MFRC522 datasheet(50/96 Pages) NXP

50 / 96 page

MFRC522_33

Product data sheet

PUBLIC

Rev. 3 — 26 October 2009

112133

50 of 96

NXP Semiconductors

MFRC522

Contactless reader IC

9.3.2.8

RxSelReg register

Selects internal receiver settings.

3 to 0

MFOutSel

[3:0]

selects the input for pin MFOUT

0000

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

Table 66.

TxSelReg register bit descriptions …continued

Bit

Symbol

Value

Description

Table 67.

RxSelReg register (address 17h); reset value: 84h bit allocation

Bit

Symbol

UARTSel[1:0]

RxWait[5:0]

Access

R/W

Table 68.

RxSelReg register bit descriptions

Bit

Symbol

Value

Description

7 to 6

UARTSel

[1:0]

selects the input of the contactless UART

constant LOW

Manchester with subcarrier from pin MFIN

modulated signal from the internal analog module, default

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

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