EEPROM stands for Electrical Erasable Programmable Read Only Memory and also referred to as E²PROM. As name suggest, an EEPROM can be both erased and programmed with electrical pulses. Since it can be both electrically written into and electrically erased, EEPROM can be rapidly programmed and erased in circuit for reprogramming without removing them from circuit board.
EEPROM is also called a non-volatile memory because when power is turned off stored data in EEPROM will not be erased or intact. New EEPROM have no data in it and usually have to program with a programmer before it can be use. Information stored in this type of memory can be retained for many years without a steady power supply.
What is function of EEPROM? EEPROMs are used to store user programmable information such as: -
• VCR programming information • CD programming information • Digital satellite receiver control data • User information on various consumer products
EEPROM in monitor performs two functions: -
• When a monitor is switch on it will copies all data or information from EEPROM to microprocessor. For example, EEPROM will let microprocessor know frequencies at which monitor is going to operate.
• The EEPROM is used to store current settings of monitor. The settings of monitor will not be erased even when monitor is turned off. Anytime a change is made in monitor settings, microprocessor updates setting in EEPROM. When monitor is turn on again, stored settings are used to set up monitor for operation.