STRFNFCA datasheet(17/74 Pages) STMICROELECTRONICS

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STRFNFCA

Commands

Doc ID 023077 Rev 10

17/74

5.4

Protocol Select command (0x02) description

This command selects the RF communication protocol and prepares the STRFNFCA for

communication with a contactless tag.

Note that there is no ‘Field ON’ command. When the application selects an RF

communication protocol, the field automatically switches ON if the Reader state is selected.

When the application selects a protocol, the STRFNFCA performs all necessary settings: it

will choose the appropriate reception and transmission chains, switch ON or OFF the RF

field and connect the antenna accordingly.

Different protocols have different sets of parameters. Values for the <Parameters> field

are listed in Table 9.

Table 8.

PROTOCOLSELECT

command description

Direction

Data

Comments

Example

Host to

STRFNFCA

0x02

Command code

See Table 9: List of <Parameters>

values for the ProtocolSelect command

for different protocols (Reader) on

page 18.

See Table 10: List of <Parameters>

values for different protocols (Card

Emulation) on page 21.

<Len>

Length of data

Protocol codes (Reader):

: Field OFF

: ISO/IEC 15693

: ISO/IEC 14443-A /

NFC Forum Tag Type

1, Type 2, Type 4A

: ISO/IEC 14443-B /

NFC Forum Tag

Type 4B

: ISO/IEC 18092 /

NFC Forum Tag

Type 3

-------------------------------

Protocol codes (Card

Emulation):

: ISO/IEC 14443-A

: ISO/IEC 14443-B

: ISO/IEC 18092

Each protocol has a

different set of

parameters. See Table 9.

STRFNFCA

to Host

0x00

Result code

<<<0x0000

Protocol is successfully selected

0x00

Length of data

STRFNFCA

to Host

0x82

Error code

<<<0x8200

Invalid command length

0x00

Length of data

STRFNFCA

to Host

0x83

Error code

<<<0x8300

Invalid protocol

0x00

Length of data

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