Product data

MFRC631 All information provided in this document is subject to legal disclaimers. © NXP B.V. 2014. All rights reserved.
Product data sheet
COMPANY PUBLIC
Rev. 3.3 — 4 February 2014
227433 85 of 120
NXP Semiconductors
MFRC631
High performance ISO/IEC 14443 A/B reader solution
9.10.2 TxDATAModWidth
Transmitter data modulation width register
Table 137. TxDataModWidth register (address 2Fh)
Bit 7 6 5 4 3 2 1 0
Symbol DModWidth
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r/w
Table 138. TxDataModWidth bits
Bit Symbol Description
7 to 0 DModWidth Specifies the length of a pulse for sending data with enabled pulse
modulation. The length is given by the number of carrier clocks + 1.
A pulse can never be longer than from the start of the pulse to the end
of the bit. The starting position of a pulse is given by the setting of
TxDataMod.DPulseType. Note: This register is only used if Miller
modulation (ISO/IEC 14443A PCD) is used. The settings are also
used for the modulation width of start and/or stop symbols.