Texas Instruments TRF7970A Instruction Manual page 59

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6.14.3.2 Control Registers – Sub Level Configuration Registers
6.14.3.2.1 ISO14443 TX Options Register (0x02)
Function: Selects the ISO subsets for ISO14443 – TX
Default: 0x00 at POR = H or EN = L
Bit Name
B7 egt2 TX EGT time select MSB
B6 egt1 TX EGT time select
B5 egt0 TX EGT time select LSB
1 = EOF→ 0 length 11 etu
B4 eof_l0
0 = EOF→ 0 length 10 etu
1 = SOF→ 1 length 03 etu
B3 sof_l1
0 = SOF→ 1 length 02 etu
1 = SOF→ 0 length 11 etu
B2 sof _l0
0 = SOF→ 0 length 10 etu
1 = EGT after each byte
B1 l_egt 0 = EGT after last byte is
omitted
1 = ISO14443A Layer 4
compliant (in SAK
B0 Auto SDD_SAK response)
0 = Not Layer 4 compliant
(in SAK response)
6.14.3.2.2 ISO14443 High-Bit-Rate and Parity Options Register (0x03)
Table 6-30. ISO14443 High-Bit-Rate and Parity Options Register (0x03)
Function: Selects the ISO subsets for ISO14443 – TX
Default: 0x00 at POR = H or EN = L, and at each write to ISO Control register
Bit Name
TX bit rate different from RX
B7 dif_tx_br
bit rate enable
B6 tx_br1
TX bit rate
B5 tx_br0
1 = parity odd except last
B4 parity-2tx
byte which is even for TX
1 = parity odd except last
B3 parity-2rx
byte which is even for RX
B2
B1
B0
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Table 6-29. ISO14443 TX Options Register (0x02)
Function
Three bit code defines the number of etu (0-7) which separate two characters.
ISO14443B TX only.
ISO14443B TX only
For use with Auto SDD configuration, makes B6 in ISO14443A response 1 or 0,
indicating Layer 4 compliance (or not), for all other cases, this bit is unused
Function
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
Unused
Unused
Unused
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SLOS743K – AUGUST 2011 – REVISED APRIL 2014
Description
Description
TRF7970A
TRF7970A
Detailed Description 59