Datasheet

Product data sheet

COMPANY PUBLIC

Rev. 5.2 — 16 June 2016

111352 34 of 137

NXP Semiconductors

PN512

Full NFC Forum-compliant frontend

8.2.1.14 BitFramingReg

Adjustments for bit oriented frames.

Table 43. BitFramingReg register (address 0Dh); reset value: 00h, 00000000b

7 6 5 4 3 2 1 0

StartSend RxAlign 0 TxLastBits

Access

Rights

w r/w r/w r/w RFU r/w r/w r/w

Table 44. Description of BitFramingReg 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 Used for reception of bit oriented frames: RxAlign defines the bit position

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

stored at the following bit positions.

Example:

RxAlign = 0: the LSB of the received bit is stored at bit 0, the second

received bit is stored at bit position 1.

RxAlign = 1: the LSB of the received bit is stored at bit 1, the second

received bit is stored at bit position 2.

RxAlign = 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.

This bit shall only be used for bitwise anticollision at 106 kbit/s in Passive

Communication mode. In all other modes it shall be set to logic 0.

3 - Reserved for future use.

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

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

that all bits of the last byte shall be transmitted.