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17: UARTs
GP4020 GPS Baseband Processor Design Manual 171
Baud Rate
Required
Division
Select
Value
Reference
Clock (MHz)
Baud Rate
Ratio
Prog.
BRR
Value
Programmed
Baud Rate
Baud Rate
Error (%)
1200 8 2.65625 137.34635 137 1203.012 -0.251
2400 4 5.3125 137.34635 137 2406.024 -0.251
4800 2 10.625 137.34635 137 4812.047 -0.251
9600 1 21.25 137.34635 137 9624.094 -0.251
19200 1 21.25 68.173177 68 19248.19 -0.251
38400 1 21.25 33.586589 34 37946.43 1.181
57600 1 21.25 22.057726 22 57744.57 -0.251
76800 1 21.25 16.293294 16 78125 -1.725
115200 1 21.25 10.528863 11 110677.1 3.926
Table 17.2 UART baud-rate settings with UART_CLK (BµILD_CLK) frequency = 21.25MHz
Baud Rate
Required
Division
Select
Value
Reference
Clock (MHz)
Baud Rate
Ratio
Prog.
BRR
Value
Programmed
Baud Rate
Baud Rate
Error (%)
1200 8 2.8125 145.48438 145 1203.981 -0.332
2400 4 5.625 145.48438 145 2407.962 -0.332
4800 2 11.25 145.48438 145 4815.925 -0.332
9600 1 22.5 145.48438 145 9631.849 -0.332
19200 1 22.5 72.242188 72 19263.7 -0.332
38400 1 22.5 35.621094 36 38006.76 1.024
57600 1 22.5 23.414063 23 58593.75 -1.725
76800 1 22.5 17.310547 17 78125 -1.725
115200 1 22.5 11.207031 11 117187.5 -1.725
Table 17.3 UART baud-rate settings with UART_CLK (BµILD_CLK) frequency = 22.5MHz
Baud Rate
Required
Division
Select
Value
Reference
Clock (MHz)
Baud Rate
Ratio
Prog.
BRR
Value
Programmed
Baud Rate
Baud Rate
Error (%)
1200 8 2.96875 153.6224 154 1197.077 0.244
2400 4 5.9375 153.6224 154 2394.153 0.244
4800 2 11.875 153.6224 154 4788.306 0.244
9600 1 23.75 153.6224 154 9576.613 0.244
19200 1 23.75 76.311198 76 19277.6 -0.404
38400 1 23.75 37.655599 38 38060.9 0.883
57600 1 23.75 24.770399 25 57091.35 0.883
76800 1 23.75 18.327799 18 78125 -1.725
115200 1 23.75 11.8852 12 114182.7 0.883
Table 17.4 UART baud-rate settings with UART_CLK (BµILD_CLK) frequency = 23.75MHz