Programmable Electrically-erasable read-only memory
The memory EEPROM ( Programmable Electrically-Erasable Read-Only Memory or erasable electrically and programmable read-only memory) (also called E2PROM or E ² PROM ) of Read-only memory is a type. A read-only memory is a memory used to record information which should not be lost when the apparatus which contains them is supplied more with electricity.
Operation
The contents of memory EEPROM can be easily unobtrusive using an electric current.
PROM versus EEPROM
With the difference in a memory PROM which can be programmed only once, a memory EEPROM can be unobtrusive and reprogrammed several times (of: 100000 with: 1000000 of times) and can be read ad infinitum.
EPROM versus EEPROM
Whereas it is necessary to withdraw it apparatus and to subject it to an ultraviolet radiation to erase the memory EPROM, memory EEPROM can be unobtrusive by a simple electric current without it not being necessary to withdraw it apparatus which contains it.
The memories Flash
The memories Flash are a variety of fast and erasable memory EEPROM by complete sector, and not by individual box. One finds several interfaces to address them, series (24cxx) ordered by bus I2C, SPI,… or parallels (29cxx), in 8/16/32 bits. It is this type of memory which is used in BIOS mother charts and in electronic charts where they record information inherent in the chart as the Adresse MAC, the name of the manufacturer or the type of product. It are also useful in the memory cards SD, USB and CompactFlash.
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