Editing EEPROM (section)

===Serial bus devices===
The common serial interfaces are [[Serial Peripheral Interface Bus|SPI]], [[I²C]], [[Microwire]], [[UNI/O]], and [[1-Wire]]. These use from 1 to 4 device pins and allow devices to use packages with 8 pins or less.

A typical EEPROM serial protocol consists of three phases: [[Opcode|OP-code phase]], address phase and data phase. The OP-code is usually the first 8 bits input to the serial input pin of the EEPROM device (or with most I²C devices, is implicit); followed by 8 to 24 bits of addressing, depending on the depth of the device, then the read or write data.

Each EEPROM device typically has its own set of OP-code instructions mapped to different functions. Common operations on [[Serial Peripheral Interface Bus|SPI]] EEPROM devices are:
* Write enable (WRENAL)
* Write disable (WRDI)
* Read status register (RDSR)
* Write status register (WRSR)
* Read data (READ)
* Write data (WRITE)

Other operations supported by some EEPROM devices are:
* Program
* Sector erase
* Chip erase commands