Microchip Technology dsPIC30F - Page 473

© 2004 Microchip Technology Inc. DS70066C-page 19-9
Section 19. UART
UART
19
19.3.1 Baud Rate Tables
UART baud rates are provided in Table 19-1 for common device instruction cycle frequencies
(F
CY). The minimum and maximum baud rates for each frequency are also shown.
Table 19-1: UART Baud Rates
BAUD
RATE
(Kbps)
F
CY = 30 MHz
BRG
value
(decimal)
25 MHz
BRG
value
(decimal)
20 MHz
BRG
value
(decimal)
16 MHz
BRG
value
(decimal)
KBAUD
%
ERROR KBAUD
%
ERROR KBAUD
%
ERROR KBAUD
%
ERROR
0.3 0.3 0.0 6249 0.3 +0.01 5207 0.3 0.0 4166 0.3 +0.01 3332
1.2 1.1996 0.0 1562 1.2001 +0.01 1301 1.1996 0.0 1041 1.2005 +0.04 832
2.4 2.4008 0.0 780 2.4002 +0.01 650 2.3992 0.0 520 2.3981 -0.08 416
9.6 9.6154 +0.2 194 9.5859 -0.15 162 9.6154 +0.2 129 9.6154 +0.16 103
19.2 19.1327 -0.4 97 19.2901 0.47 80 19.2308 +0.2 64 19.2308 +0.16 51
38.4 38.2653 -0.4 48 38.1098 -0.76 40 37.8788 -1.4 32 38.4615 +0.16 25
56 56.8182 +1.5 32 55.8036 -0.35 27 56.8182 +1.5 21 55.5556 -0.79 17
115 117.1875 +1.9 15 111.6071 -2.95 13 113.6364 -1.2 10 111.1111 -3.38 8
250 250 0.0 4 250 0.0 3
500 500 0.0 1
MIN. 0.0286 0.0 65535 0.0238 0.0 65535 0.019 0.0 65535 0.015 0.0 65535
MAX. 1875 0.0 0 1562.5 0.0 0 1250 0.0 0 1000 0.0 0
BAUD
RATE
(Kbps)
F
CY = 12 MHz
BRG
value
(decimal)
10 MHz
BRG
value
(decimal)
8 MHz
BRG
value
(decimal)
7.68 MHz
BRG
value
(decimal)
KBAUD
%
ERROR KBAUD
%
ERROR KBAUD
%
ERROR KBAUD
%
ERROR
0.3 0.3 0.0 2499 0.3 0.0 2082 0.2999 -0.02 1666 0.3 0.0 1599
1.2 1.2 0.0 624 1.1996 0.0 520 1.199 -0.08 416 1.2
0.0 399
2.4 2.3962 -0.2 312 2.4038 +0.2 259 2.4038 +0.16 207 2.4
0.0 199
9.6 9.6154 -0.2 77 9.6154 +0.2 64 9.6154 +0.16 51 9.6
0.0 49
19.2 19.2308 +0.2 38 18.9394 -1.4 32 19.2308 +0.16 25 19.2
0.0 24
38.4 37.5 +0.2 19 39.0625 +1.7 15 38.4615 +0.16 12
56 57.6923 -2.3 12 56.8182 +1.5 10 55.5556 -0.79 8
115 6
250 250 0.0 2 250 0.0 1
500 500 0.0 0
MIN. 0.011 0.0 65535 0.010 0.0 65535 0.008 0.0 65535 0.007 0.0 65535
MAX. 750 0.0 0 625 0.0 0 500 0.0 0 480 0.0 0
BAUD
RATE
(Kbps)
F
CY = 5 MHz
BRG
value
(decimal)
4 MHz
BRG
value
(decimal)
3.072 MHz
BRG
value
(decimal)
1.8432 MHz
BRG
value
(decimal)
KBAUD
%
ERROR KBAUD
%
ERROR KBAUD
%
ERROR KBAUD
%
ERROR
0.3 0.2999 0.0 1041 0.3001 0.0 832 0.3
0.0
639 0.3
0.0
383
1.2 1.2019 +0.2 259 1.2019 +0.2 207 1.2
0.0
159 1.2
0.0
95
2.4 2.4038 +0.2 129 2.4038 +0.2 103 2.4
0.0
79 2.4
0.0
47
9.6 9.4697 -1.4 32 9.6154 +0.2 25 9.6
0.0
19 9.6
0.0
11
19.2 19.5313 +1.7 15 19.2308 +0.2 12 19.2
0.0
9 19.2
0.0
5
38.4 39.0625 +1.7 7 38.4 0.0 4 38.4 0.0 2
56
115
250
500
MIN. 0.005 0.0 65535 0.004 0.0 65535 0.003 0.0 65535 0.002 0.0 65535
MAX. 312.5 0.0 0 250 0.0 0 192 0.0 0 115.2 0.0 0