TRF7970A
www.ti.com
SLOS743K – AUGUST 2011 – REVISED APRIL 2014
The main register controlling the digital part of the receiver is the ISO Control register (address 0x01). By
writing to this register, the user selects the protocol to be used. At the same time (with each new write in
this register) the default preset in all related registers is done, so no further adjustments in other registers
are needed for proper operation. Table 6-6 shows the coding of the ISO Control register (0x01).
Table 6-6. Coding of the ISO Control Register
Bit
B7
Signal Name
rx_crc_n
Function
Receiving without CRC
1 = No RX CRC
Comments
0 = RX CRC
B6
dir_mode
Direct mode type
0 = output is subcarrier data
1 = output is bit stream and clock from decoder selected by ISO bits
B5
rfid
RFID mode
0 = RFID reader mode
1 = NFC or Card Emulator mode
RFID: Mode selection
B4
iso_4
RFID protocol, NFC target
NFC:
0 = NFC target
1 = NFC initiator
RFID: Mode selection (see Table 6-7 )
B3
iso_3
RFID protocol, NFC mode
NFC:
0 = passive mode
1 = active mode
RFID: Mode selection
B2
iso_2
RFID protocol, Card Emulation
NFC:
0 = NFC normal modes
1 = Card Emulation mode
B1
iso_1
RFID protocol, NFC bit rate
RFID: Mode selection
NFC: Bit rate selection or Card Emulation selection (see Table 6-8 )
B0
iso_0
RFID protocol, NFC bit rate
RFID: Mode selection
NFC: Bit rate selection or Card Emulation selection (see Table 6-8 )
Table 6-7. Coding of the ISO Control Register For RFID Mode (B5 = 0)
Iso_4
0
0
0
0
0
0
0
0
0
Iso_3
0
0
0
0
0
0
0
0
1
Iso_2
0
0
0
0
1
1
1
1
0
Iso_1
0
0
1
1
0
0
1
1
0
Iso_0
0
1
0
1
0
1
0
1
0
Protocol
ISO15693 low bit rate, one subcarrier, 1 out of 4
ISO15693 low bit rate, one subcarrier, 1 out of 256
ISO15693 high bit rate, one subcarrier, 1 out of 4
ISO15693 high bit rate, one subcarrier, 1 out of 256
ISO15693 low bit rate, double subcarrier, 1 out of 4
ISO15693 low bit rate, double subcarrier, 1 out of 256
ISO15693 high bit rate, double subcarrier, 1 out of 4
ISO15693 high bit rate, double subcarrier, 1 out of 256
ISO14443A, bit rate 106 kbps
Remarks
Default for RFID IC
RX bit rate when TX rate
0
1
0
0
1
ISO14443 A high bit rate 212 kbps
different from RX rate (see
register 0x03)
Copyright ? 2011–2014, Texas Instruments Incorporated
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