CLRC663 datasheet(94/177 Pages) NXP

94 / 177 page

NXP Semiconductors

CLRC663

High performance multi-protocol NFC frontend CLRC663 and CLRC663 plus

9.13 Clock configuration

9.13.1 SerialSpeed

This register allows setting speed of the RS232 interface. The default speed is set to 115.2 kbit/s. The

transmission speed of the interface can be changed by modifying the entries for BR_T0 and BR_T1. The

transfer speed can be calculated by using the following formulas:

BR_T0 = 0: transfer speed = 27.12 MHz / (BR_T1 + 1)

BR_T0 > 0: transfer speed = 27.12 MHz / (BR_T1 + 33) / 2^(BR_T0 - 1)

The framing is implemented with 1 start bit, 8 data bits and 1 stop bit. A parity bit is not used. Transfer speeds

above 1228.8 kbit/s are not supported.

Bit

Symbol

BR_T0

BR_T1

Access

rights

r/w

Table 170. SerialSpeed register (address3Bh); reset value: 7Ah

Bit

Symbol

Description

7 to 5

BR_T0

BR_T0 = 0: transfer speed = 27.12 MHz / (BR_T1 + 1)

BR_T0 > 0: transfer speed = 27.12 MHz / (BR_T1 + 33) / 2^(BR_T0 - 1)

4 to 0

BR_T1

BR_T0 = 0: transfer speed = 27.12 MHz / (BR_T1 + 1)

BR_T0 > 0: transfer speed = 27.12 MHz / (BR_T1 + 33) / 2^(BR_T0 - 1)

Table 171. SerialSpeed bits

Transfer speed (kbit/s)

SerialSpeed register content (Hex.)

7.2

9.6

14.4

19.2

38.4

57.6

115.2

128.0

230.4

460.8

921.6

1228.8

Table 172. RS232 speed settings

CLRC663

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

Product data sheet

Rev. 5.3 — 3 January 2024

94 / 177

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