L9803 datasheet(101/126 Pages) STMICROELECTRONICS

101 / 126 page

L9803

On-Chip Peripherals

101/126

Figure 47.

EEPROM Block Diagram

5.9.2

Functional description

Read operation (E2LAT=0)

The EEPROM can be read as a normal ROM/RAM location when the E2LAT bit of the CR

evaluate the stored byte which is put on the data bus.

Write operation (E2LAT=1)

The EEPROM programming flowchart is shown in Figure 49.

To access the write mode, the LAT with E2LAT bit has to be set by software (the E2PGM bit

remains cleared). When a write access to the EEPROM area occurs, the value is latched

inside the 16 data latches according to its address.

When E2PGM bit is set by the software, all the previous bytes written in the data latches (up

to 16) are programmed in the EEPROM cells. The effective high address (row) is

determined by the last EEPROM write sequence. To avoid wrong programming, the user

must take care that all the bytes written between two programming sequences have the

same high address: only the four Least Significant Bits of the address can change.

BUFFER

ROW

DECODER

4*8 BITS

DATA LATCHES

DATA

MULTIPLEXER

HIGH VOLTAGE PUMP

EEPROM

MEMORY

MATRIX

1 ROW = 4 * 8 BITS

ADDRESS

DECODER

ADDRESS

BUS

DATA

BUS

E2ITE E2LAT E2PGM

EEPCR

INTERRUPT

REQUEST

FALLING

EDGE

DETECTOR

8 bit

Read amplifiers

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