MFRC522 datasheet(44/96 Pages) NXP

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MFRC522_33

Product data sheet

PUBLIC

Rev. 3 — 26 October 2009

112133

44 of 96

NXP Semiconductors

MFRC522

Contactless reader IC

9.3.1.14

BitFramingReg register

Adjustments for bit-oriented frames.

9.3.1.15

CollReg register

Deﬁnes the ﬁrst bit-collision detected on the RF interface.

Table 47.

BitFramingReg register (address 0Dh); reset value: 00h bit allocation

Bit

Symbol

StartSend

RxAlign[2:0]

reserved

TxLastBits[2:0]

Access

R/W

Table 48.

BitFramingReg register bit descriptions

Bit

Symbol

Value Description

StartSend

starts the transmission of data

only valid in combination with the Transceive command

6 to 4

RxAlign[2:0]

used for reception of bit-oriented frames: deﬁnes the bit

position for the ﬁrst bit received to be stored in the FIFO buffer

example:

LSB of the received bit is stored at bit position 0, the second

received bit is stored at bit position 1

LSB of the received bit is stored at bit position 1, the second

received bit is stored at bit position 2

LSB of the received bit is stored at bit position 7, the second

received bit is stored in the next byte that follows at bit

position 0

These bits are only to be used for bitwise anticollision at

106 kBd, for all other modes they are set to 0

reserved

reserved for future use

2 to 0

TxLastBits[2:0]

used for transmission of bit oriented frames: deﬁnes the

number of bits of the last byte that will be transmitted

000b indicates that all bits of the last byte will be transmitted

Table 49.

CollReg register (address 0Eh); reset value: xxh bit allocation

Bit

Symbol

ValuesAfterColl

reserved

CollPosNotValid

CollPos[4:0]

Access

R/W

Table 50.

CollReg register bit descriptions

Bit

Symbol

Value Description

ValuesAfterColl

all received bits will be cleared after a collision

only used during bitwise anticollision at 106 kBd,

otherwise it is set to logic 1

reserved

reserved for future use

CollPosNotValid

no collision detected or the position of the collision is

out of the range of CollPos[4:0]

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