MFRC63002R datasheet(67/118 Pages) NXP

67 / 118 page

MFRC630

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Product data sheet

COMPANY PUBLIC

Rev. 3.1 — 6 September 2012

227531

67 of 118

NXP Semiconductors

MFRC630

Contactless reader IC

9.6.4 RxColl

Receiver collision register.

Table 65.

RxColl register (address 0Dh);

Bit

Symbol

CollPosValid

CollPos

Access

rights

Table 66.

RxColl bits

Bit

Symbol

Description

CollPos

Valid

If set to 1, the value of CollPos is valid. Otherwise no collision is detected or

the position of the collision is out of the range of bits CollPos.

6 to 0

CollPos

These bits show the bit position of the first detected collision in a received

frame (only data bits are interpreted). CollPos can only be displayed for the

first 8 bytes of a data stream.

Example:

00h indicates a bit collision in the 1st bit

01h indicates a bit collision in the 2nd bit

08h indicates a bit collision in the 9th bit (1st bit of 2nd byte)

3Fh indicates a bit collision in the 64th bit (8th bit of the 8th byte)

These bits shall only be interpreted in Passive communication mode at 106

kbit/s or ISO/IEC 14443A/MIFARE reader /writer mode if bit CollPosValid is

set.

Note: If RxBitCtrl.RxAlign is set to a value different to 0, this value is included

in the CollPos.

Example: RxAlign = 4h, a collision occurs in the 4th received bit (which is the

last bit of that UID byte). The CollPos = 7h in this case.

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