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MFRC522 Datasheet(PDF) 14 Page - NXP Semiconductors |
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MFRC522 Datasheet(HTML) 14 Page - NXP Semiconductors |
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14 / 109 page  112132 © NXP B.V. 2007. All rights reserved. Product data sheet Rev. 3.2 — 22 May 2007 14 of 109 NXP Semiconductors MFRC522 Contactless Reader IC 9.2.1.3 CommIEnReg Control bits to enable and disable the passing of interrupt requests. Table 9: CommandReg register (address 01h); reset value: 20h Bit 7 6 5 4 3 2 1 0 Symbol - RcvOff Power Down Command Access Rights RFU r/w dy dy Table 10: Description of CommandReg bits Bit Symbol Description 7 to 6 - Reserved for future use. 5 RcvOff Set to logic 1, the analog part of the receiver is switched off. 4 PowerDown Set to logic 1, Soft Power-down mode is entered. Set to logic 0, the MFRC522 starts the wake up procedure. During this procedure this bit still shows a logic 1. A logic 0 indicates that the MFRC522 is ready for operations; see Section 16.2 “Soft Power-down”. Remark: The bit PowerDown cannot be set, when the command SoftReset has been activated. 3 to 0 Command Activates a command according to the Command Code. Reading this register shows which command is actually executed (see Section 18.3 “MFRC522 Commands Overview”). Table 11: CommIEnReg register (address 02h); reset value: 80h Bit 7 6 5 4 3 2 1 0 Symbol IRqInv TxIEn RxIEn IdleIEn HiAlertIEn LoAlertIEn ErrIEn TimerIEn Access Rights r/w r/w r/w r/w r/w r/w r/w r/w Table 12: Description of CommIEnReg bits Bit Symbol Description 7 IRqInv Set to logic 1, the signal on pin IRQ is inverted with respect to bit IRq in the register Status1Reg. Set to logic 0, the signal on pin IRQ is equal to bit IRq. In combination with bit IRqPushPull in register DivIEnReg, the default value of logic 1 ensures, that the output level on pin IRQ is tristate. 6 TxIEn Allows the transmitter interrupt request (indicated by bit TxIRq) to be propagated to pin IRQ. 5 RxIEn Allows the receiver interrupt request (indicated by bit RxIRq) to be propagated to pin IRQ. 4 IdleIEn Allows the idle interrupt request (indicated by bit IdleIRq) to be propagated to pin IRQ. 3 HiAlertIEn Allows the high alert interrupt request (indicated by bit HiAlertIRq) to be propagated to pin IRQ. |
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