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An EEPROM is kinds of novalatile memory, that means it is used for storing digital data permanently without any power suply. The advantage of these kind of ROMs is that they can be erased Electrically to make them ready for storing new data.

Compare this with a At,el R disks they can be recorded only once. So if the volume of data you want to store is small say few user names and password then you can use it. The internal eeprom makes design small atnel simple. You can store pictures, sound and long texts in these eeproms. They are available upto KB in size. They uses I2C interface with host controller MCU which is a very popular serial communication standard.

Fine Quality Semiconductor IC Atmel (24C64 SMD)

I will write more indept tutorial on I2C in comming days and in this tutorial I will give you easy to use function that you can use without any knowledge of I2C interface. The chip has storage location which have their unique address ranging from Consider these as storage cells so while storing and retriving data you have to tell the chip which cell location you want to read.

For exaple if you read location you will get 99 see image above. So if you want to store bigget data like int you have to store them in two cells. Connect your ATmega32 with 24C64 chip as shown in the circuit diagram.

You can use any avr development board for the purpose or assemble the whole circuit in a Breadboard or Veroboard. Download and add the following files to your AVR Studio project.

This functions initialize the communication channel.

24C64 Datasheet

If the condition is met the screen shows “Write Successfull” message. The 24C64 was mounted on a Breadboard. The connection is simple. The LCD must be installed to see the output of the program. After powering on the circuit please adjust the 10K POT until the display is clearly visible.

Get quote online easily: Facing problem with your embedded, electronics or robotics project? We are here to help! Post a help request. Avinash Gupta is solely focused on free and high quality tutorial to make learning embedded system fun! More Posts – Website. I am thinking of ATMega16 to use for sending data to a transmitter amel testing purposes. And is there an easy way to do it for big data for ex.


Read them byte by byte in loop and transmit. I think 2c64 byte of data would be enough. I just need to output bytes. I need to output them serially. I have just thought to write it in the program in a loop using if the corresponding bit is 1. I want Baud ca. Hi, What is the value of the resistors connected to the 24c What does that mean? You have a lots of confusion.

First you are manualy sending just bit by bit to a port. In that way you cannot do RS communication. I said serial comm.

I may have used the baud rate wrong but I wonder to know in what freq. I output the bits in the Port? As I know default freq. Sorry for putting on too much confusion. Hi Avinash, I am trying to read data from a file and then store the data in the 24C Do you have any idea how this could be implemented?

I am trying to use fopen for file reading, but it is not working. Any atmrl would be appreciated. I need some help with I2C protocols. One way you can go is to write a bootloader that first loads the program form external memory to internal flash then start execution. I 24c6 all the wiring on breadboard let me know if you want to know which pins i am using.

I search for that then i found that thee is a fuse bit, please tell me about fuse bit ant how can i programme fuse bit.

Fuse byte info here http: I am using 24C I modify address limit as I am using your I2C library with ATmega But its not running or somewaht else after this. I didnt used 4K7 pullups are they very necessary. It gets stuck in the command writting…. I am using AT24C04 what kind of modification i should do in your code to make it compatuble to 24C I already have used your tutorial on RS and I have got data transmitting.

Wikipedia says in their I2C overview that each slave on the I2C bus has an address and in turn there could be multiple slaves connected to the bus. How do I set or learn the address of the 24Cxxx chip? And how to connect if I want to have more than one of these eeproms attached? How do I address them? Yes thats the beauty of I2C bus.

Each slave on it have a unique address, thus many slaves can be connected in parallel in same bus lines. So as many as 8 24C eeprom can be connected in a bus. In the above example I have not connected A1,A2,A3 this means the are 0, 0, 0 to keep it simple. For more details see data sheet. Both of you guys could get away with just one bus master but then the setup would need an interrupt line from each slave, alerting the master that there are data to be processed.


The master will then issue a read command to the slave, fetch the data and process. Whether to choose single-master or multi-master depends on circumstances. From that you can clearly see that the last two pins 15 and 16 are connected to the LED backlight!!! Dear sir, I am using AVR micro controller, atmega 16, in need to communicate TWi interface with other micro controller, I am using code vision for the complier.

24C64 datasheet(10/15 Pages) ATMEL | 2-Wire Serial EEPROM

But from scratch I could learn AVRs in a week!!! Thanks to all ateml efforts to build code libraries and projects that teaches a novice end to end in a short span of time!!! All the contents you have given are so useful, that I am working on a product with all the support libraries and schematics you have furnished in your site. 24f64 power on-reset only once it display the time but after it is not updating time.

Thank for this Library, i using it on my projects. Here is I post your library with comments on russian on my own site.

Interfacing external memory with avr. Thanks for this wonderfull turorialI am working on project where my IO is very limited, this is perfect as I will be storing a large structure in the memory which wont change that often so E2 is perfect for this. Thanks for your tutorial and code! Its wonderful and helpful and I was able to simulate in proteus successfully!!! Clock positive edge was at The final output is obtained in both the frequencies… but my questiion is how does this happen???

Why it is happening please help me. Its displaying C ,ie 67 in lcd for both the values. I’ve not made any changes in your 24C64 code files. It whows write error at address and. I checked all the connections.

Can any one guess probable error.

Raoof Please purchase ready made development board as shown in the article to do the experiment! We cannot help debug your hardware! I agmel tried running the exact functions but unsuccessful, pull upresistors used on my devlopment board are of I tried simulate it using proteus and it works.