Калькулятор скорости UART для AVR

Опубликовано пн, 06/04/2018 - 22:00 пользователем trol

Калькулятор скорости UART для AVR-микроконтроллеров. По умолчанию отображаются таблицы для основных популярных частот процессора и скоростей обмена. При желании эти параметры можно изменить.

Значения в таблицах подсвечены разными цветами в зависимости от отклонения реальной частоты передачи от желаемой: менее 0.1%, менее 0.5%, менее 1%, менее 2%, менее 3%, более 3%.

f_CPU = 1 MHz
Bit Rate	U2Xn = 0				U2Xn = 1
Bit Rate	UBRR (dec)	UBRR (hex)	Actual Bit Rate	Error	UBRR (dec)	UBRR (hex)	Actual Bit Rate	Error
300	207	0x00CF	300.48	0.2%	416	0x01A0	299.76	-0.1%
600	103	0x0067	600.96	0.2%	207	0x00CF	600.96	0.2%
900	68	0x0044	905.8	0.6%	138	0x008A	899.28	-0.1%
1200	51	0x0033	1201.92	0.2%	103	0x0067	1201.92	0.2%
1800	34	0x0022	1785.71	-0.8%	68	0x0044	1811.59	0.6%
2400	25	0x0019	2403.85	0.2%	51	0x0033	2403.85	0.2%
3600	16	0x0010	3676.47	2.1%	34	0x0022	3571.43	-0.8%
4800	12	0x000C	4807.69	0.2%	25	0x0019	4807.69	0.2%
9600	6	0x0006	8928.57	-7%	12	0x000C	9615.38	0.2%
14.4 K	3	0x0003	15.625 K	8.5%	8	0x0008	13.889 K	-3.5%
19.2 K	2	0x0002	20.833 K	8.5%	6	0x0006	17.857 K	-7%
28.8 K	1	0x0001	31.25 K	8.5%	3	0x0003	31.25 K	8.5%
33.6 K	1	0x0001	31.25 K	-7%	3	0x0003	31.25 K	-7%
38.4 K	1	0x0001	31.25 K	-18.6%	2	0x0002	41.667 K	8.5%
56 K	0	0x0000	62.5 K	11.6%	1	0x0001	62.5 K	11.6%
57.6 K	0	0x0000	62.5 K	8.5%	1	0x0001	62.5 K	8.5%
76.8 K	0	0x0000	62.5 K	-18.6%	1	0x0001	62.5 K	-18.6%
115.2 K	0	0x0000	62.5 K	-45.7%	0	0x0000	125 K	8.5%
128 K	0	0x0000	62.5 K	-51.2%	0	0x0000	125 K	-2.3%
153.6 K	0	0x0000	62.5 K	-59.3%	0	0x0000	125 K	-18.6%
230.4 K	0	0x0000	62.5 K	-72.9%	0	0x0000	125 K	-45.7%

f_CPU = 1.8432 MHz
Bit Rate	U2Xn = 0				U2Xn = 1
Bit Rate	UBRR (dec)	UBRR (hex)	Actual Bit Rate	Error	UBRR (dec)	UBRR (hex)	Actual Bit Rate	Error
300	383	0x017F	300	0%	767	0x02FF	300	0%
600	191	0x00BF	600	0%	383	0x017F	600	0%
900	127	0x007F	900	0%	255	0x00FF	900	0%
1200	95	0x005F	1200	0%	191	0x00BF	1200	0%
1800	63	0x003F	1800	0%	127	0x007F	1800	0%
2400	47	0x002F	2400	0%	95	0x005F	2400	0%
3600	31	0x001F	3600	0%	63	0x003F	3600	0%
4800	23	0x0017	4800	0%	47	0x002F	4800	0%
9600	11	0x000B	9600	0%	23	0x0017	9600	0%
14.4 K	7	0x0007	14.4 K	0%	15	0x000F	14.4 K	0%
19.2 K	5	0x0005	19.2 K	0%	11	0x000B	19.2 K	0%
28.8 K	3	0x0003	28.8 K	0%	7	0x0007	28.8 K	0%
33.6 K	2	0x0002	38.4 K	14.3%	6	0x0006	32.914 K	-2%
38.4 K	2	0x0002	38.4 K	0%	5	0x0005	38.4 K	0%
56 K	1	0x0001	57.6 K	2.9%	3	0x0003	57.6 K	2.9%
57.6 K	1	0x0001	57.6 K	0%	3	0x0003	57.6 K	0%
76.8 K	1	0x0001	57.6 K	-25%	2	0x0002	76.8 K	0%
115.2 K	0	0x0000	115.2 K	0%	1	0x0001	115.2 K	0%
128 K	0	0x0000	115.2 K	-10%	1	0x0001	115.2 K	-10%
153.6 K	0	0x0000	115.2 K	-25%	1	0x0001	115.2 K	-25%
230.4 K	0	0x0000	115.2 K	-50%	0	0x0000	230.4 K	0%

