MFRC63002R datasheet(90/118 Pages) NXP

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MFRC630

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Product data sheet

COMPANY PUBLIC

Rev. 3.1 — 6 September 2012

227531

90 of 118

NXP Semiconductors

MFRC630

Contactless reader IC

9.13 Clock configuration

9.13.1 SerialSpeed

This register allows to set speed of the RS232 interface. The default speed is set to

9,6kbit/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 startbit, 8 databits and 1 stop bit. A parity bit is not

used. Transfer speeds above 1228,8 kbit/s are not supported.

Table 157. Effect of gain and highpass corner register settings

rcv_gain

(Hex.)

rcv_hpcf

(Hex.)

fl (kHz)

fU (MHz)

gain (dB20)

bandwith

(MHz)

2,3

2,4

2,3

150

2,6

2,5

264

2,9

2,6

2,3

2,4

2,3

157

2,6

2,4

272

3,0

2,7

2,6

2,7

2,6

157

2,9

2,7

273

3,3

3,0

2,6

2,7

2,6

159

2,9

2,7

276

3,4

3,1

Table 158. SerialSpeed register (address3Bh); reset value: 7Ah

Bit

Symbol

BR_T0

BR_T1

Access

rights

r/w

Table 159. SerialSpeed bits

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)

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