This document provides an overview of EEPROM memory and how to access it in AVR microcontrollers. It defines EEPROM as non-volatile memory that retains data even when power is lost. Some applications of EEPROM mentioned include passwords, production lines, and washing machines. The document then demonstrates how to write and read from EEPROM locations in code using the eeprom_write_byte and eeprom_read_byte functions. Finally, contact information is provided for any questions.

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05-EEPROM Memory.
By : Mohamed Fawzy
Programming AVR Microcontrollers
© Mohamed F.A.B 2015

2. Lecture Notes:
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o Set Your Phone To Vibration Mode.
o Ask any time.
o During labs, Feel Free To Check Any Materials or
Internet.
o Slides are self content.
o Feel Free To Share This Materials With Your Friends.
o Work Hard For Achieving Most Of This Course.
© Mohamed F.A.B 2015

3. 3
Don't Forget !!!!
© Mohamed F.A.B 2015
Any Expert Was Once A Beginner


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Lesson(11).
© Mohamed F.A.B 2015
Lesson (11):
Using internal EEPROM.

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Lesson (11) Topics.
© Mohamed F.A.B 2015
► What is EEPROM.
► EEPROM Applications.
► Accessing EEPROM in codevision AVR.

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What is EEPROM?
© Mohamed F.A.B 2015
 It’s a non-volatile memory which keep holding data
even if power is losses.
 The contents of the EEPROM may be changed
during operation (similar to RAM), but remains
permanently saved even upon the power supply
goes off (similar to ROM).
 It can be founded inside microcontroller or on
separate package.

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EEPROM Applications.
© Mohamed F.A.B 2015
 Password.
 Production Lines.
 Washing Machine.
 etc………

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Accessing EEPROM in
© Mohamed F.A.B 2015
Writing character to EEPROM:
eeprom_write_byte(address,value);
EX:
eeprom_write_byte(0,25); //write value 25 in byte 0
Reading character from EEPROM:
eeprom_read_byte(address);
EX:
val=eeprom_read_byte(0); //load variable val with
value stored in byte 0
By default all EEPROM bytes holds 255.
NOTE
Try to write implementation of these two functions.
Exercise

9. 9
Questions:
© Mohamed F.A.B 2015

10. Thank You All 
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mo7amed.fawzy33@gmail.com
01006032792
fawzy.fab@gmail.com
© Mohamed F.A.B 2015