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 31 of 137
NXP Semiconductors
PN512
Full NFC Forum-compliant frontend
8.2.1.9 Status2Reg
Contains status bits of the Receiver, Transmitter and Data mode detector.
Table 33. Status2Reg register (address 08h); reset value: 00h, 00000000b
7 6 5 4 3 2 1 0
TempSensClear I
2
CForceHS 0 TargetActivated MFCrypto1On Modem State
Access
Rights
r/w r/w RFU dy dy r r r
Table 34. Description of Status2Reg bits
Bit Symbol Description
7 TempSensClear Set to logic 1, this bit clears the temperature error, if the temperature
is below the alarm limit of 125 C.
6I
2
CForceHS I
2
C input filter settings. Set to logic 1, the I
2
C input filter is set to the
High-speed mode independent of the I
2
C protocol. Set to logic 0, the
I
2
C input filter is set to the used I
2
C protocol.
5 - Reserved for future use.
4 TargetActivated Set to logic 1 if the Select command or if the Polling command was
answered. Note: This bit can only be set during the AutoColl
command in Passive Communication mode.
Note: This bit is cleared automatically by switching off the external
RF field.
3 MFCrypto1On This bit indicates that the MIFARE Crypto1 unit is switched on and
therefore all data communication with the card is encrypted.
This bit can only be set to logic 1 by a successful execution of the
MFAuthent Command. This bit is only valid in Reader/Writer mode
for MIFARE cards. This bit shall be cleared by software.
2 to 0 Modem State ModemState shows the state of the transmitter and receiver state
machines.
Value Description
000 IDLE
001 Wait for StartSend in register BitFramingReg
010 TxWait: Wait until RF field is present, if the bit TxWaitRF is
set to logic 1. The minimum time for TxWait is defined by the
TxWaitReg register.
011 Sending
100 RxWait: Wait until RF field is present, if the bit RxWaitRF is
set to logic 1. The minimum time for RxWait is defined by the
RxWait in the RxSelReg register.
101 Wait for data
110 Receiving