. The main loop constantly reads EEPROM memory location at address 5 (decimal). The program then enters an endless loop in which PORTB is incremented  and PORTA.2 input state is checked. At the moment of pressing the push button called MEMO, a number stored in PORTB will be saved in EEPROM and directly read and shown on PORTD in binary form.

In order  to check  this  circuit,  it is sufficient  to press  the MEMO  button  and turn  off the device.  After  restarting  the  device,  the  program  will  display  the  saved  value  on  port  D. Remember that at the moment of writing, this value was displayed on port B).

In order to make this example work properly, it is necessary to tick off the EEPROM library in the Library Manager prior to compiling:

§                    EEPROM