M24LR64E-R datasheet(27/140 Pages) STMICROELECTRONICS

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M24LR64E-R

System memory area

Doc ID 022712 Rev 3

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4.2

M24LR64E-R block security in I²C mode (I2C_Write_Lock bit

area)

In the I2C mode only, it is possible to protect individual sectors against Write operations.

This feature is controlled by the I2C_Write_Lock bits stored in the 2 bytes of the

I2C_Write_Lock bit area. I2C_Write_Lock bit area starts from location 8192 (see Table 13).

To access the I2C_Write_Lock bit area, the device select code used for any I2C command

must have the E2 Chip Enable address at 1.

Using these 16 bits, it is possible to write-protect all the 16 sectors of the M24LR64E-R

memory. Each bit controls the I2C write access to a specific sector as shown in Table 13. It

is always possible to unprotect a sector in the I2C mode. When an I2C_Write_Lock bit is

reset to 0, the corresponding sector is unprotected. When the bit is set to 1, the

corresponding sector is write-protected.

In I2C mode, read access to the I2C_Write_Lock bit area is always allowed. Write access

depends on the correct presentation of the I2C password.

On delivery, the default value of the eight bytes of the I2C_Write_Lock bit area is reset to

00h.

4.3

Configuration byte and Control register

The M24LR64E-R offers an 8-bit non-volatile Configuration byte located at I²C location 2320

of the system area used to store the RF WIP/BUSY pin and the energy harvesting

configuration (see Table 14).

The M24LR64E-R also offers an 8-bit volatile Control register located at I²C location 2336 of

the system area used to store the energy harvesting enable bit as well as a FIELD_ON bit

indicator (see Table 15).

Protection: pswd 1

Read

Write

xxx

0110

Protection: pswd 1

Read

No Write

xxx

0111

Table 12.

M24LR64E-R sector security protection after a valid presentation of

password 1

Sector

address

Sector security status byte

b7b6b5 b4 b3 b2 b1 b0

Table 13.

I2C_Write_Lock bit

I2C byte address

Bits [31:24]

Bits [23:16]

Bits [15:8]

Bits [7:0]

E2 = 1

2048

sectors 31-24

sectors 23-16

sectors 15-8

sectors 7-0

E2 = 1

2052

sectors 63-56

sectors 55-48

sectors 47-40

sectors 39-32

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