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5 DATA EEPROM
5.1 INTRODUCTION
The Electrically Erasable Programmable Read
Only Memory can be used as a non volatile back-
up for storing data. Using the EEPROM requires a
basic access protocol described in this chapter.
5.2 MAIN FEATURES
I
Up to 32 Bytes programmed in the same cycle
I
EEPROM mono-voltage (charge pump)
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Chained erase and programming cycles
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Internal control of the global programming cycle
duration
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WAIT mode management
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Readout protection against piracy
Figure 6. EEPROM Block Diagram
EECSR
HIGH VOLTAGE
PUMP
0
E2LAT
0
0
0
0
0
E2PGM
EEPROM
MEMORY MATRIX
(1 ROW = 32 x 8 BITS)
ADDRESS
DECODER
DATA
MULTIPLEXER
32 x 8 BITS
DATA LATCHES
ROW
DECODER
DATA BUS
4
4
4
128
128
ADDRESS BUS
1