f_CPU = 2 MHz
Bit Rate	U2Xn = 0				U2Xn = 1
Bit Rate	UBRR (dec)	UBRR (hex)	Actual Bit Rate	Error	UBRR (dec)	UBRR (hex)	Actual Bit Rate	Error
300	416	0x01A0	299.76	-0.1%	832	0x0340	300.12	0%
600	207	0x00CF	600.96	0.2%	416	0x01A0	599.52	-0.1%
900	138	0x008A	899.28	-0.1%	277	0x0115	899.28	-0.1%
1200	103	0x0067	1201.92	0.2%	207	0x00CF	1201.92	0.2%
1800	68	0x0044	1811.59	0.6%	138	0x008A	1798.56	-0.1%
2400	51	0x0033	2403.85	0.2%	103	0x0067	2403.85	0.2%
3600	34	0x0022	3571.43	-0.8%	68	0x0044	3623.19	0.6%
4800	25	0x0019	4807.69	0.2%	51	0x0033	4807.69	0.2%
9600	12	0x000C	9615.38	0.2%	25	0x0019	9615.38	0.2%
14.4 K	8	0x0008	13.889 K	-3.5%	16	0x0010	14.706 K	2.1%
19.2 K	6	0x0006	17.857 K	-7%	12	0x000C	19.231 K	0.2%
28.8 K	3	0x0003	31.25 K	8.5%	8	0x0008	27.778 K	-3.5%
33.6 K	3	0x0003	31.25 K	-7%	6	0x0006	35.714 K	6.3%
38.4 K	2	0x0002	41.667 K	8.5%	6	0x0006	35.714 K	-7%
56 K	1	0x0001	62.5 K	11.6%	3	0x0003	62.5 K	11.6%
57.6 K	1	0x0001	62.5 K	8.5%	3	0x0003	62.5 K	8.5%
76.8 K	1	0x0001	62.5 K	-18.6%	2	0x0002	83.333 K	8.5%
115.2 K	0	0x0000	125 K	8.5%	1	0x0001	125 K	8.5%
128 K	0	0x0000	125 K	-2.3%	1	0x0001	125 K	-2.3%
153.6 K	0	0x0000	125 K	-18.6%	1	0x0001	125 K	-18.6%
230.4 K	0	0x0000	125 K	-45.7%	0	0x0000	250 K	8.5%

f_CPU = 3.6864 MHz
Bit Rate	U2Xn = 0				U2Xn = 1
Bit Rate	UBRR (dec)	UBRR (hex)	Actual Bit Rate	Error	UBRR (dec)	UBRR (hex)	Actual Bit Rate	Error
300	767	0x02FF	300	0%	1535	0x05FF	300	0%
600	383	0x017F	600	0%	767	0x02FF	600	0%
900	255	0x00FF	900	0%	511	0x01FF	900	0%
1200	191	0x00BF	1200	0%	383	0x017F	1200	0%
1800	127	0x007F	1800	0%	255	0x00FF	1800	0%
2400	95	0x005F	2400	0%	191	0x00BF	2400	0%
3600	63	0x003F	3600	0%	127	0x007F	3600	0%
4800	47	0x002F	4800	0%	95	0x005F	4800	0%
9600	23	0x0017	9600	0%	47	0x002F	9600	0%
14.4 K	15	0x000F	14.4 K	0%	31	0x001F	14.4 K	0%
19.2 K	11	0x000B	19.2 K	0%	23	0x0017	19.2 K	0%
28.8 K	7	0x0007	28.8 K	0%	15	0x000F	28.8 K	0%
33.6 K	6	0x0006	32.914 K	-2%	13	0x000D	32.914 K	-2%
38.4 K	5	0x0005	38.4 K	0%	11	0x000B	38.4 K	0%
56 K	3	0x0003	57.6 K	2.9%	7	0x0007	57.6 K	2.9%
57.6 K	3	0x0003	57.6 K	0%	7	0x0007	57.6 K	0%
76.8 K	2	0x0002	76.8 K	0%	5	0x0005	76.8 K	0%
115.2 K	1	0x0001	115.2 K	0%	3	0x0003	115.2 K	0%
128 K	1	0x0001	115.2 K	-10%	3	0x0003	115.2 K	-10%
153.6 K	1	0x0001	115.2 K	-25%	2	0x0002	153.6 K	0%
230.4 K	0	0x0000	230.4 K	0%	1	0x0001	230.4 K	0%

