M24M02E-F datasheet(6/54 Pages) STMICROELECTRONICS

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Device features

4.1

Device type identifier register (DTI)

The device type identifier register (DTI) is an 8-bit register permanently locked in read-only mode. This register is

factory programmed with device type identifier bits (DTI3, DTI2, DTI1, and DTI0) set to 1011 and with device type

identifier lock bit (DTIL) set to 1 to freeze definitively the register. DTI3, DTI2, DTI1, and DTI0 are defining the

device type identifier address in the device select code. At power-up, the device loads the last configuration of

DTI3, DTI2, DTI1, DTI0, and DTIL values.

This register is read by issuing the read device type identifier instruction. This instruction uses the same protocol

and format as the random address read (from the memory array) except for the following differences (refer to

Table 9, Table 10 and Table 11).

•

Device type identifier = 1011

•

MSB address bits A15, A14, and A13 must be equal to 111

•

MSB address bits from A12 to A8 are don't care

•

LSB address bits from A7 to A0 are don't care

The description of the device type identifier register is given in Table 2.

Table 2. Device type identifier register

bit 7

bit 6

bit5

bit4

bit3

bit2

bit1

bit0

DTI3 = 1

DTI2 = 0

DTI1 = 1

DTI0 = 1

X(1)

DTIL = 1

1. X = Don’t care bit. Read as 0.

Note:

The factory default value is 10110001.

Table 3. Device type identifier register description

Bit

Function

Bits b7 to b4

DTI3, DTI2, DTI1, DTI0: Device type identifier bits.

b7, b6, b5, b4 are used to configure the device type identifier of the device select code.

•

(b7, b6, b5, b4) = (1, 0, 1, 1) the device type identifier is 1011 (factory default value)

Note: Bits b7 to b4 are frozen at factory delivery.

Bits b3 to b1

Reserved bits. Read as 0. (b3, b2, b1) = (0, 0, 0)

Bit b0

DTIL: Device type identifier lock bit.

b0 indicates that the DTI register status is in read-only mode.

•

(b0) = (1) the device type identifier lock bit is equal to 1 (factory default value)

Note: Bit b0 is frozen at factory delivery.

M24M02E-F

Device features

DS14157 - Rev 2

page 6/54

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