This post provides the code for interfacing 24LC64 EEPROM with PIC16F877 microcontroller. This 24LC64 EEPROM has i2c based interface.
This code is written in C language using MPLAB with HI-TECH C compiler. You can download this code from the ‘Downloads‘ section at the bottom of this page.
It is assumed that you know how to interface LCD with PIC16F877 microcontroller in 4bit mode. If you don’t then please read this page first, before proceeding with this article. It is also assumed that you know how to use i2c module in PIC16F877, if you don’t then please read this page first. You should also read how to write/read a byte in/from 24LC64 EEPROM from it’s datasheet.
The result of simulating the code in Proteus is shown below.
In the above circuit, RC4 pin is being used as SDA pin and RC3 pin is the SCK pin. Both of these pins are pulled up using 10K resistors as required for i2c protocol. 24LC64 EEPROM is the slave device, while PIC16F877 is configured to be the master. LCD is also attached with PIC16F877, just to show the values received from the EEPROM, otherwise it is not required in this circuit. Proteus provides an ‘I2C Debugger Tool‘ which is attached on the SDA and SCK pins in the above circuit, this debugger shows all the activity on i2c bus. It is attached in the circuit just for debugging purposes.
In the code, string ‘Saeed’ is stored in the 24LC64 EEPROM and then retrieved back and displayed on the LCD. As shown in Figure 1, ‘Saeed‘ is correctly displayed on the LCD, this shows that it was stored and retrieved from 24LC64 EEPROM successfully.
The code for the main function is shown below.
24LC64 EEPROM interfacing with PIC16F877 code was compiled in MPLAB v8.85 with HI-TECH C v9.83 compiler and simulation was made in Proteus v7.10. To download code and Proteus simulation click here.