ST95HF datasheet(30/93 Pages) STMICROELECTRONICS

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Commands

ST95HF

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Figure 11. Data transfer (in both command and response) when Parity Framing mode

is enabled

ISO/IEC

18092

NFC

Forum Tag

Type 3

Send example

00FFFF0000

Example of an ISO/IEC 18092 / NFC

Forum Type 3 request sequence:

>>>0x040500FFFF0000 (REQC)

<<<0x801201010102148E0DB41310

0B4B428485D0FF00 (ATQC)

Command code

Length of entire data field

Data

1. For more information on using split frames, refer to Appendix D on page 69.

2. If Parity Framing mode is used (Bit 4 of transmission flag byte is set to ‘1’), then the parity bit must be

coded inside the data for each byte to be sent using the send/receive command in Transmit mode, and is

not decoded by the ST95HF in Receive mode. In Receive mode, each data byte is accompanied by an

additional byte which encodes the parity: <data byte> <parity byte> <data byte > ...

Examples of data received by send / receive in Parity Framing mode:

80 05 32 80 34 00 00

meaning: if the ST95HF received 2 data bytes:

0x32 with parity = ‘1’ (0x80) and 0x34 with parity = ‘0’ (0x0) in Parity Framing mode. For more details,

see NFC Forum Tag Type 2 on page 75.

The Parity Framing mode is compatible with MIFARE® Classic requirements. However, access to

Authenticated state must be supported by the external secure host which embeds the MIFARE® Classic

library.

Table 18. List of <Data> Response values for the SENDRECV command for different

protocols

Protocol Explanation

Response example

Comments

ISO/IEC

15693

Response

example

80 08

0000000000

77CF

This is a response to Read

Single Block command for

ISO/IEC 15693 TAG. Actual

TAG response is

<<<0x000000000077CF,

other fields are added by the

ST95HF.

Result code

Length of entire data

field

Data received from tag

Original (received) value of CRC

[7:2]: RFU

1: CRC error if set

0: Collision is detected if set

Table 17. List of <Data> Send values for the SENDRECV command for different

protocols (continued)

Protocol

Explanation

Command example

Comments

Bytes

X X X X X X X X

2nd CRC

Data Byte

sent or

P 0 0 0 0 0 0 0

Parity Byte

.... .... ....

P 0 0 0 0 0 0 0

2nd CRC Byte

Parity Byte

received

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