M34C02 datasheet(6/19 Pages) STMICROELECTRONICS

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M34C02

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Figure 5. How to Set the Write Protection

Figure 6. Write Mode Sequences in the Non Write-Protected Area

Default EEPROM memory area

state before write access

to the Protect Register

AI01936C

Standard

Array

FFh

Standard

Array

80h

7Fh

00h

Standard

Array

FFh

Write

Protected

Array

80h

7Fh

00h

State of the EEPROM memory

area after write access

to the Protect Register

Memory

Area

BYTE WRITE

DEV SEL

BYTE ADDR

DATA IN

PAGE WRITE

DEV SEL

BYTE ADDR

DATA IN 1

DATA IN 2

AI01941

DATA IN N

ACK

R/W

ACK

R/W

ACK

significant bits only) is incremented. The transfer is

terminated by the master generating a STOP

condition.

When the master generates a STOP condition

immediately after the Ack bit (in the “10th bit” time

slot), either at the end of a byte write or a page

write, the internal memory write cycle is triggered.

A STOP condition at any other time does not

trigger the internal write cycle.

During the internal write cycle, the SDA input is

disabled internally, and the device does not

respond to any requests.

Minimizing System Delays by Polling On ACK

During the internal write cycle, the memory

disconnects itself from the bus, and copies the

data from its internal latches to the memory cells.

The maximum write time (tw) is shown in Table 9,

but the typical time is shorter. To make use of this,

an Ack polling sequence can be used by the

master.

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