UBR Settings at Various Crystal Frequencies
Baud Rate | 1 MHz | %Error | 1.84 MHz | %Error | 2 MHz | %Error | 2.458 MHz | %Error |
2400 | UBR = 25 | 0.2 | UBR = 47 | 0.0 | UBR = 51 | 0.2 | UBR = 63 | 0.0 |
4800 | UBR = 12 | 0.2 | UBR = 23 | 0.0 | UBR = 25 | 0.2 | UBR = 31 | 0.0 |
9600 | UBR = 6 | 7.5 | UBR = 11 | 0.0 | UBR = 12 | 0.2 | UBR = 15 | 0.0 |
14400 | UBR = 3 | 7.8 | UBR = 7 | 0.0 | UBR = 8 | 3.7 | UBR = 10 | 3.1 |
19200 | UBR = 2 | 7.8 | UBR = 5 | 0.0 | UBR = 6 | 7.5 | UBR = 7 | 0.0 |
28800 | UBR = 1 | 7.8 | UBR = 3 | 0.0 | UBR = 3 | 7.8 | UBR = 4 | 6.3 |
38400 | UBR = 1 | 22.9 | UBR = 2 | 0.0 | UBR = 2 | 7.8 | UBR = 3 | 0.0 |
57600 | UBR = 0 | 7.8 | UBR = 1 | 0.0 | UBR = 1 | 7.8 | UBR = 2 | 12.5 |
76800 | UBR = 0 | 22.9 | UBR = 1 | 33.3 | UBR = 1 | 22.9 | UBR = 1 | 0.0 |
115200 | UBR = 0 | 84.3 | UBR = 0 | 0.0 | UBR = 0 | 7.8 | UBR = 0 | 25.0 |
Baud Rate | 3.28 MHz | %Error | 3.69 MHz | %Error | 4 MHz | %Error | 4.608 MHz | %Error |
2400 | UBR = 84 | 0.4 | UBR = 95 | 0.0 |
UBR =103 |
0.2 |
UBR =119 |
0.0 |
4800 | UBR = 42 | 0.8 | UBR = 47 | 0.0 | UBR = 51 | 0.2 | UBR = 59 | 0.0 |
9600 |
UBR = 20 |
1.6 | UBR = 23 | 0.0 | UBR = 25 | 0.2 | UBR = 29 | 0.0 |
14400 | UBR = 13 | 1.6 | UBR = 15 | 0.0 | UBR = 16 | 2.1 | UBR = 19 | 0.0 |
19200 |
UBR = 10 |
3.1 | UBR = 11 | 0.0 | UBR = 12 | 0.2 | UBR = 14 | 0.0 |
28800 | UBR = 6 | 1.6 | UBR = 7 | 0.0 | UBR = 8 | 3.7 | UBR = 9 | 0.0 |
38400 | UBR = 4 | 6.3 | UBR = 5 | 0.0 | UBR = 6 | 7.5 | UBR = 7 | 6.7 |
57600 | UBR = 3 | 12.5 | UBR = 3 | 0.0 | UBR = 3 | 7.8 | UBR = 4 | 0.0 |
76800 | UBR = 2 | 12.5 | UBR = 2 | 0.0 | UBR = 2 | 7.8 | UBR = 3 | 6.7 |
115200 | UBR = 1 | 12.5 | UBR = 1 | 0.0 | UBR = 1 | 7.8 | UBR = 2 | 20.0 |
Baud Rate | 7.37 MHz | %Error | 8 MHz | %Error | ||||
2400 |
UBR =191 |
0.0 |
UBR =207 |
0.2 | ||||
4800 | UBR = 95 | 0.0 |
UBR =103 |
0.2 | ||||
9600 | UBR = 47 | 0.0 | UBR = 51 | 0.2 | ||||
14400 | UBR = 31 | 0.0 | UBR = 34 | 0.8 | ||||
19200 | UBR = 23 | 0.0 | UBR = 25 | 0.2 | ||||
28800 | UBR = 15 | 0.0 | UBR = 16 | 2.1 | ||||
38400 | UBR = 11 | 0.0 | UBR = 12 | 0.2 | ||||
57600 | UBR = 7 | 0.0 | UBR = 8 | 3.7 | ||||
76800 | UBR = 5 | 0.0 | UBR = 6 | 7.5 | ||||
115200 | UBR = 3 | 0.0 | UBR = 3 | 7.8 |