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M24LR04E-R 데이터시트(PDF) 23 Page - STMicroelectronics

부품명 M24LR04E-R
상세설명  4-Kbit EEPROM with password protection, dual interface & energy harvesting: 400 kHz I²C bus & ISO 15693 RF protocol at 13.56 MHz
PDF  142 Pages
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제조업체  STMICROELECTRONICS [STMicroelectronics]
홈페이지  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

M24LR04E-R 데이터시트(HTML) 23 Page - STMicroelectronics

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M24LR04E-R
System memory area
Doc ID 022208 Rev 5
23/142
4
System memory area
4.1
M24LR04E-R block security in RF mode
The M24LR04E-R provides a special protection mechanism based on passwords. In RF
mode, each memory sector of the M24LR04E-R can be individually protected by one out of
three available passwords, and each sector can also have Read/Write access conditions
set.
Each memory sector of the M24LR04E-R is assigned with a Sector security status byte
including a Sector Lock bit, two Password Control bits and two Read/Write protection bits,
as shown in Table 7.
Table 6 describes the organization of the Sector security status byte, which can be read
using the Read Single Block and Read Multiple Block commands with the Option_flag set
to 1.
On delivery, the default value of the SSS bytes is set to 00h.
When the Sector Lock bit is set to 1, for instance by issuing a Lock-sector command, the two
Read/Write protection bits (b1, b2) are used to set the Read/Write access of the sector as
described in Table 8.
The next two bits of the Sector security status byte (b3, b4) are the password control bits.
The value of these two bits is used to link a password to the sector, as defined in Table 9.
Table 6.
Sector security status byte area
I2C byte address
Bits [31:24]
Bits [23:16]
Bits [15:8]
Bits [7:0]
E2 = 1
0
SSS 3
SSS 2
SSS 1
SSS 0
Table 7.
Sector security status byte organization
b7
b6
b5
b4
b3
b2
b1
b0
0
0
0
Password control bits
Read / Write
protection bits
Sector
Lock
Table 8.
Read / Write protection bit setting
Sector
Lock
b2, b1
Sector access
when password presented
Sector access
when password not presented
0
xx
Read
Write
Read
Write
1
00
Read
Write
Read
No Write
1
01
Read
Write
Read
Write
1
10
Read
Write
No Read
No Write
1
11
Read
No Write
No Read
No Write



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