Clock source for USART3/4 IN STM32G070

[Mmei]

STM32G070. It is said there are 4 USARTS in the datasheet. For USART3/4, there is no place talking about the clock source for them. Would you please tell us what's the clock source for the USART3/4?

[waclawek.jan · Accepted solution]

From RM0444, USART block diagram subchapter:

When the dual clock domain feature is disabled, the usart_ker_ck clock is the same as the usart_pclk clock.

(and from the table in USART implementation subchapter, USART3/4 don't have the dual clock domain feature).

In other words, USART3/4 are clocked from the respective APB clock.

JW

[Muhammad Moiz khan]

USART3 and USART4 both are clocked from APB clock, You can set the 18th and 19bit bit in the (RCC_APBENR) register to enable the clock for USART3 and USART4.

Hope that help you!

Best of luck!

Muhammad Moiz khan