MFRC52201HN1/TRAYB NXP [NXP Semiconductors], MFRC52201HN1/TRAYB Datasheet - Page 11

• Manufacturer Part Number: MFRC52201HN1/TRAYB
• Description: Contactless reader IC
• Manufacturer: NXP [NXP Semiconductors]

NXP Semiconductors
MFRC522_33
Product data sheet
PUBLIC
8.1.3.2 Selectable UART transfer speeds
The internal UART interface is compatible with an RS232 serial interface.
The default transfer speed is 9.6 kBd. To change the transfer speed, the host controller
must write a value for the new transfer speed to the SerialSpeedReg register. Bits
BR_T0[2:0] and BR_T1[4:0] define the factors for setting the transfer speed in the
SerialSpeedReg register.
The BR_T0[2:0] and BR_T1[4:0] settings are described in
transfer speeds and the relevant register settings are given in
Table 9.
Table 10.
[1]
The selectable transfer speeds shown in
following equations:
If BR_T0[2:0] = 0:
If BR_T0[2:0] > 0:
Remark: Transfer speeds above 1228.8 kBd are not supported.
transfer speed
transfer speed
BR_Tn
BR_T0 factor
BR_T1 range
Transfer speed (kBd)
7.2
9.6
14.4
19.2
38.4
57.6
115.2
128
230.4
460.8
921.6
1228.8
The resulting transfer speed error is less than 1.5 % for all described transfer speeds.
BR_T0 and BR_T1 settings
Selectable UART transfer speeds
=
=
Bit 0
1
1 to 32 33 to 64 33 to 64 33 to 64 33 to 64 33 to 64 33 to 64 33 to 64
--------------------------------
27.12 10
BR_T 0
----------------------------------- -
-----------------------------------
BR_T 1
27.12 10
2
Rev. 3 — 26 October 2009
BR_T 0 1
Bit 1
1
+
+
1
–
6
SerialSpeedReg value
Decimal
250
235
218
203
171
154
122
116
90
58
28
21
33
112133
6
Bit 2
2
Table 10
Bit 3
4
Hexadecimal
FAh
EBh
DAh
CBh
ABh
9Ah
7Ah
74h
5Ah
3Ah
1Ch
15h
are calculated according to the
Bit 4
8
Table
Transfer speed accuracy
(%)
0.32
0.32
0.32
1.45
0.32
Table
0.25
0.25
0.25
0.25
0.06
0.25
0.25
Bit 5
16
[1]
9. Examples of different
Contactless reader IC
10.
MFRC522
© NXP B.V. 2009. All rights reserved.
Bit 6
32
Bit 7
64
11 of 96
(1)
(2)