MFRC522_09 Datasheet, PDF (50/96 Pages) NXP Semiconductors – Contactless reader IC

NXP Semiconductors
MFRC522
Contactless reader IC
Table 66. TxSelReg register bit descriptions …continued
Bit Symbol Value
Description
3 to 0 MFOutSel
[3:0]
0000
selects the input for pin MFOUT
3-state
0001
LOW
0010
HIGH
0011
test bus signal as defined by the TestSel1Reg register’s
TstBusBitSel[2:0] value
0100
modulation signal (envelope) from the internal encoder, Miller
pulse encoded
0101
serial data stream to be transmitted, data stream before Miller
encoder
0110
reserved
0111
serial data stream received, data stream after Manchester
decoder
1000 to
1111
reserved
9.3.2.8 RxSelReg register
Selects internal receiver settings.
Table 67. RxSelReg register (address 17h); reset value: 84h bit allocation
Bit
7
6
5
4
3
2
1
0
Symbol
UARTSel[1:0]
RxWait[5:0]
Access
R/W
R/W
Table 68. RxSelReg register bit descriptions
Bit Symbol Value Description
7 to 6 UARTSel
[1:0]
00
selects the input of the contactless UART
constant LOW
01
Manchester with subcarrier from pin MFIN
10
modulated signal from the internal analog module, default
11
NRZ coding without subcarrier from pin MFIN which is only valid
for transfer speeds above 106 kBd
5 to 0 RxWait -
[5:0]
after data transmission the activation of the receiver is delayed for
RxWait bit-clocks, during this ‘frame guard time’ any signal on pin RX
is ignored
this parameter is ignored by the Receive command
all other commands, such as Transceive, MFAuthent use this
parameter
the counter starts immediately after the external RF field is switched
on
MFRC522_33
Product data sheet
PUBLIC
Rev. 3 — 26 October 2009
112133
© NXP B.V. 2009. All rights reserved.
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