CLRC663 datasheet(87/177 Pages) NXP

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NXP Semiconductors

CLRC663

High performance multi-protocol NFC frontend CLRC663 and CLRC663 plus

Bit

Access

rights

r/w

Table 145. TxDataNum register (address 2Eh)...continued

Bit

Symbol

Description

7 to 5

RFU

KeepBitGrid

If set, the time between consecutive transmissions starts is a multiple of one ETU. If

cleared, consecutive transmissions can even start within one ETU

DataEn

If cleared - it is possible to send a single symbol pattern.

If set - data is sent.

2 to 0

TxLastBits

Defines how many bits of the last data byte to be sent. If set to 000b, all bits of the last

data byte are sent.

Note - bits are skipped at the end of the byte.

Example - Data byte B2h (sent LSB first).

TxLastBits = 011b (3h) => 010b (LSB first) is sent

TxLastBits = 110b (6h) => 010011b (LSB first) is sent

Table 146. TxDataNum bits

9.10.2 TxDATAModWidth

Transmitter data modulation width register

Bit

Symbol

DModWidth

Access

rights

r/w

Table 147. TxDataModWidth register (address 2Fh)

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

are also used for the modulation width of start and/or stop symbols.

Table 148. TxDataModWidth bits

9.10.3 TxSym10BurstLen

If a protocol requires a burst (an unmodulated subcarrier) the length can be defined with this TxSymBurstLen,

the value high or low can be defined by TxSym10BurstCtrl.

Bit

Symbol

RFU

Sym1Burst Len

RFU

Sym0Burst Len

Table 149. TxSym10BurstLen register (address 30h)

CLRC663

All information provided in this document is subject to legal disclaimers.

Product data sheet

Rev. 5.3 — 3 January 2024

87 / 177

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