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RC522 Datasheet(PDF) 42 Page - NXP Semiconductors |
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RC522 Datasheet(HTML) 42 Page - NXP Semiconductors |
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42 / 109 page  112132 © NXP B.V. 2007. All rights reserved. Product data sheet Rev. 3.2 — 22 May 2007 42 of 109 NXP Semiconductors MFRC522 Contactless Reader IC 9.2.4.6 TestBusReg Shows the status of the internal testbus. 9.2.4.7 AutoTestReg Controls the digital selftest. 9.2.4.8 VersionReg Shows the version. Table 113: TestBusReg register (address 35h); reset value: XXh Bit 7 6 5 4 3 2 1 0 Symbol TestBus Access Rights r Table 114: Description of TestBusReg bits Bit Symbol Description 7 to 0 TestBus Shows the status of the internal test bus. The test bus is selected by the register TestSel2Reg. See Section 19 “Testsignals”. Table 115: AutoTestReg register (address 36h); reset value: 40h Bit 7 6 5 4 3 2 1 0 Symbol - AmpRcv - SelfTest Access Rights RFU r/w RFT r/w Table 116: Description of AutoTestReg bits Bit Symbol Description 7 - Reserved for production tests. 6 AmpRcv If set to logic 1, the internal signal processing in the receiver chain is performed non-linear. This increases the operating distance in communication modes at 106 kbit/s. Remark: Due to the non linearity the effect of the bits MinLevel and CollLevel in the register RxThreshholdReg are as well non linear. 5 to 4 - Reserved for production tests. 3 to 0 SelfTest Enables the digital self test. The selftest can be started by the selftest command in the command register. The selftest is enabled by 1001b. Remark: For default operation the selftest has to be disabled by 0000b. Table 117: VersionReg register (address 37h); reset value: XXh Bit 7 6 5 4 3 2 1 0 Symbol Version Access Rights r Table 118: Description of VersionReg bits Bit Symbol Description 7 to 0 Version Indicates current version. Remark: The current version for MFRC522 is 90h or 91h. |
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