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 23 of 137
NXP Semiconductors
PN512
Full NFC Forum-compliant frontend
8.1.1 Register bit behavior
Depending on the functionality of a register, the access conditions to the register can vary.
In principle bits with same behavior are grouped in common registers. In Table 16
the
access conditions are described.
7 VersionReg Shows the version
8 AnalogTestReg Controls the pins AUX1 and AUX2
9 TestDAC1Reg Defines the test value for the TestDAC1
A TestDAC2Reg Defines the test value for the TestDAC2
B TestADCReg Shows the actual value of ADC I and Q
C-F RFT Reserved for production tests
Table 15. PN512 registers overview
…continued
Addr
(hex)
Register Name Function
Table 16. Behavior of register bits and its designation
Abbreviation Behavior Description
r/w read and write These bits can be written and read by the -Controller. Since they
are used only for control means, there content is not influenced by
internal state machines, e.g. the PageSelect-Register may be
written and read by the -Controller. It will also be read by internal
state machines, but never changed by them.
dy dynamic These bits can be written and read by the -Controller.
Nevertheless, they may also be written automatically by internal
state machines, e.g. the Command-Register changes its value
automatically after the execution of the actual command.
r read only These registers hold bits, which value is determined by internal
states only, e.g. the CRCReady bit can not be written from
external but shows internal states.
w write only Reading these registers returns always ZERO.
RFU - These registers are reserved for future use.
In case of a PN512 Version version 2.0 (VersionReg = 82h) a
read access to these registers returns always the value “0”.
Nevertheless this is not guaranteed for future chips versions
where the value is undefined. In case of a write access, it is
recommended to write always the value “0”.
RFT - These registers are reserved for production tests and shall not be
changed.