ST95HF datasheet(21/93 Pages) STMICROELECTRONICS

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ST95HF

Commands

5.4

Protocol Select command (0x02) description

This command selects the RF communication protocol and prepares the ST95HF for

communication with a reader or 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 ST95HF 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.

Table 11. PROTOCOLSELECT command description

Direction

Data

Comments

Example

Host to

ST95HF

0x02

Command code

See Table 12: List of <Parameters>

values for the ProtocolSelect command

for different protocols (Reader) on

page 22.

See Table 13: List of <Parameters>

values for different protocols (Card

Emulation) on page 25.

<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

: ST Reserved

(ISO/IEC 14443-B

under qualification)

: ST Reserved

(ISO/IEC 18092 under

qualification)

Each protocol has a

different set of

parameters. See

Table 12.

ST95HF to

Host

0x00

Result code

<<<0x0000

Protocol is successfully selected

0x00

Length of data

ST95HF to

Host

0x82

Error code

<<<0x8200

Invalid command length

0x00

Length of data

ST95HF to

Host

0x83

Error code

<<<0x8300

Invalid protocol

0x00

Length of data

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