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17: UARTs
172 GP4020 GPS Baseband Processor Design Manual
Baud Rate
Required
Division
Select
Value
Reference
Clock (MHz)
Baud Rate
Ratio
Prog.
BRR
Value
Programmed
Baud Rate
Baud Rate
Error (%)
1200 8 3.125 161.76042 162 1198.236 0.147
2400 4 6.25 161.76042 162 2396.472 0.147
4800 2 12.5 161.76042 162 4792.945 0.147
9600 1 25 161.76042 162 9585.89 0.147
19200 1 25 80.380208 80 19290.12 -0.469
38400 1 25 39.690104 40 38109.76 0.756
57600 1 25 26.126736 26 57870.37 -0.469
76800 1 25 19.345052 19 78125 -1.725
115200 1 25 12.563368 13 111607.1 3.119
Table 17.5 UART baud-rate settings with UART_CLK (BµILD_CLK) frequency = 25MHz
Baud Rate
Required
Division
Select
Value
Reference
Clock (MHz)
Baud Rate
Ratio
Prog.
BRR
Value
Programmed
Baud Rate
Baud Rate
Error (%)
1200 8 3.28125 169.89844 170 1199.287 0.059
2400 4 6.5625 169.89844 170 2398.575 0.059
4800 2 13.125 169.89844 170 4797.149 0.059
9600 1 26.25 169.89844 170 9594.298 0.059
19200 1 26.25 84.449219 84 19301.47 -0.528
38400 1 26.25 41.724609 42 38154.07 0.64
57600 1 26.25 27.483073 27 58593.75 -1.725
76800 1 26.25 20.362305 20 78125 -1.725
115200 1 26.25 13.241536 13 117187.5 -1.725
Table 17.6 UART baud-rate settings with UART_CLK (BµILD_CLK) frequency = 26.25MHz
Baud Rate
Required
Division
Select
Value
Reference
Clock (MHz)
Baud Rate
Ratio
Prog.
BRR
Value
Programmed
Baud Rate
Baud Rate
Error (%)
1200 8 3.4375 178.03646 178 1200.244 -0.02
2400 4 6.875 178.03646 178 2400.489 -0.02
4800 2 13.75 178.03646 178 4800.978 -0.02
9600 1 27.5 178.03646 178 9601.955 -0.02
19200 1 27.5 88.518229 89 19097.22 0.535
38400 1 27.5 43.759115 44 38194.44 0.535
57600 1 27.5 28.83941 29 57291.67 0.535
76800 1 27.5 21.379557 21 78125 -1.725
115200 1 27.5 13.919705 14 114583.3 0.535
Table 17.7 UART baud-rate settings with UART_CLK (BµILD_CLK) frequency = 27.5MHz