f_CPU = 4 MHz
Bit Rate	U2Xn = 0				U2Xn = 1
Bit Rate	UBRR (dec)	UBRR (hex)	Actual Bit Rate	Error	UBRR (dec)	UBRR (hex)	Actual Bit Rate	Error
300	832	0x0340	300.12	0%	1666	0x0682	299.94	0%
600	416	0x01A0	599.52	-0.1%	832	0x0340	600.24	0%
900	277	0x0115	899.28	-0.1%	555	0x022B	899.28	-0.1%
1200	207	0x00CF	1201.92	0.2%	416	0x01A0	1199.04	-0.1%
1800	138	0x008A	1798.56	-0.1%	277	0x0115	1798.56	-0.1%
2400	103	0x0067	2403.85	0.2%	207	0x00CF	2403.85	0.2%
3600	68	0x0044	3623.19	0.6%	138	0x008A	3597.12	-0.1%
4800	51	0x0033	4807.69	0.2%	103	0x0067	4807.69	0.2%
9600	25	0x0019	9615.38	0.2%	51	0x0033	9615.38	0.2%
14.4 K	16	0x0010	14.706 K	2.1%	34	0x0022	14.286 K	-0.8%
19.2 K	12	0x000C	19.231 K	0.2%	25	0x0019	19.231 K	0.2%
28.8 K	8	0x0008	27.778 K	-3.5%	16	0x0010	29.412 K	2.1%
33.6 K	6	0x0006	35.714 K	6.3%	14	0x000E	33.333 K	-0.8%
38.4 K	6	0x0006	35.714 K	-7%	12	0x000C	38.462 K	0.2%
56 K	3	0x0003	62.5 K	11.6%	8	0x0008	55.556 K	-0.8%
57.6 K	3	0x0003	62.5 K	8.5%	8	0x0008	55.556 K	-3.5%
76.8 K	2	0x0002	83.333 K	8.5%	6	0x0006	71.429 K	-7%
115.2 K	1	0x0001	125 K	8.5%	3	0x0003	125 K	8.5%
128 K	1	0x0001	125 K	-2.3%	3	0x0003	125 K	-2.3%
153.6 K	1	0x0001	125 K	-18.6%	2	0x0002	166.667 K	8.5%
230.4 K	0	0x0000	250 K	8.5%	1	0x0001	250 K	8.5%

