ST25R3920 datasheet(78/152 Pages) STMICROELECTRONICS

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Application information

ST25R3920

78/152

DS13261 Rev 9

4.5.11

Auxiliary definition register

Address: 0Ah

Type: RW

Table 34. Auxiliary definition register

Bit

Name

Default

Function

Comments

no_crc_rx

0: Receive with CRC check

1: Receive without CRC check

Valid for all protocols, for ISO14443A REQA,

WUPA and anticollision receive without CRC is

done automatically(1).

6RFU

nfc_id1

00: 4 bytes NFCID1

01: 7 bytes NFCID1

1x: RFU

Selects NFCID1 size.

4nfc_id0

mfaz_cl90

0: 0° shifted clock for phase

measurement

1: 90° shifted clock for phase

measurement

Affects also PM demodulation.

Should be set to 0 for PM demodulation.

dis_corr

Refer to Table 35

Selects RW receiver operation.

1nfc_n1

Value of n for direct commands NFC Initial Field

ON and NFC Response Field ON (0...3)(2).

0nfc_n0

1. Receive without CRC is done automatically when REQA and WUPA commands are sent using, respectively, direct

commands Transmit REQA and Transmit WUPA, and in case anticollision is performed setting bit antcl.

2. The value of nfc_n<1:0> must be set prior to the NFC Initial Field ON and NFC Response Field ON operations.

Table 35. RW receiver operation

Mode

dis_corr = 0

dis_corr = 1

ISO-A (106 to 848 kHz)

Correlator reception

ISO-B (106 to 848 kHz)

Pulse reception (coherent)

Felica™ (212 to 424 kHz)

Pulse reception

NFC Forum Type 1 Tag (Topaz)

Stream modes

(scf<1:0> = 01, scp<1:0> = 11)

Pulse reception

Stream modes - Others

Pulse reception

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