MFRC63002R datasheet(34/118 Pages) NXP

34 / 118 page

MFRC630

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Product data sheet

COMPANY PUBLIC

Rev. 3.1 — 6 September 2012

227531

34 of 118

NXP Semiconductors

MFRC630

Contactless reader IC

8.6.2.2

Bit generator

The default coding of a data stream is done by using the Bit-Generator. It is activated

when the value of TxFrameCon.DCodeType is set to 0000 (bin). The Bit-Generator

encodes the data stream byte-wise and can apply the following encoding steps to each

data byte.

1. Add a start-bit of specified type at beginning of every byte

2. Add a stop-bit and EGT bits of a specified type. The maximum number of EGT bit is 6,

only full bits are supported

3. Add a parity-bit of a specified type

4. TxFirstBits (skips a given number of bits at the beginning of the first byte in a frame)

5. TxLastBits (skips a given number of bits at the end of the last byte in a frame)

6. Encrypt data-bit (MIFARE encryption)

TxFirstBits and TxLastBits can be used at the same time. If only a single data byte is sent,

it must be ensured that the range of TxFirstBits and TxLastBits do not overlap. It is not

possible to skip more than 8 bit of a single byte! ( (8 - TxFirstBits) + (8 - TxLastBits) ) < 8

By default, data bytes are always treated LSB first. To make use of a MSB first coding, the

TxMSBFirst in the register CLCON1 needs to be set.

8.6.3 Receiver circuitry

8.6.3.1

General

The MFRC630 features a versatile quadrature receiver architecture with fully differential

signal input at RXP and RXN. It can be configured to achieve optimum performance for

reception of various 13.56 MHz based protocols.

For all processing units various adjustments can be made to obtain optimum

performance.

Fig 22. Example 2: overshoot_t1 = 0d; overhoot_t2 = 5d

-1.0

1.0

3.0

5.0

(V)

7.0

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