STMicroelectronics STM32F407 User Manual

Universal synchronous asynchronous receiver transmitter (USART) RM0090
978/1731 DocID018909 Rev 11
8. 896 KBps 909.091 KBps 2.0625 1.46% 895.522 KBps 4.1875 0.05%
9. 921.6 KBps 909.091 KBps 2.0625 1.36% 923.077 KBps 4.0625 0.16%
10. 1.792 MBps 1.1764 MBps 1.0625 1.52% 1.8182 MBps 2.0625 1.36%
11.
1.8432
MBps
1.8750 MBps 1.0000 1.73% 1.8182 MBps 2.0625 1.52%
12. 3.584 MBps NA NA NA 3.2594 MBps 1.0625 1.52%
13.
3.6864
MBps
NA NA NA 3.7500 MBps 1.0000 1.73%
14. 7.168 MBps NA NA NA NA NA NA
15.
7.3728
MBps
NA NA NA NA NA NA
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 139. Error calculation for programmed baud rates at f
PCLK
= 30 MHz or f
PCLK
= 60 MHz,
oversampling by 16
(1)(2)
(continued)
Oversampling by 16 (OVER8=0)
Baud rate f
PCLK
= 30 MHz f
PCLK
= 60 MHz
S.No Desired Actual
Value
programme
d in the
baud rate
register
% Error =
(Calculated -
Desired)B.Rate
/Desired B.Rate
Actual
Value
programmed
in the baud
rate register
%
Error
Table 140. Error calculation for programmed baud rates at f
PCLK
= 30 MHz or f
PCLK
= 60 MHz,
oversampling by 8
(1) (2)
Oversampling by 8 (OVER8=1)
Baud rate f
PCLK
= 30 MHz f
PCLK
=60 MHz
S.No Desired Actual
Value
programme
d in the
baud rate
register
% Error =
(Calculated -
Desired)B.Rate
/Desired B.Rate
Actual
Value
programmed
in the baud
rate register
%
Error
1. 2.4 KBps 2.400 KBps 1562.5000 0.00% 2.400 KBps 3125.0000 0.00%
2. 9.6 KBps 9.600 KBps 390.6250 0.00% 9.600 KBps 781.2500 0.00%
3. 19.2 KBps 19.194 KBps 195.3750 0.03% 19.200 KBps 390.6250 0.00%
4. 57.6 KBps 57.582 KBps 65.1250 0.16% 57.582 KBps 130.2500 0.03%
5. 115.2 KBps 115.385 KBps 32.5000 0.16% 115.163 KBps 65.1250 0.03%
6. 230.4 KBps 230.769 KBps 16.2500 0.16% 230.769 KBps 32.5000 0.16%
7. 460.8 KBps 461.538 KBps 8.1250 0.16% 461.538 KBps 16.2500 0.16%
8. 896 KBps 909.091 KBps 4.1250 1.46% 895.522 KBps 8.3750 0.05%

STMicroelectronics STM32F407 Specifications

General

Brand	STMicroelectronics
Model	STM32F407
Category	Controller
Language	English