MFRC522 datasheet(49/96 Pages) NXP

49 / 96 page

MFRC522_33

Product data sheet

PUBLIC

Rev. 3 — 26 October 2009

112133

49 of 96

NXP Semiconductors

MFRC522

Contactless reader IC

9.3.2.6

TxASKReg register

Controls transmit modulation settings.

9.3.2.7

TxSelReg register

Selects the internal sources for the analog module.

Table 63.

TxASKReg register (address 15h); reset value: 00h bit allocation

Bit

Symbol

reserved Force100ASK

reserved

Access

R/W

Table 64.

TxASKReg register bit descriptions

Bit

Symbol

Value Description

reserved

reserved for future use

Force100ASK 1

forces a 100 % ASK modulation independent of the ModGsPReg

5 to 0 reserved

reserved for future use

Table 65.

TxSelReg register (address 16h); reset value: 10h bit allocation

Bit

Symbol:

reserved

DriverSel[1:0]

MFOutSel[3:0]

Access:

R/W

Table 66.

TxSelReg register bit descriptions

Bit

Symbol

Value

Description

7 to 6

reserved

reserved for future use

5 to 4

DriverSel

[1:0]

selects the input of drivers TX1 and TX2

3-state; in soft power-down the drivers are only in 3-state

mode if the DriverSel[1:0] value is set to 3-state mode

modulation signal (envelope) from the internal encoder, Miller

pulse encoded

modulation signal (envelope) from pin MIFIN

HIGH; the HIGH level depends on the setting of bits

InvTx1RFOn/InvTx1RFOff and InvTx2RFOn/InvTx2RFOff

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