Texas Instruments TRF7960 Manual page 25

www.ti.com
6.4.2 Control Registers – Sublevel Configuration Registers
Table 6-14 describes the ISO14443B TX Options register. This register selects the ISO subsets for
ISO/IEC 14443 B transmit. The register default is 0x00 and is reset at POR = H or EN = L.
Table 6-14. ISO14443B TX Options Register (Address = 02h)
BIT BIT NAME FUNCTION
B7 egt2 TX EGT time select MSB
B6 egt1 TX EGT time select
B5 egt0 TX EGT time select LSB
1 = EOF,
B4 eof_l0
0 = EOF,
1 = SOF,
B3 sof_l1
0 = SOF,
1 = SOF,
B2 sof _l0
0 = SOF,
1 = EGT after each byte
B1 l_egt
0 = EGT after last byte is omitted
B0 Unused
Table 6-15 describes the ISO14443A High-Bit-Rate Options register. The register default is 0x00 and is
rest at POR = H or EN = L and at each write to the ISO Control register.
Table 6-15. ISO14443A High-Bit-Rate Options Register (Address = 03h)
BIT BIT NAME FUNCTION
B7 dif_tx_br TX bit rate different from RX bit rate enable
B6 tx_br1
TX bit rate
B5 tx_br0
B4 parity-2tx 1 = Parity odd except last byte, which is even for TX
B3 parity-2rx 1 = Parity odd except last byte, which is even for RX
B2 Unused
B1 Unused
B0 Unused
Table 6-16 describes the TX Timer H-Byte register. The register default is 0xC2 and is reset at POR = H
or EN = L and at each write to the ISO Control register.
BIT BIT NAME FUNCTION
B7 Tm_st1
Timer start condition
B6 Tm_st0
B5 Tm_lengthD
B4 Tm_lengthC
B3 Tm_lengthB
Timer length. MSB is B5.
B2 Tm_lengthA
B1 Tm_length9
B0 Tm_length8
Copyright © 2006–2017, Texas Instruments Incorporated
0 length 11 etu
0 length 10 etu
1 length 03 etu
1 length 02 etu
0 length 11 etu
0 length 10 etu
Table 6-16. TX Timer H-Byte Register (Address = 04h)
Submit Documentation Feedback
Product Folder Links:
SLOU186G – AUGUST 2006 – REVISED MAY 2017
COMMENTS
This 3-bit code defines the number of etu (0 to 7) that
separate two characters. ISO/IEC 14443 B TX only.
ISO/IEC 14443 B TX only
COMMENTS
Valid for ISO/IEC 14443 A or B high bit rate
tx_br1 = 0, tx_br = 0: 106 kbps
tx_br1 = 0, tx_br = 1: 212 kbps
tx_br1 = 1, tx_br = 0: 424 kbps
tx_br1 = 1, tx_br = 1: 848 kbps
For ISO/IEC 14443 A high bit rate, coding and decoding
COMMENTS
tm_st1 = 0, tm_st0 = 0: Beginning of TX SOF
tm_st1 = 0, tm_st0 = 1: End of TX SOF
tm_st1 = 1, tm_st0 = 0: Beginning of RX SOF
tm_st1 = 1, tm_st0 = 1: End of RX SOF
TRF7960 TRF7961
TRF7960, TRF7961
Detailed Description 25