RC522 datasheet(10/109 Pages) NXP

10 / 109 page

112132

Product data sheet

Rev. 3.2 — 22 May 2007

10 of 109

NXP Semiconductors

MFRC522

Contactless Reader IC

The contactless UART of MFRC522 and a dedicated external host are required to handle

the complete MIFARE® / ISO/IEC 14443A / MIFARE® protocol. The following Figure 6

“Data Coding and framing according to ISO/IEC 14443A.” shows the Data Coding and

framing according to ISO/IEC 14443A / MIFARE®.

The internal CRC co-processor calculates the CRC value according to the definitions

given in the ISO/IEC 14443A part 3 and handles parity generation internally according to

the transfer speed. Automatic parity generation can be switched off by bit ParityDisable in

Card

→ Reader

(MFRC522

receives data from

a card)

modulation

on card side

subcarrier

load

modulation

subcarrier

load

modulation

subcarrier

load

modulation

subcarrier

load

modulation

subcarrier

frequency

13.56 MHz/16

13.56MHz/16 13.56MHz/16 13.56MHz/16

bit coding

Manchester

coding

BPSK

Table 4:

Communication overview for ISO/IEC 14443A/MIFARE® reader/writer …continued

Communication

direction

ISO/IEC 14443A/ MIFARE®

transfer

speed

106 kbit/s

212 kbit/s

424 kbit/s

848 kbit/s

Fig 6.

Data Coding and framing according to ISO/IEC 14443A.

Start

odd

Par

8 bit data

odd

Par

8 bit data

odd

Par

8 bit data

Start Bit is "1"

ISO14443-A Framing at 106 kbit/s

Start

odd

Par

8 bit data

odd

Par

8 bit data

even

Par.

8 bit data

Start Bit is "0"

Burst of

32 sub-

carrier

clocks

Even parity at the

end of the frame!

ISO14443-A Framing at 212, 424 and 848 kbit/s

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