M39832 datasheet(13/36 Pages) STMICROELECTRONICS

13 / 36 page

Write. A Write operation can be used for two goals:

– either write data in the EEPROM memory array

– or enter a sequence of bytes or word composing

an instruction.

The reader should note that Programming a Flash

byte or word is an instruction (see Instructions

paragraph).

Writing data requires:

– the Chip Enable (either EE or EF) to be Low

– the Write Enable (W) to be Low with Output

Enable (G) High.

Addresses in Flash array (or EEPROM array) are

latched on the falling edge of W or EF (EE) which-

ever occurs last; the data to be written in Flash

array (EEPROM array) is latched on the rising edge

of W or EF (EE) whichever occurs first.

Specific Read and Write Operations. Device

specific data is accessed through operations de-

coding the VID level applied on A9 and the logic

levels applied on address inputs (A0, A1, A6).

These specific operations are:

– Read the Manufacturer identifier

– Read the Flash identifier

– Define and Read the Flash Block protection

status

– Read the EEPROM identifier

– Write the EEPROM identifier

Note: The OTP row (64 bytes) is accessed with a

specific software sequence detailed in the para-

graph "Write in OTP row".

Instructions

An instruction is defined as a sequence of specific

Write operations. Each received byte or word is

sequentially decoded (and not executed as stand-

ard Write operations) and the instruction is exe-

cuted when the correct number of bytes or word

are properly received and the time between two

consecutive bytes or words is shorter than the

time-out value.

The sequencing of any instruction must be followed

exactly, any invalid combination of instruction bytes

or word or time-out between two consecutive bytes

or word will reset the device logic into a Read

memory state (when addressing the Flash array)

or directly decoded as a single operation when

addressing the EEPROM array.

For efficient decoding of the instruction, the two first

bytes or words of an instruction are the coded

cycles and are followed by a command confirma-

tion byte or word.

AI01698B

WRITE AAh in

Address 5555h

WRITE 55h in

Address 2AAAh

WRITE A0h in

Address 5555h

SDP is set

WRITE AAh in

Address 5555h

WRITE 55h in

Address 2AAAh

WRITE A0h in

Address 5555h

WRITE Data to

be Written in

any Address

SDP ENABLE ALGORITHM

Page

Write

Instruction

Page

Write

Instruction

WRITE

is enabled

SDP

Set

SDP

not Set

Write

in Memory

Write Data

SDP Set

after tWC

Figure 4. EEPROM SDP Enable Flowcharts

13/36

M39832

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