Many times, the scope of variables is limited to a single block, such as an if block or a for loop block. When device turned-on this FLASH-resident data is copied to SRAM, and the software accesses d ataVar from SRAM whenever possible. char d ataVar = 'This is some data' ġ7 bytes of SRAM will be allocated, and the text “This is some data” will be physically placed in FLASH memory. RAM stands for or you can say full form of RAM is Read Access Memory. SRAM (Static RAM) and DRAM (Distributed RAM) are the two types of RAM (Dynamic RAM).Īll variables you use, such as int, float, and/or string, are open over RAM for calculation at the time of program execution. In Arduino UNO (ATMEGA328), the number of write/erase cycles for flash memory is limited to an average of 10,000 cycles. You’re probably aware that the ATMEGA328 microcontroller used in the Arduino Uno has 32 KB of flash memory. This is identical to the BIOS on a general-purpose computer. In simple terms, the program you upload to the microcontroller as a hex file is saved in Flash memory. Flash memory is known as Non Volatile memory. Flash memoryįlash memory is a type of memory that is used to store data that does not alter over time. There are various types of memories, including Flash memory, cache memory, RAM, and EEPROM. Using the EEPROM put and EEPROM get functions, the software below illustrates how to read and write to EEPROM. You”ll also learn how to use EEPROM in Arduino and ESP microcontrollers (ESP8266 and ESP32). This article will explain what an EEPROM is and provide a brief overview of the other memories available in a microcontroller.

Arduino write to eeprom