MFRC522 datasheet(53/96 Pages) NXP

53 / 96 page

MFRC522_33

Product data sheet

PUBLIC

Rev. 3 — 26 October 2009

112133

53 of 96

NXP Semiconductors

MFRC522

Contactless reader IC

9.3.2.14

MfRxReg register

9.3.2.15

Reserved register 1Eh

Functionality is reserved for future use.

9.3.2.16

SerialSpeedReg register

Selects the speed of the serial UART interface.

Table 79.

MfRxReg register (address 1Dh); reset value: 00h bit allocation

Bit

Symbol

reserved

ParityDisable

reserved

Access

R/W

Table 80.

MfRxReg register bit descriptions

Bit

Symbol

Value Description

7 to 5 reserved

reserved for future use

ParityDisable 1

generation of the parity bit for transmission and the parity check for

receiving is switched off

the received parity bit is handled like a data bit

3 to 0 reserved

reserved for future use

Table 81.

Reserved register (address 1Eh); reset value: 00h bit allocation

Bit

Symbol

reserved

Access

Table 82.

Reserved register bit descriptions

Bit

Symbol

Description

7 to 0

reserved

reserved for future use

Table 83.

SerialSpeedReg register (address 1Fh); reset value: EBh bit allocation

Bit

Symbol

BR_T0[2:0]

BR_T1[4:0]

Access

R/W

Table 84.

SerialSpeedReg register bit descriptions

Bit

Symbol

Description

7 to 5

BR_T0[2:0]

factor BR_T0 adjusts the transfer speed: for description, see

Section 8.1.3.2 on page 11

4 to 0

BR_T1[4:0]

factor BR_T1 adjusts the transfer speed: for description, see

Section 8.1.3.2 on page 11

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