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M24LR64-R-MB6T/2 数据表(PDF) 62 Page - STMicroelectronics

部件名 M24LR64-R-MB6T/2
功能描述  64 Kbit EEPROM with password protection & dual interface: 400kHz I짼C serial bus & ISO 18000-3 mode 1 RF protocol at 13.56MHz
PDF  126 Pages
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制造商  STMICROELECTRONICS [STMicroelectronics]
网页  http://www.st.com
标志 STMICROELECTRONICS - STMicroelectronics

M24LR64-R-MB6T/2 数据表(HTML) 62 Page - STMicroelectronics

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Request format
M24LR64-R
62/126
Doc ID 15170 Rev 8
19
Request format
The request consists of:
●
an SOF
●
flags
●
a command code
●
parameters and data
●
a CRC
●
an EOF
19.1
Request flags
In a request, the “flags” field specifies the actions to be performed by the M24LR64-R and
whether corresponding fields are present or not.
The flags field consists of eight bits. The bit 3 (Inventory_flag) of the request flag defines the
contents of the 4 MSBs (bits 5 to 8). When bit 3 is reset (0), bits 5 to 8 define the M24LR64-
R selection criteria. When bit 3 is set (1), bits 5 to 8 define the M24LR64-R Inventory
parameters.
Table 23.
General request format
S
O
F
Request_flags
Command code
Parameters
Data
CRC
E
O
F
Table 24.
Definition of request flags 1 to 4
Bit No
Flag
Level
Description
Bit 1
Subcarrier_flag(1)
1.
Subcarrier_flag refers to the M24LR64-R-to-VCD communication.
0
A single subcarrier frequency is used by the M24LR64-R
1
Two subcarrier are used by the M24LR64-R
Bit 2
Data_rate_flag(2)
2.
Data_rate_flag refers to the M24LR64-R-to-VCD communication
0
Low data rate is used
1
High data rate is used
Bit 3
Inventory_flag
0
The meaning of flags 5 to 8 is described in Table 25
1
The meaning of flags 5 to 8 is described in Table 26
Bit 4
Protocol_extension_flag
0
No Protocol format extension
1
Protocol format extension



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