ST STM32F405 User Manual

Universal synchronous asynchronous receiver transmitter (USART) RM0090
986/1749 RM0090 Rev 18
11. 1.8432 MBps 1.8750 MBps 2.0000 1.73% 1.8182 MBps 4.1250 1.36%
12. 3.584 MBps 3.7500 MBps 1.0000 4.63% 3.5294 MBps 2.1250 1.52%
13. 3.6864 MBps 3.7500 MBps 1.0000 1.73% 3.7500 MBps 2.0000 1.73%
14. 7.168 MBps NA NA NA 7.5000 MBps 1.0000 4.63%
15. 7.3728 MBps NA NA NA 7.5000 MBps 1.0000 1.73%
1. The lower the CPU clock the lower the accuracy for a particular baud rate. The upper limit of the achievable baud rate can
be fixed with these data.
2. Only USART1 and USART6 are clocked with PCLK2. Other USARTs are clocked with PCLK1. Refer to the device
datasheets for the maximum values for PCLK1 and PCLK2.
Table 141. Error calculation for programmed baud rates at f
PCLK
= 30 MHz or f
PCLK
= 60 MHz,
oversampling by 8
(1) (2)
(continued)
Oversampling by 8 (OVER8=1)
Baud rate f
PCLK
= 30 MHz f
PCLK
=60 MHz
S.No Desired Actual
Value
programmed
in the baud
rate register
% Error =
(Calculated -
Desired)B.Rate
/Desired B.Rate
Actual
Value
programmed
in the baud
rate register
%
Error
Table 142. Error calculation for programmed baud rates at f
PCLK
= 42 MHz or f
PCLK
= 84 Hz,
oversampling by 16
(1)(2)
Oversampling by 16 (OVER8=0)
Baud rate f
PCLK
= 42 MHz f
PCLK
= 84 MHz
S.No Desired Actual
Value
programmed
in the baud
rate register
% Error =
(Calculated -
Desired)B.Rate
/Desired B.Rate
Actual
Value
programmed
in the baud
rate register
%
Error
1. 1.2 KBps 1.2 KBps 2187.5 0 1.2 KBps NA 0
2. 2.4 KBps 2.4 KBps 1093.75 0 2.4 KBps 2187.5 0
3. 9.6 KBps 9.6 KBps 273.4375 0 9.6 KBps 546.875 0
4. 19.2 KBps 19.195 KBps 136.75 0.02 19.2 KBps 273.4375 0
5. 38.4 KBps 38.391 KBps 68.375 0.02 38.391 KBps 136.75 0.02
6. 57.6 KBps 57.613 KBps 45.5625 0.02 57.613 KBps 91.125 0.02
7. 115.2 KBps 115.068 KBps 22.8125 0.11 115.226 KBps 45.5625 0.02
8. 230.4 KBps 230.769 KBps 11.375 0.16 230.137 KBps 22.8125 0.11
9. 460.8 KBps 461.538 KBps 5.6875 0.16 461.538 KBps 11.375 0.16
10. 921.6 KBps 913.043 KBps 2.875 0.93 923.076 KBps 5.6875 0.93
11. 1.792 MBps 1.826 MBps 1.4375 1.9 1.787 MBps 2.9375 0.27
12. 1.8432 MBps 1.826 MBps 1.4375 0.93 1.826 MBps 2.875 0.93
13. 3.584 MBps N.A N.A N.A 3.652 MBps 1.4375 1.9
14. 3.6864 MBps N.A N.A N.A 3.652 MBps 1.4375 0.93

ST STM32F405 Specifications

General

Brand	ST
Model	STM32F405
Category	Computer Hardware
Language	English