M24LRxx’s conditional memory access

AN3002

14/22

Doc ID 15912 Rev 2

shown in Table 9: I2C memory access condition at power on.

All the memory sectors can be read, and write operations are allowed on all sectors except

for sectors 1 & 2.

Note:

The I2C_Write lock bit area can be accessed in read mode only.

the M24LRxx’s sector access conditions are modified as described in Table 10: I2C memory

access condition after a valid I2C Present Password.

All the 64 sectors of the M24LRxx are open to any write and read commands.

The I2C_Write lock bit area can also be updated to remove or add sector write protections.

The write protection of the sector 2 can be removed by resetting bit b2 to 0 and the sectors

62 & 63 can be write-protected by setting the bits b62 & b63 to 1.

Note:

It is also possible to update the Sector security status bytes used to define the read and

Table 9.

Access condition

M24LRxx user memory

Read and Write

Sector 0

Read only

Sector 1

Read only

Sector 2

Read and Write

Sector 3

Read and Write

…

Read and Write

Sector 62

Read and Write

Sector 63

Read only

I2C_Write lock bit area

Read only

Sector_Security_Status area