ST95HF datasheet(17/93 Pages) STMICROELECTRONICS

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ST95HF

Communication protocols

Caution:

SPI communication is MSB first.

4.1.2

Interrupt mode

When the ST95HF is configure to use the SPI serial interface, pin IRQ_OUT is used to give

additional information to user. When the ST95HF is ready to send back a reply, it sends an

Interrupt Request by setting a low level on pin IRQ_OUT, which remains low until the host

reads the data.

The application can use the Interrupt mode to skip the polling stage.

Caution:

SPI communication is MSB first.

4.2

Error codes

Table 6. Possible error codes and their meaning

Code

Name

Meaning

0x80

EFrameRecvOK

Frame correctly received (additionally see CRC/Parity information)

0x85

EUserStop

Stopped by user (used only in Card mode)

0x86

ECommError

Hardware communication error

0x87

EFrameWaitTOut

Frame wait time out (no valid reception)

0x88

EInvalidSof

Invalid SOF

0x89

EBufOverflow

Too many bytes received and data still arriving

0x8A

EFramingError

if start bit = 1 or stop bit = 0

0x8B

EEgtError

EGT time out

0x8C

EInvalidLen

Valid for ISO/IEC 18092, if Length <3

0x8D

ECrcError

CRC error, Valid only for ISO/IEC 18092

0x8E

ERecvLost

When reception is lost without EOF received (or subcarrier was lost)

0x8F

ENoField

When Listen command detects the absence of external field

0x90

EUnintByte

Residual bits in last byte. Useful for ACK/NAK reception of ISO/IEC 14443 Type A.

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