CLRC663 datasheet(21/132 Pages) NXP

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CLRC663

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Product data sheet

COMPANY PUBLIC

Rev. 3.3 — 3 April 2012

171133

21 of 132

NXP Semiconductors

CLRC663

Contactless reader IC

Remark: To send more bytes in one data stream the NSS signal must be LOW during the

send process. To send more than one data stream the NSS signal must be HIGH between

each data stream.

8.4.3 RS232 interface

8.4.3.1

Selection of the transfer speeds

The internal UART interface is compatible to a RS232 serial interface.

Table 20 “Selectable transfer speeds” describes examples for different transfer speeds

and relevant register settings. The resulting transfer speed error is less than 1.5 % for all

described transfer speeds. The default transfer speed is 115.2 kbit/s.

To change the transfer speed, the host controller has to write a value for the new transfer

speed to the register SerialSpeedReg. The bits BR_T0 and BR_T1 define factors to set

the transfer speed in the SerialSpeedReg.

Table 19 “Settings of BR_T0 and BR_T1” describes the settings of BR_T0 and BR_T1.

Fig 13. Connection to host with SPI

001aaj641

tSCKL

tNSSH

tSCKH

tSCKL

th(SCKL-Q)

tsu(D-SCKH)

th(SCKH-D)

th(SCKL-Q)

t(SCKL-NSSH)

SCK

MOSI

MISO

MSB

LSB

NSS

Table 19.

Settings of BR_T0 and BR_T1

BR_T0

01234567

factor BR_T0

1124816

range BR_T1

1 to 32

33 to 64

Table 20.

Selectable transfer speeds

Transfer speed (kbit/s)

Serial SpeedReg

Transfer speed accuracy (%)

(Hex.)

7.2

0.25

9.6

0.32

14.4

0.25

19.2

0.32

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