AN3985 datasheet(68/105 Pages) STMICROELECTRONICS

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M24LRxx layer

AN3985

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Doc ID 022255 Rev 2

7.2.3

Request flags and CR95HF_ProtocolSelect functions

The CR95HF_ProtocolSelect function (defined into CR95HF layer) selects the RF protocol

and defines, for a CR95HF device, the datarate and contactless tag response format (single

or double subcarrier). Once the protocol and the RF parameters are configured, the

CR95HF is able to decode only contactless tag responses with same format and datarate.

The datarate and contactless tag response format are also defined in the request flag byte

of each command. The user application must ensure that the datarate and subcarrier flags

match the CR95HF_ProtocolSelect function parameters. This check is performed by the

ISO/IEC 15693 layer functions. If the parameters do not match, the functions are not

executed and the corresponding commands are not sent to the CR95HF.

7.3

M24LRxx commands

M24LRxx devices are based on ISO/IEC 15693 specification. Thus the M24LRxx functions

call the ISO/IEC 15693 functions. Furthermore the M24LRxx functions carry out some

additional checks and modify some parameter as defined in the M24LRxx datasheet.

Table 115 shows the relationship between M24LRxx and ISO/IEC 15693 layer. The "function

name" column presents the M24LRxx functions.

The next column gives the ISO15593 layer functions called. If the functions does not exist in

the ISO/IEC 15693 layer, the "New function" idiom is display.

Table 115.

Relationship between M24LRxx and ISO/IEC 15693 layer

Function name

New or equivalent

function

Brief description

M24LRxx_Inventory

ISO15693_Inventory

M24LRxx_Stay_Quiet

ISO15693_Stay_Quiet

M24LRxx_Read_Single_Block

New function

Sends a ReadSingleBlock

command

M24LRxx_Write_Single_Block

New function

Sends a WriteSingleBlock

command

M24LRxx_Read_Multiple_Block

New function

Sends a ReadMultipleBlock

command

M24LRxx_Select

ISO15693_Select

M24LRxx_Reset_to_Ready

ISO15693_Reset_to_R

eady

M24LRxx_Write_AFI

ISO15693_Write_AFI

M24LRxx_Lock_AFI

ISO15693_Lock_AFI

M24LRxx_Write_DSFID

ISO15693_Write_DSFI

M24LRxx_Lock_DSFID

ISO15693_Lock_DSFID

M24LRxx_Get_System_Info

New functions

Sends a GetSystemInfo

command

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