M39832 datasheet(14/36 Pages) STMICROELECTRONICS

14 / 36 page

READ

Read operations and instructions can be used to:

– read the contents of the Memory Array (Flash

and EEPROM)

– read the status bits and identifiers.

Read data (Flash and EEPROM)

Both Chip Enable EF (or EE) and Output Enable

(G) must be low in order to read the data from the

memory.

Read the Manufacturer Identifier

The manufacturer’s identifier can be read with two

methods: a Read operation or a Read instruction.

Read Operation. The manufacturer’s identifier can

be read with a Read operation with specific logic

levels applied on A0, A1, A6 and the VID level on

A9 (See Table 7).

Read Instruction. The manufacturer’s identifier

can also be read with a single read operation

immediatly following the AS instruction (See Table

5A and Table 7).

Read the Flash Identifier

The Flash identifier can be read with two methods:

a Read operation or a Read instruction.

Read Operation. The Flash identifier can be read

with a single Read operation with specific logic

levels applied on A0, A1, A6 and the VID level on

A9 (See Table 7).

Read Instruction. The Flash identifier can also be

read with a single read operation immediatly follow-

ing the AS instruction (See Table 5A and Table 7).

AI01699B

WRITE AAh in

Address 5555h

WRITE 55h in

Address 2AAAh

WRITE 80h in

Address 5555h

Unprotected State

after

tWC (Write Cycle time)

WRITE AAh in

Address 5555h

WRITE 55h in

Address 2AAAh

WRITE 20h in

Address 5555h

Page

Write

Instruction

Figure 5. EEPROM SDP disable Flowchart

READ DQ5 & DQ7

at VALID ADDRESS

START

READ DQ7

FAIL

PASS

AI01369

DQ7

DATA

YES

DQ5

= 1

DQ7

DATA

YES

Figure 6. EEPROM and Flash Data Polling

Flowchart

14/36

M39832

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