f_CPU = 7.3728 MHz
Bit Rate	U2Xn = 0				U2Xn = 1
Bit Rate	UBRR (dec)	UBRR (hex)	Actual Bit Rate	Error	UBRR (dec)	UBRR (hex)	Actual Bit Rate	Error
300	1535	0x05FF	300	0%	3071	0x0BFF	300	0%
600	767	0x02FF	600	0%	1535	0x05FF	600	0%
900	511	0x01FF	900	0%	1023	0x03FF	900	0%
1200	383	0x017F	1200	0%	767	0x02FF	1200	0%
1800	255	0x00FF	1800	0%	511	0x01FF	1800	0%
2400	191	0x00BF	2400	0%	383	0x017F	2400	0%
3600	127	0x007F	3600	0%	255	0x00FF	3600	0%
4800	95	0x005F	4800	0%	191	0x00BF	4800	0%
9600	47	0x002F	9600	0%	95	0x005F	9600	0%
14.4 K	31	0x001F	14.4 K	0%	63	0x003F	14.4 K	0%
19.2 K	23	0x0017	19.2 K	0%	47	0x002F	19.2 K	0%
28.8 K	15	0x000F	28.8 K	0%	31	0x001F	28.8 K	0%
33.6 K	13	0x000D	32.914 K	-2%	26	0x001A	34.133 K	1.6%
38.4 K	11	0x000B	38.4 K	0%	23	0x0017	38.4 K	0%
56 K	7	0x0007	57.6 K	2.9%	15	0x000F	57.6 K	2.9%
57.6 K	7	0x0007	57.6 K	0%	15	0x000F	57.6 K	0%
76.8 K	5	0x0005	76.8 K	0%	11	0x000B	76.8 K	0%
115.2 K	3	0x0003	115.2 K	0%	7	0x0007	115.2 K	0%
128 K	3	0x0003	115.2 K	-10%	6	0x0006	131.657 K	2.9%
153.6 K	2	0x0002	153.6 K	0%	5	0x0005	153.6 K	0%
230.4 K	1	0x0001	230.4 K	0%	3	0x0003	230.4 K	0%

f_CPU = 8 MHz
Bit Rate	U2Xn = 0				U2Xn = 1
Bit Rate	UBRR (dec)	UBRR (hex)	Actual Bit Rate	Error	UBRR (dec)	UBRR (hex)	Actual Bit Rate	Error
300	1666	0x0682	299.94	0%	3332	0x0D04	300.03	0%
600	832	0x0340	600.24	0%	1666	0x0682	599.88	0%
900	555	0x022B	899.28	-0.1%	1110	0x0456	900.09	0%
1200	416	0x01A0	1199.04	-0.1%	832	0x0340	1200.48	0%
1800	277	0x0115	1798.56	-0.1%	555	0x022B	1798.56	-0.1%
2400	207	0x00CF	2403.85	0.2%	416	0x01A0	2398.08	-0.1%
3600	138	0x008A	3597.12	-0.1%	277	0x0115	3597.12	-0.1%
4800	103	0x0067	4807.69	0.2%	207	0x00CF	4807.69	0.2%
9600	51	0x0033	9615.38	0.2%	103	0x0067	9615.38	0.2%
14.4 K	34	0x0022	14.286 K	-0.8%	68	0x0044	14.493 K	0.6%
19.2 K	25	0x0019	19.231 K	0.2%	51	0x0033	19.231 K	0.2%
28.8 K	16	0x0010	29.412 K	2.1%	34	0x0022	28.571 K	-0.8%
33.6 K	14	0x000E	33.333 K	-0.8%	29	0x001D	33.333 K	-0.8%
38.4 K	12	0x000C	38.462 K	0.2%	25	0x0019	38.462 K	0.2%
56 K	8	0x0008	55.556 K	-0.8%	17	0x0011	55.556 K	-0.8%
57.6 K	8	0x0008	55.556 K	-3.5%	16	0x0010	58.824 K	2.1%
76.8 K	6	0x0006	71.429 K	-7%	12	0x000C	76.923 K	0.2%
115.2 K	3	0x0003	125 K	8.5%	8	0x0008	111.111 K	-3.5%
128 K	3	0x0003	125 K	-2.3%	7	0x0007	125 K	-2.3%
153.6 K	2	0x0002	166.667 K	8.5%	6	0x0006	142.857 K	-7%
230.4 K	1	0x0001	250 K	8.5%	3	0x0003	250 K	8.5%

