MFRC522 datasheet(55/96 Pages) NXP

55 / 96 page

MFRC522_33

Product data sheet

PUBLIC

Rev. 3 — 26 October 2009

112133

55 of 96

NXP Semiconductors

MFRC522

Contactless reader IC

9.3.3.3

Reserved register 23h

Functionality is reserved for future use.

9.3.3.4

ModWidthReg register

Sets the modulation width.

9.3.3.5

Reserved register 25h

Functionality is reserved for future use.

Table 91.

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

Bit

Symbol

reserved

Access

Table 92.

Reserved register bit descriptions

Bit

Symbol

Description

7 to 0

reserved

reserved for future use

Table 93.

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

Bit

Symbol

ModWidth[7:0]

Access

R/W

Table 94.

ModWidthReg register bit descriptions

Bit

Symbol

Description

7 to 0

ModWidth[7:0] deﬁnes the width of the Miller modulation as multiples of the carrier

frequency (ModWidth + 1 / fclk)

the maximum value is half the bit period

Table 95.

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

Bit

Symbol

reserved

Access

Table 96.

Reserved register bit descriptions

Bit

Symbol

Description

7 to 0

reserved

reserved for future use

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