ST72344S2 datasheet(31/247 Pages) STMICROELECTRONICS

31 / 247 page

ST72344xx, ST2345xx

Data EEPROM

Doc ID 12321 Rev 6

31/247

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

●

Readout protection

Figure 7.

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 8 describes these

different memory access modes.

EECSR

HIGH VOLTAGE

PUMP

E2LAT

E2PGM

EEPROM

MEMORY MATRIX

(1 ROW = 32 x 8 BITS)

ADDRESS

DECODER

DATA

MULTIPLEXER

32 x 8 BITS

DATA LATCHES

ROW

DECODER

DATA BUS

128

ADDRESS BUS

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