Datasheet
PN512 All information provided in this document is subject to legal disclaimers. © NXP Semiconductors N.V. 2016. All rights reserved.
Product data sheet
COMPANY PUBLIC
Rev. 5.2 — 16 June 2016
111352 50 of 137
NXP Semiconductors
PN512
Full NFC Forum-compliant frontend
8.2.2.15 TypeBReg
8.2.2.16 SerialSpeedReg
Selects the speed of the serial UART interface.
Table 75. TypeBReg register (address 1Eh); reset value: 00h, 00000000b
7 6 5 4 3 2 1 0
RxSOF
Req
RxEOF
Req
0EOFSOF
Width
NoTxSOF NoTxEOF TxEGT
Access
Rights
r/w r/w RFU r/w r/w r/w r/w r/w
Table 76. Description of TypeBReg bits
Bit Symbol Description
7 RxSOFReq If this bit is set to logic 1, the SOF is required. A datastream starting
without SOF is ignored.
If this bit is cleared, a datastream with and without SOF is accepted.
The SOF will be removed and not written into the FIFO.
6 RxEOFReq If this bit is set to logic 1, the EOF is required. A datastream ending
without EOF will generate a Protocol-Error. If this bit is cleared, a
datastream with and without EOF is accepted. The EOF will be
removed and not written into the FIFO.
For the behaviour in version 1.0, see Section 20 “
Errata sheet” on
page 109.
5 - Reserved for future use.
4 EOFSOFWidth If this bit is set to logic 1 and EOFSOFAdjust bit is logic 0, the SOF
and EOF will have the maximum length defined in ISO/IEC 14443B.
If this bit is cleared and EOFSOFAdjust bit is logic 0, the SOF and
EOF will have the minimum length defined in ISO/IEC 14443B.
If this bit is set to 1 and the EOFSOFadjust bit is logic 1 will result in
SOF low = (11etu 8 cycles)/fc
SOF high = (2 etu + 8 cycles)/fc
EOF low = (11 etu 8 cycles)/fc
If this bit is set to 0 and the EOFSOFAdjust bit is logic 1 will result in
an incorrect system behavior in respect to ISO specification.
For the behaviour in version 1.0, see Section 20 “
Errata sheet” on
page 109.
3 NoTxSOF If this bit is set to logic 1, the generation of the SOF is suppressed.
2 NoTxEOF If this bit is set to logic 1, the generation of the EOF is suppressed.
1 to 0 TxEGT These bits define the length of the EGT.
Value Description
00 0 bit
01 1 bit
10 2 bits
11 3 bits