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

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Product data sheet

Rev. 5.3 — 3 January 2024

94 / 177

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