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M24LR04E-R 데이터시트(PDF) 68 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) 68 Page - STMicroelectronics

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Request format
M24LR04E-R
68/142
Doc ID 022208 Rev 5
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 M24LR04E-R and
whether corresponding fields are present or not.
The flags field consists of eight bits. Bit 3 (Inventory_flag) of the request flag defines the
contents of the four MSBs (bits 5 to 8). When bit 3 is reset (0), bits 5 to 8 define the
M24LR04E-R selection criteria. When bit 3 is set (1), bits 5 to 8 define the M24LR04E-R
Inventory parameters.
Table 26.
General request format
S
O
F
Request_flags
Command code
Parameters
Data
CRC
E
O
F
Table 27.
Definition of request flags 1 to 4
Bit No
Flag
Level
Description
Bit 1
Subcarrier_flag(1)
1.
Subcarrier_flag refers to the M24LR04E-R-to-VCD communication.
0
A single subcarrier frequency is used by the
M24LR04E-R
1
Two subcarrier are used by the M24LR04E-R
Bit 2
Data_rate_flag(2)
2.
Data_rate_flag refers to the M24LR04E-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 28
1
The meaning of flags 5 to 8 is described in Table 29
Bit 4
Protocol_extension_flag(3)
3.
Protocol_extension_flag must always be set to 0.
0
No Protocol format extension



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