MFRC522 datasheet(24/109 Pages) NXP

24 / 109 page

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Product data sheet

Rev. 3.2 — 22 May 2007

24 of 109

NXP Semiconductors

MFRC522

Contactless Reader IC

9.2.1.16

Reserved

Functionality is reserved for further use.

9.2.2 Page 1: Communication

9.2.2.1

Reserved

Functionality is reserved for further use.

4 to 0

CollPos

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

received frame. Only data bits are interpreted.

Example:

00h

indicates a bit collision in the 32nd bit

01h

indicates a bit collision in the 1st bit

08h

indicates a bit collision in the 8th bit

These bits shall only be interpreted if bit CollPosNotValid is set to

logic 0.

Table 36:

Description of CollReg bits

Bit

Symbol

Description

Table 37:

Reserved register (address 0Fh); reset value: 00h

Bit

Symbol

Access

Rights

RFU

Table 38:

Description of Reserved register bits

Bit

Symbol

Description

7 to 0

Reserved for future use.

Table 39:

Reserved register (address 10h); reset value: 00h

Bit

Symbol

Access

Rights

RFU

Table 40:

Description of Reserved register bits

Bit

Symbol

Description

7 to 0

Reserved for future use.

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