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ST25R3911B Datasheet(PDF) 59 Page - STMicroelectronics

Part # ST25R3911B
Description  High performance HF reader / NFC initiator with 1.4 W supporting VHBR and AAT
PDF  116 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

ST25R3911B Datasheet(HTML) 59 Page - STMicroelectronics

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1.3.5
Bit rate definition register
Address: 04h
Type: RW
Table 25. Bit rate definition register
Bit
Name
Default
Function
Comments(1)(2)
7
tx_rate3
0
Refer to Table 26
Selects bit rate for Tx
6
tx_rate2
0
5
tx_rate1
0
4
tx_rate0
0
3
rx_rate3
0
Selects bit rate for Rx in case selected protocol allows different bit rates for Rx and
Tx
2
rx_rate2
0
1
rx_rate1
0
0
rx_rate0
0
1. Default setting takes place at power-up and after set default command.
2. Automatically loaded by direct command go to normal NFC mode.
Table 26. Bit rate coding
rate3
rate2
rate1
rate0
Bit rate (kbit/s)
Comments(1)
0
0
0
0
fc/128 (~106)
-
0
0
0
1
fc/64 (~212)
-
0
0
1
0
fc/32 (~424)
-
0
0
1
1
fc/16 (~848)
-
0
1
0
0
fc/16 (~1695)
VHBR Tx is supported only for ISO14443B mode
VHBR Rx is supported only for fc/4
0
1
0
1
fc/16 (~3390)
0
1
1
0
fc/16 (~6780)
Other combinations
-
Not used
1. If a non supported bit rate is selected the Tx/Rx operation is disabled.
ST25R3911B
Registers
DS11793 - Rev 6
page 59/116



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