m24lr64-r STMicroelectronics, m24lr64-r Datasheet - Page 24

• Manufacturer Part Number: m24lr64-r
• Description: 64 Kbit Eeprom With Password Protection & Dual Interface 400 Khz I?c Serial Bus & Iso 15693 Rf Protocol At 13.56 Mhz
• Manufacturer: STMicroelectronics

System memory area
4.2
24/126
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Example of the M24LR64-R security protection
Table 11
sector Password command.
power-up. After a valid Present-sector Password command with password 1, the memory
sector access is changed as shown in
Table 11.
Table 12.
Sector
address
Sector
address
0
1
2
3
4
0
1
2
3
4
Present-sector Password:
The Present-sector Password command is used to present one of the three passwords
to the M24LR64-R in order to modify the access rights of all the memory sectors linked
to that password
correct, the access rights remain activated until the tag is powered off or until a new
Present-sector Password command is issued. If the presented password value is not
correct, all the access rights of all the memory sectors are deactivated.
Sector security status byte area access conditions in I
In I
Write access depends on the correct presentation of the I
Present Password command description on page
To access the Sector security status byte area, the device select code used for any I
command must have the E2 Chip Enable address at 1.
An I
condition to the given memory sector.
2
2
C mode, read access to the Sector security status byte area is always allowed.
and
C write access to a Sector security status byte re-initializes the RF access
Protection: Standard
Protection: Pswd 1
Protection: Pswd 1
Protection: Pswd 1
Protection: Pswd 1
Protection: Standard
Protection: Pswd 1
Protection: Pswd 1
Protection: Pswd 1
Protection: Pswd 1
M24LR64-R sector security protection after power-up
M24LR64-R sector security protection after a valid presentation of
password 1
Table 12
(Table
show the sector security protections before and after a valid Present-
Table 11
8) including the password itself. If the presented password is
Doc ID 15170 Rev 9
Read
Read
Read
Read
Read
Read
Read
Read
No Read
No Read
shows the sector access rights of an M24LR64-R after
Table
12.
No Write
Write
Write
Write
No Write
No Write
No Write
Write
No Write
No Write
26).
2
b
b
2
C password (see
Sector security status byte
Sector security status byte
7
7
C mode:
b
xxx
xxx
xxx
xxx
xxx
b
xxx
xxx
xxx
xxx
xxx
6
6
b
b
5
5
b
b
0
0
0
0
0
0
0
0
0
0
4
4
b
b
0
1
1
1
1
0
1
1
1
1
3
3
M24LR64-R
b
b
0
0
1
1
0
0
0
0
1
1
2
I
2
2
C
b
b
0
0
1
0
1
0
0
1
0
1
1
1
b
b
2
1
1
1
1
1
1
1
1
1
1
0
0
C