f_CPU = 10 MHz
Bit Rate	U2Xn = 0				U2Xn = 1
Bit Rate	UBRR (dec)	UBRR (hex)	Actual Bit Rate	Error	UBRR (dec)	UBRR (hex)	Actual Bit Rate	Error
300	2082	0x0822	300.05	0%	4166	0x1046	299.98	0%
600	1041	0x0411	599.81	0%	2082	0x0822	600.1	0%
900	693	0x02B5	900.58	0.1%	1388	0x056C	899.93	0%
1200	520	0x0208	1199.62	0%	1041	0x0411	1199.62	0%
1800	346	0x015A	1801.15	0.1%	693	0x02B5	1801.15	0.1%
2400	259	0x0103	2403.85	0.2%	520	0x0208	2399.23	0%
3600	173	0x00AD	3591.95	-0.2%	346	0x015A	3602.31	0.1%
4800	129	0x0081	4807.69	0.2%	259	0x0103	4807.69	0.2%
9600	64	0x0040	9615.38	0.2%	129	0x0081	9615.38	0.2%
14.4 K	42	0x002A	14.535 K	0.9%	86	0x0056	14.368 K	-0.2%
19.2 K	32	0x0020	18.939 K	-1.4%	64	0x0040	19.231 K	0.2%
28.8 K	21	0x0015	28.409 K	-1.4%	42	0x002A	29.07 K	0.9%
33.6 K	18	0x0012	32.895 K	-2.1%	36	0x0024	33.784 K	0.5%
38.4 K	15	0x000F	39.063 K	1.7%	32	0x0020	37.879 K	-1.4%
56 K	10	0x000A	56.818 K	1.5%	21	0x0015	56.818 K	1.5%
57.6 K	10	0x000A	56.818 K	-1.4%	21	0x0015	56.818 K	-1.4%
76.8 K	7	0x0007	78.125 K	1.7%	15	0x000F	78.125 K	1.7%
115.2 K	4	0x0004	125 K	8.5%	10	0x000A	113.636 K	-1.4%
128 K	4	0x0004	125 K	-2.3%	9	0x0009	125 K	-2.3%
153.6 K	3	0x0003	156.25 K	1.7%	7	0x0007	156.25 K	1.7%
230.4 K	2	0x0002	208.333 K	-9.6%	4	0x0004	250 K	8.5%

f_CPU = 11.0592 MHz
Bit Rate	U2Xn = 0				U2Xn = 1
Bit Rate	UBRR (dec)	UBRR (hex)	Actual Bit Rate	Error	UBRR (dec)	UBRR (hex)	Actual Bit Rate	Error
300	2303	0x08FF	300	0%	4607	0x11FF	300	0%
600	1151	0x047F	600	0%	2303	0x08FF	600	0%
900	767	0x02FF	900	0%	1535	0x05FF	900	0%
1200	575	0x023F	1200	0%	1151	0x047F	1200	0%
1800	383	0x017F	1800	0%	767	0x02FF	1800	0%
2400	287	0x011F	2400	0%	575	0x023F	2400	0%
3600	191	0x00BF	3600	0%	383	0x017F	3600	0%
4800	143	0x008F	4800	0%	287	0x011F	4800	0%
9600	71	0x0047	9600	0%	143	0x008F	9600	0%
14.4 K	47	0x002F	14.4 K	0%	95	0x005F	14.4 K	0%
19.2 K	35	0x0023	19.2 K	0%	71	0x0047	19.2 K	0%
28.8 K	23	0x0017	28.8 K	0%	47	0x002F	28.8 K	0%
33.6 K	20	0x0014	32.914 K	-2%	40	0x0028	33.717 K	0.3%
38.4 K	17	0x0011	38.4 K	0%	35	0x0023	38.4 K	0%
56 K	11	0x000B	57.6 K	2.9%	24	0x0018	55.296 K	-1.3%
57.6 K	11	0x000B	57.6 K	0%	23	0x0017	57.6 K	0%
76.8 K	8	0x0008	76.8 K	0%	17	0x0011	76.8 K	0%
115.2 K	5	0x0005	115.2 K	0%	11	0x000B	115.2 K	0%
128 K	4	0x0004	138.24 K	8%	10	0x000A	125.673 K	-1.8%
153.6 K	4	0x0004	138.24 K	-10%	8	0x0008	153.6 K	0%
230.4 K	2	0x0002	230.4 K	0%	5	0x0005	230.4 K	0%

