MFRC522 datasheet(27/109 Pages) NXP

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112132

Product data sheet

Rev. 3.2 — 22 May 2007

27 of 109

NXP Semiconductors

MFRC522

Contactless Reader IC

9.2.2.5

TxControlReg

Controls the logical behavior of the antenna driver pins Tx1 and Tx2.

RxNoErr

If set to logic 1, a not valid received data stream (less than 4 bits

received) will be ignored. The receiver will remain active.

RxMultiple

Set to logic 0, the receiver is deactivated after receiving a data frame.

Set to logic 1, it is possible to receive more than one data frame. This bit

is only valid for data rates above 106 kbit/s to handle the Polling

command. Having set this bit, the receive and transceive commands will

not terminate automatically. In this case the multiple receiving can only

be deactivated by writing any command (except the Receive command)

to the CommandReg register or by clearing the bit by the host.

If set to logic 1, at the end of a received data stream an error byte is

added to the FIFO. The error byte is a copy of the ErrorReg register.

1 to 0

Reserved for future use.

Table 46:

Description of RxModeReg bits …continued

Bit

Symbol

Description

Table 47:

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

Bit

Symbol

InvTx2RF

InvTx1RF

InvTx2RF

Off

InvTx1RF

Off

Tx2CW

Tx2RFEn

Tx1RFEn

Access

Rights

r/w

RFU

r/w

Table 48:

Description of TxControlReg bits

Bit

Symbol

Description

InvTx2RFOn

Set to logic 1, the output signal at pin TX2 will be inverted, if driver TX2

is enabled.

InvTx1RFOn

Set to logic 1, the output signal at pin TX1 will be inverted, if driver TX1

is enabled.

InvTx2RFOff

Set to logic 1, the output signal at pin TX2 will be inverted, if driver TX2

is disabled.

InvTx1RFOff

Set to logic 1, the output signal at pin TX1 will be inverted, if driver TX1

is disabled.

Tx2CW

Set to logic 1, the output signal on pin TX2 will deliver continuously the

un-modulated 13.56 MHz energy carrier.

Set to logic 0, Tx2CW is enabled to modulate the 13.56 MHz energy

carrier.

Reserved for future use.

Tx2RFEn

Set to logic 1, the output signal on pin TX2 will deliver the 13.56 MHz

energy carrier modulated by the transmission data.

Tx1RFEn

Set to logic 1, the output signal on pin TX1 will deliver the 13.56 MHz

energy carrier modulated by the transmission data.

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