Texas Instruments TRF7960 Manual page 27

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5.3.2 Control Registers – Sub Level Configuration Registers
Selects the ISO subsets for ISO14443B – TX
Register default is set to 0x00 at POR = H or EN = L
Bit Bit Name Function
B7 egt2 TX EGT time select MSB
B6 egt1 TX EGT time select
B5 egt0 TX EGT time select LSB
B4 eof_l0 1 = EOF,
0 = EOF,
B3 sof_l1 1 = SOF,
0 = SOF,
B2 sof _l0 1 = SOF,
0 = SOF,
B1 l_egt 1 = EGT after each byte
0 = EGT after last byte is omitted
B0 Unused
Parity
Register default is set to 0x00 at POR = H, or EN = L and at each write to ISO control register
Bit Bit Name Function
B7 dif_tx_br TX bit rate different than 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
Register default is set to 0xC2 at POR = H or EN = L and at each write to ISO control register
Bit Bit Name Function
B7 Tm_st1 Timer start condition
B6 Tm_st0 Timer start condition
B5 Tm_lengthD Timer length MSB
B4 Tm_lengthC Timer length
B3 Tm_lengthB Timer length
B2 Tm_lengthA Timer length
B1 Tm_length9 Timer length
B0 Tm_length8 Timer length LSB
Copyright © 2006–2010, Texas Instruments Incorporated
Table 5-12. ISO14443B TX Options (02h)
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 5-13. ISO 14443A High-Bit-Rate Options (03h)
Table 5-14. TX Timer H-Byte (04h)
Comments
tm_st1 = 0, tm_st0 = 0
tm_st1 = 0, tm_st0 = 1
tm_st1 = 1, tm_st0 = 0
tm_st1 = 1, tm_st0 = 1
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Comments
Three bit code defines the number of etu (0-7) which
separate two characters. ISO14443B TX only
ISO14443B TX only
Comments
Valid for ISO14443A/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 14443A high bit rate, coding and decoding
beginning of TX SOF
end of TX SOF
beginning of RX SOF
end of RX SOF
TRF7960
TRF7961
System Description 27