M24M02E-F datasheet(12/54 Pages) STMICROELECTRONICS

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5.5

Device addressing

To start communication between the bus controller and the target device, the bus controller must initiate a start

condition. Following this and unless the product is delivered with the pre-programmed device address, the bus

controller sends the device select code and byte address as specified in Table 9, Table 10, and Table 11. When

the device select code is received, the device responds only if the bit b3 value matches the value of the C2 bit

programmed in the configurable device address register.

If a match occurs, the corresponding device gives an acknowledgment on serial data (SDA) during the ninth bit

time. If the device does not acknowledge the device select code, the device deselects itself from the bus, and

goes into standby mode (therefore it does not acknowledge the device select code).

The eighth bit is the read/write bit (RW). This bit is set to 1 for read and 0 for write operations.The 256

‑Kbyte

‑Mbit) are addressed with 18 address bits, the 16 lower address bits being defined by the two address bytes

and the most significant address bit (A17 and A16) being included in the device select code (see Table 9).

Table 9. Device select code

Features

Device type identifier bits

Chip enable address bits(1) Address bit

Bit 7 (MSB)(2) Bit 6 Bit 5 Bit 4

Bit 3

Bit 2 Bit 1 Bit 0 (LSB)

Memory

A17

A16

Device type identifier

X(3)

Configurable device address

Software write protection

Identification page

Identification page lock

1. C2 is compared with the value read on bit b3 of the CDA register.

2. The most significant bit, b7, is sent first.

3. X = Don't care bit

Table 10. First byte address

Features

Bit 7 (MSB)(1)

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0 (LSB)

Memory

A15

A14

A13

A12

A11

A10

Device type identifier

X(2)

Configurable device address

Software write protection

Identification page

Identification page lock

1. The most significant bit, b7, is sent first.

2. X = Don't care bit.

M24M02E-F

Device operation

DS14157 - Rev 2

page 12/54

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