f_CPU = 14.7456 MHz
Bit Rate	U2Xn = 0				U2Xn = 1
Bit Rate	UBRR (dec)	UBRR (hex)	Actual Bit Rate	Error	UBRR (dec)	UBRR (hex)	Actual Bit Rate	Error
300	3071	0x0BFF	300	0%	6143	0x17FF	300	0%
600	1535	0x05FF	600	0%	3071	0x0BFF	600	0%
900	1023	0x03FF	900	0%	2047	0x07FF	900	0%
1200	767	0x02FF	1200	0%	1535	0x05FF	1200	0%
1800	511	0x01FF	1800	0%	1023	0x03FF	1800	0%
2400	383	0x017F	2400	0%	767	0x02FF	2400	0%
3600	255	0x00FF	3600	0%	511	0x01FF	3600	0%
4800	191	0x00BF	4800	0%	383	0x017F	4800	0%
9600	95	0x005F	9600	0%	191	0x00BF	9600	0%
14.4 K	63	0x003F	14.4 K	0%	127	0x007F	14.4 K	0%
19.2 K	47	0x002F	19.2 K	0%	95	0x005F	19.2 K	0%
28.8 K	31	0x001F	28.8 K	0%	63	0x003F	28.8 K	0%
33.6 K	26	0x001A	34.133 K	1.6%	54	0x0036	33.513 K	-0.3%
38.4 K	23	0x0017	38.4 K	0%	47	0x002F	38.4 K	0%
56 K	15	0x000F	57.6 K	2.9%	32	0x0020	55.855 K	-0.3%
57.6 K	15	0x000F	57.6 K	0%	31	0x001F	57.6 K	0%
76.8 K	11	0x000B	76.8 K	0%	23	0x0017	76.8 K	0%
115.2 K	7	0x0007	115.2 K	0%	15	0x000F	115.2 K	0%
128 K	6	0x0006	131.657 K	2.9%	13	0x000D	131.657 K	2.9%
153.6 K	5	0x0005	153.6 K	0%	11	0x000B	153.6 K	0%
230.4 K	3	0x0003	230.4 K	0%	7	0x0007	230.4 K	0%

f_CPU = 16 MHz
Bit Rate	U2Xn = 0				U2Xn = 1
Bit Rate	UBRR (dec)	UBRR (hex)	Actual Bit Rate	Error	UBRR (dec)	UBRR (hex)	Actual Bit Rate	Error
300	3332	0x0D04	300.03	0%	6666	0x1A0A	299.99	0%
600	1666	0x0682	599.88	0%	3332	0x0D04	600.06	0%
900	1110	0x0456	900.09	0%	2221	0x08AD	900.09	0%
1200	832	0x0340	1200.48	0%	1666	0x0682	1199.76	0%
1800	555	0x022B	1798.56	-0.1%	1110	0x0456	1800.18	0%
2400	416	0x01A0	2398.08	-0.1%	832	0x0340	2400.96	0%
3600	277	0x0115	3597.12	-0.1%	555	0x022B	3597.12	-0.1%
4800	207	0x00CF	4807.69	0.2%	416	0x01A0	4796.16	-0.1%
9600	103	0x0067	9615.38	0.2%	207	0x00CF	9615.38	0.2%
14.4 K	68	0x0044	14.493 K	0.6%	138	0x008A	14.388 K	-0.1%
19.2 K	51	0x0033	19.231 K	0.2%	103	0x0067	19.231 K	0.2%
28.8 K	34	0x0022	28.571 K	-0.8%	68	0x0044	28.986 K	0.6%
33.6 K	29	0x001D	33.333 K	-0.8%	59	0x003B	33.333 K	-0.8%
38.4 K	25	0x0019	38.462 K	0.2%	51	0x0033	38.462 K	0.2%
56 K	17	0x0011	55.556 K	-0.8%	35	0x0023	55.556 K	-0.8%
57.6 K	16	0x0010	58.824 K	2.1%	34	0x0022	57.143 K	-0.8%
76.8 K	12	0x000C	76.923 K	0.2%	25	0x0019	76.923 K	0.2%
115.2 K	8	0x0008	111.111 K	-3.5%	16	0x0010	117.647 K	2.1%
128 K	7	0x0007	125 K	-2.3%	15	0x000F	125 K	-2.3%
153.6 K	6	0x0006	142.857 K	-7%	12	0x000C	153.846 K	0.2%
230.4 K	3	0x0003	250 K	8.5%	8	0x0008	222.222 K	-3.5%

