MFRC522 datasheet(18/109 Pages) NXP

18 / 109 page

112132

Product data sheet

Rev. 3.2 — 22 May 2007

18 of 109

NXP Semiconductors

MFRC522

Contactless Reader IC

9.2.1.7

ErrorReg

Error bit register showing the error status of the last command executed.

[1]

Command execution will clear all error bits except for bit TempErr. A setting by software is impossible.

Table 19:

ErrorReg register (address 06h); reset value: 00h

Bit

Symbol

WrErr

TempErr

BufferOvfl

CollErr

CRCErr

ParityErr

ProtocolErr

Access

Rights

RFU

Table 20:

Description of ErrorReg bits

Bit

Symbol

Description

WrErr

Set to logic 1, when data is written into the FIFO by the host during the

MFAuthent command or if data is written into the FIFO by the host

during the time between sending the last bit on the RF interface and

receiving the last bit on the RF interface.

TempErr[1]

Set to logic 1, if the internal temperature sensor detects overheating.

In this case, the antenna drivers are switched off automatically.

Reserved for future use.

BufferOvfl

Set to logic 1, if the host or a MFRC522’s internal state machine (e.g.

receiver) tries to write data into the FIFO buffer although the FIFO

buffer is already full.

CollErr

Set to logic 1, if a bit-collision is detected. It is cleared automatically at

receiver start-up phase. This bit is only valid during the bitwise

anticollision at 106 kbit/s. During communication schemes at 212,

424 and 848 kbit/s this bit is always set to logic 0.

CRCErr

Set to logic 1, if bit RxCRCEn in register RxModeReg is set and the

CRC calculation fails. It is cleared to logic 0 automatically at receiver

start-up phase.

ParityErr

Set to logic 1, if the parity check has failed. It is cleared automatically

at receiver start-up phase. Only valid for ISO/IEC 14443A/MIFARE®

communication at 106 kbit/s.

ProtocolErr

Set to logic 1, if one out of the following cases occur:

• Set to logic 1 if the SOF is incorrect. It is cleared automatically at

receiver start-up phase. The bit is only valid for 106 kbit/s.

• During the MFAuthent Command, bit ProtocolErr is set to logic 1,

if the number of bytes received in one data stream is incorrect.

MFRC522 Datasheet(PDF) 18 Page - NXP Semiconductors

MFRC522 Datasheet(HTML) 18 Page - NXP Semiconductors

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

Datasheet Download

Link URL