MFRC522 datasheet(34/109 Pages) NXP

34 / 109 page

112132

Product data sheet

Rev. 3.2 — 22 May 2007

34 of 109

NXP Semiconductors

MFRC522

Contactless Reader IC

9.2.3.3

Reserved

Functionality is reserved for further use.

9.2.3.4

ModWidthReg

Controls the setting of modulation width.

9.2.3.5

Reserved

Functionality is reserved for further use.

Table 77:

Reserved register (address 23h); reset value: 88h

Bit

Symbol

Access

Rights

RFU

Table 78:

Description of Reserved register bits

Bit

Symbol

Description

7 to 0

Reserved for future use.

Table 79:

ModWidthReg register (address 24h); reset value: 26h

Bit

Symbol

ModWidth

Access

Rights

r/w

Table 80:

Description of ModWidthReg bits

Bit

Symbol

Description

7 to 0

ModWidth

These bits define the width of the Miller modulation as multiples of the

carrier frequency (ModWidth +1/fc). The maximum value is half the bit

period.

Table 81:

Reserved register (address 25h); reset value: 87h

Bit

Symbol

Access

Rights

RFU

Table 82:

Description of Reserved register bits

Bit

Symbol

Description

7 to 0

Reserved for future use.

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