M24LR64E-R Datasheet, PDF (68/140 Pages) STMicroelectronics – 64-Kbit EEPROM with password protection, dual interface & energy harvesting: 400 kHz I²C bus & ISO 15693 RF protocol at 13.56 MHz

Request format
19 Request format
M24LR64E-R
The request consists of:
● an SOF,
● flags,
● a command code,
● parameters and data,
● a CRC,
● an EOF.
Table 26. General request format
S
O Request_flags
F
Command code
Parameters
Data
E
CRC O
F
19.1
Request flags
In a request, the “flags” field specifies the actions to be performed by the M24LR64E-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
M24LR64E-R selection criteria. When bit 3 is set (1), bits 5 to 8 define the M24LR64E-R
Inventory parameters.
Table 27. Definition of request flags 1 to 4
Bit No
Flag
Level
Description
Bit 1 Subcarrier_flag⁽¹⁾
Bit 2 Data_rate_flag⁽²⁾
Bit 3 Inventory_flag
Bit 4 Protocol_extension_flag⁽³⁾
0
A single subcarrier frequency is used by the
M24LR64E-R
1 Two subcarriers are used by the M24LR64E-R
0 Low data rate is used
1 High data rate is used
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
0 No Protocol format extension
1 Protocol format extension
1. Subcarrier_flag refers to the M24LR64E-R-to-VCD communication.
2. Data_rate_flag refers to the M24LR64E-R-to-VCD communication.
3. Protocol_extension_flag must be set to 1 for Read Single Block, Read Multiple Block, Fast Read Multiple
Block, Write Single Block, and Get Multiple Block Security Status commands. Get System Info command
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.
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Doc ID 022712 Rev 3