Datasheet

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ST7LITE20F2 ST7LITE25F2 ST7LITE29F2 Data EEPROM
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5 Data EEPROM
5.1 Introduction
The Electrically Erasable Programmable Read Only Memory can be used as a non-volatile
backup for storing data. Using the EEPROM requires a basic access protocol described in
this chapter.
5.2 Main features
• Up to 32 bytes programmed in the same cycle
• EEPROM mono-voltage (charge pump)
• Chained erase and programming cycles
• Internal control of the global programming cycle duration
• WAIT mode management
• Read-out protection
Figure 6. EEPROM block diagram
5.3 Memory access
The Data EEPROM memory read/write access modes are controlled by the E2LAT bit of the
EEPROM Control/Status register (EECSR). The flowchart in Figure 7 describes these
different memory access modes.
EECSR
High voltage
pump
0 E2LAT00 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
128128
Address bus