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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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MFRC522 датащи(PDF) 46 Page - NXP Semiconductors |
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MFRC522 датащи(HTML) 46 Page - NXP Semiconductors |
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46 / 96 page  MFRC522_33 © NXP B.V. 2009. All rights reserved. Product data sheet PUBLIC Rev. 3 — 26 October 2009 112133 46 of 96 NXP Semiconductors MFRC522 Contactless reader IC 9.3.2.2 ModeReg register Defines general mode settings for transmitting and receiving. 9.3.2.3 TxModeReg register Defines the data rate during transmission. Table 55. ModeReg register (address 11h); reset value: 3Fh bit allocation Bit 7 6 5 4 3 2 1 0 Symbol MSBFirst reserved TxWaitRF reserved PolMFin reserved CRCPreset[1:0] Access R/W - R/W - R/W - R/W Table 56. ModeReg register bit descriptions Bit Symbol Value Description 7 MSBFirst 1 CRC coprocessor calculates the CRC with MSB first in the CRCResultReg register the values for the CRCResultMSB[7:0] bits and the CRCResultLSB[7:0] bits are bit reversed Remark: during RF communication this bit is ignored 6 reserved - reserved for future use 5 TxWaitRF 1 transmitter can only be started if an RF field is generated 4 reserved - reserved for future use 3 PolMFin defines the polarity of pin MFIN Remark: the internal envelope signal is encoded active LOW, changing this bit generates a MFinActIRq event 1 polarity of pin MFIN is active HIGH 0 polarity of pin MFIN is active LOW 2 reserved - reserved for future use 1 to 0 CRCPreset [1:0] defines the preset value for the CRC coprocessor for the CalcCRC command Remark: during any communication, the preset values are selected automatically according to the definition of bits in the RxModeReg and TxModeReg registers 00 0000h 01 6363h 10 A671h 11 FFFFh Table 57. TxModeReg register (address 12h); reset value: 00h bit allocation Bit 7 6 5 4 3 2 1 0 Symbol TxCRCEn TxSpeed[2:0] InvMod reserved Access R/W D R/W - |
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