MFRC522 datasheet(48/96 Pages) NXP

48 / 96 page

MFRC522_33

Product data sheet

PUBLIC

Rev. 3 — 26 October 2009

112133

48 of 96

NXP Semiconductors

MFRC522

Contactless reader IC

9.3.2.5

TxControlReg register

Controls the logical behavior of the antenna driver pins TX1 and TX2.

RxMultiple

receiver is deactivated after receiving a data frame

able to receive more than one data frame

only valid for data rates above 106 kBd in order to handle the

polling command

after setting this bit the Receive and Transceive commands will

not terminate automatically. Multiple reception can only be

deactivated by writing any command (except the Receive

command) to the CommandReg register, or by the host clearing

the bit

if set to logic 1, an error byte is added to the FIFO buffer at the

end of a received data stream which is a copy of the ErrorReg

1 to 0

reserved

reserved for future use

Table 60.

RxModeReg register bit descriptions …continued

Bit

Symbol

Value

Description

Table 61.

TxControlReg register (address 14h); reset value: 80h bit allocation

Bit

Symbol

InvTx2RF

InvTx1RF

InvTx2RF

Off

InvTx1RF

Off

Tx2CW reserved Tx2RFEn Tx1RFEn

Access

R/W

Table 62.

TxControlReg register bit descriptions

Bit Symbol

Value Description

InvTx2RFOn 1

output signal on pin TX2 inverted when driver TX2 is enabled

InvTx1RFOn 1

output signal on pin TX1 inverted when driver TX1 is enabled

InvTx2RFOff 1

output signal on pin TX2 inverted when driver TX2 is disabled

InvTx1RFOff 1

output signal on pin TX1 inverted when driver TX1 is disabled

Tx2CW

output signal on pin TX2 continuously delivers the unmodulated

13.56 MHz energy carrier

Tx2CW bit is enabled to modulate the 13.56 MHz energy carrier

reserved

reserved for future use

Tx2RFEn

output signal on pin TX2 delivers the 13.56 MHz energy carrier

modulated by the transmission data

Tx1RFEn

output signal on pin TX1 delivers the 13.56 MHz energy carrier

modulated by the transmission data

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