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MFRC522 Datasheet(PDF) 29 Page - NXP Semiconductors |
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MFRC522 Datasheet(HTML) 29 Page - NXP Semiconductors |
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29 / 109 page  112132 © NXP B.V. 2007. All rights reserved. Product data sheet Rev. 3.2 — 22 May 2007 29 of 109 NXP Semiconductors MFRC522 Contactless Reader IC 9.2.2.8 RxSelReg Selects internal receiver settings. 3 to 0 MFOutSel Selects the input for the MFOUT Pin. Value Description 0000 Tristate 0001 Low 0010 High 0011 TestBus signal as defined by bit TestBusBitSel in register TestSel1Reg. 0100 Modulation signal (envelope) from the internal coder, Miller Puls Coded 0101 Serial data stream to be transmitted, data stream before Miller Coder 0110 Reserved 0111 Serial data stream received, data stream after Manchester Decoder 1000-1111 Reserved Table 52: Description of TxSelReg bits Bit Symbol Description Table 53: RxSelReg register (address 17h); reset value: 84h Bit 7 6 5 4 3 2 1 0 Symbol UartSel RxWait Access Rights r/w r/w Table 54: Description of RxSelReg bits Bit Symbol Description 7 to 6 UartSel Selects the input of the contactless UART Value Description 00 Constant Low 01 Manchester with sub-carrier from MFIN pin 10 Modulation signal from the internal analog part, default 11 NRZ coding without sub-carrier from MFIN pin. Only valid for transfer speeds above 106 kbit/s. 5 to 0 RxWait After data transmission, the activation of the receiver is delayed for RxWait bit-clocks. During this ‘frame guard time’ any signal at pin Rx is ignored.This parameter is ignored by the receive command. All other commands (e.g. Transceive, MFAuthent) use this parameter. The counter starts immediately after the external RF field is switched on. |
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