f_CPU = 18.432 MHz
Bit Rate	U2Xn = 0				U2Xn = 1
Bit Rate	UBRR (dec)	UBRR (hex)	Actual Bit Rate	Error	UBRR (dec)	UBRR (hex)	Actual Bit Rate	Error
300	3839	0x0EFF	300	0%	7679	0x1DFF	300	0%
600	1919	0x077F	600	0%	3839	0x0EFF	600	0%
900	1279	0x04FF	900	0%	2559	0x09FF	900	0%
1200	959	0x03BF	1200	0%	1919	0x077F	1200	0%
1800	639	0x027F	1800	0%	1279	0x04FF	1800	0%
2400	479	0x01DF	2400	0%	959	0x03BF	2400	0%
3600	319	0x013F	3600	0%	639	0x027F	3600	0%
4800	239	0x00EF	4800	0%	479	0x01DF	4800	0%
9600	119	0x0077	9600	0%	239	0x00EF	9600	0%
14.4 K	79	0x004F	14.4 K	0%	159	0x009F	14.4 K	0%
19.2 K	59	0x003B	19.2 K	0%	119	0x0077	19.2 K	0%
28.8 K	39	0x0027	28.8 K	0%	79	0x004F	28.8 K	0%
33.6 K	33	0x0021	33.882 K	0.8%	68	0x0044	33.391 K	-0.6%
38.4 K	29	0x001D	38.4 K	0%	59	0x003B	38.4 K	0%
56 K	20	0x0014	54.857 K	-2%	40	0x0028	56.195 K	0.3%
57.6 K	19	0x0013	57.6 K	0%	39	0x0027	57.6 K	0%
76.8 K	14	0x000E	76.8 K	0%	29	0x001D	76.8 K	0%
115.2 K	9	0x0009	115.2 K	0%	19	0x0013	115.2 K	0%
128 K	8	0x0008	128 K	0%	17	0x0011	128 K	0%
153.6 K	7	0x0007	144 K	-6.3%	14	0x000E	153.6 K	0%
230.4 K	4	0x0004	230.4 K	0%	9	0x0009	230.4 K	0%

f_CPU = 20 MHz
Bit Rate	U2Xn = 0				U2Xn = 1
Bit Rate	UBRR (dec)	UBRR (hex)	Actual Bit Rate	Error	UBRR (dec)	UBRR (hex)	Actual Bit Rate	Error
300	4166	0x1046	299.98	0%	8332	0x208C	300.01	0%
600	2082	0x0822	600.1	0%	4166	0x1046	599.95	0%
900	1388	0x056C	899.93	0%	2777	0x0AD9	899.93	0%
1200	1041	0x0411	1199.62	0%	2082	0x0822	1200.19	0%
1800	693	0x02B5	1801.15	0.1%	1388	0x056C	1799.86	0%
2400	520	0x0208	2399.23	0%	1041	0x0411	2399.23	0%
3600	346	0x015A	3602.31	0.1%	693	0x02B5	3602.31	0.1%
4800	259	0x0103	4807.69	0.2%	520	0x0208	4798.46	0%
9600	129	0x0081	9615.38	0.2%	259	0x0103	9615.38	0.2%
14.4 K	86	0x0056	14.368 K	-0.2%	173	0x00AD	14.368 K	-0.2%
19.2 K	64	0x0040	19.231 K	0.2%	129	0x0081	19.231 K	0.2%
28.8 K	42	0x002A	29.07 K	0.9%	86	0x0056	28.736 K	-0.2%
33.6 K	36	0x0024	33.784 K	0.5%	73	0x0049	33.784 K	0.5%
38.4 K	32	0x0020	37.879 K	-1.4%	64	0x0040	38.462 K	0.2%
56 K	21	0x0015	56.818 K	1.5%	44	0x002C	55.556 K	-0.8%
57.6 K	21	0x0015	56.818 K	-1.4%	42	0x002A	58.14 K	0.9%
76.8 K	15	0x000F	78.125 K	1.7%	32	0x0020	75.758 K	-1.4%
115.2 K	10	0x000A	113.636 K	-1.4%	21	0x0015	113.636 K	-1.4%
128 K	9	0x0009	125 K	-2.3%	19	0x0013	125 K	-2.3%
153.6 K	7	0x0007	156.25 K	1.7%	15	0x000F	156.25 K	1.7%
230.4 K	4	0x0004	250 K	8.5%	10	0x000A	227.273 K	-1.4%

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