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 57 of 137
NXP Semiconductors
PN512
Full NFC Forum-compliant frontend
8.2.3.9 ModGsPReg
Defines the driver P-output conductance during modulation.
[1] If Force100ASK is set to logic 1, the value of ModGsP has no effect.
8.2.3.10 TMode Register, TPrescaler Register
Defines settings for the timer.
Note: The Prescaler value is split into two 8-bit registers
Table 97. ModGsPReg register (address 29h); reset value: 20h, 00100000b
7 6 5 4 3 2 1 0
00 ModGsP
Access
Rights
RFU RFU r/w r/w r/w r/w r/w r/w
Table 98. Description of ModGsPReg bits
Bit Symbol Description
7 to 6 - Reserved for future use.
5 to 0 ModGsP
[1]
The value of this register defines the conductance of the output
P-driver for the time of modulation. This may be used to regulate the
modulation index.
Note: The conductance value is binary weighted.
Note: During soft Power-down mode the highest bit is forced to 1.
Table 99. TModeReg register (address 2Ah); reset value: 00h, 00000000b
7 6 5 4 3 2 1 0
TAuto TGated TAutoRestart TPrescaler_Hi
Access
Rights
r/w r/w r/w r/w r/w r/w r/w r/w
Table 100. Description of TModeReg bits
Bit Symbol Description
7 TAuto Set to logic 1, the timer starts automatically at the end of the transmission
in all communication modes at all speeds or when bit InitialRFOn is set to
logic 1 and the RF field is switched on.
In mode MIFARE and ISO14443-B 106kbit/s the timer stops after the 5th
bit (1 startbit, 4 databits) if the bit RxMultiple in the register RxModeReg is
not set. In all other modes, the timer stops after the 4th bit if the bit
RxMultiple the register RxModeReg is not set.
If RxMultiple is set to logic 1, the timer never stops. In this case the timer
can be stopped by setting the bit TStopNow in register ControlReg to 1.
Set to logic 0 indicates, that the timer is not influenced by the protocol.