m24lr16e-r STMicroelectronics, m24lr16e-r Datasheet - Page 69

• Manufacturer Part Number: m24lr16e-r
• Description: 16 Kbit Eeprom With Password Protection, Dual Interface & Energy Harvesting 400 Khz I²c Bus & Iso 15693 Rf Protocol At 13.56 Mhz
• Manufacturer: STMicroelectronics

M24LR16E
19
19.1
Request format
The request consists of:
●
●
●
●
●
●
Table 26.
Request flags
In a request, the “flags” field specifies the actions to be performed by the M24LR16E-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
M24LR16E-R selection criteria. When bit 3 is set (1), bits 5 to 8 define the M24LR16E-R
Inventory parameters.
Table 27.
1. Subcarrier_flag refers to the M24LR16E-R-to-VCD communication.
2. Data_rate_flag refers to the M24LR16E-R-to-VCD communication.
3. Protocol_extension_flag must be set to 1 for commands: Read Single Block, Read Multiple Block, Fast
S
O
Bit No
F
Bit 1
Bit 2
Bit 3
Bit 4
Read Multiple Block, Write Single Block, Get Multiple Block Security Status. Command Get System Info
supports two options: a standard response format when Protocol_extension_flag is set to 0, and a rich
response when protocol extension is set to 1.
an SOF,
flags,
a command code,
parameters and data,
a CRC,
an EOF.
Request_flags
Subcarrier_flag
Data_rate_flag
Inventory_flag
Protocol_extension_flag
General request format
Definition of request flags 1 to 4
Flag
(2)
(1)
Command code
Doc ID 018932 Rev 7
(3)
Level
0
1
0
1
0
1
0
1
A single subcarrier frequency is used by the
M24LR16E-R
Two subcarrier are used by the M24LR16E-R
Low data rate is used
High data rate is used
The meaning of flags 5 to 8 is described in
The meaning of flags 5 to 8 is described in
No Protocol format extension
Protocol format extension
Parameters
Description
Data
Request format
Table 28
Table 29
CRC
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