This chapter is about Electrically-Erasable Programmable Read-Only Memory. EEPROM memory is used in digital devices as nonvolatile storage, such as in flash drives, BIOS chips, and in memory storage facilities. In PIC microcontrollers EEPROM memory is used as semi-permanent data storage because EEPROM can be erased and reprogrammed electrically without removing the chip. The technology used before the development of EEPROM, called EPROM, required that the chip be removed from the circuit and placed under ultraviolet light in order to erase it. In addition, EPROM required higher - than-TTL voltages for reprogramming while EEPROM does not. In this chapter we refer to data EEPROM as implemented in ...
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