Datasheet

Table Of Contents

Product data sheet

COMPANY PUBLIC

Rev. 3.6 — 28 November 2017

115436 155 of 222

NXP Semiconductors

PN532/C1

Near Field Communication (NFC) controller

8.6.23.15 CIU_BitFraming register (EEh or 633Dh)

Adjustments for bit oriented frames.

Table 202. CIU_BitFraming register (address EEh or 633Dh) bit allocation

Bit 7 6 5 4 3 2 1 0

Symbol StartSend RxAlign[2:0] - TxLastBits[2:0]

Reset 0 0000000

Access W R/W R/W R/W R R/W R/W R/W

Table 203. Description of CIU_BitFraming bits

Bit Symbol Description

7 StartSend Set to logic 1, the transmission of data starts.

This bit is only valid in combination with the Transceive command.

6 to 4 RxAlign[2:0] Used for reception of bit oriented frames: RxAlign[2:0] defines the bit

position for the first received bit to be stored in the FIFO. Further

received bits are stored in the following bit positions.

Example:

RxAlign[2:0] = 0: The LSB of the received bit is stored at bit 0, the

second received bit is stored at bit position 1.

RxAlign[2:0] = 1: The LSB of the received bit is stored at bit 1, the

second received bit is stored at bit position 2

RxAlign[2:0] = 7: The LSB of the received bit is stored at bit 7, the

second received bit is stored in the following byte

at bit position 0.

These bits shall only be used for bitwise anticollision at 106 kbit/s in

Passive Communication or Reader/Writer mode. In all other modes it

shall be set to logic 0.

3 - Reserved.

2 to 0 TxLastBits[2:0] Used for transmission of bit oriented frames: TxLastBits defines the

number of bits of the last byte that shall be transmitted. A 000b indicates

that all bits of the last byte shall be transmitted.