STM32U5 documentation error in HSI -> TIM5 interconnect section

[Terry Greeniaus]

In section 16.3.7 of STM32U5 RM0456 Rev 2, the following text appears in the bullet that notes MSIK, HSI and LSI are linked to TIM2/TIM3/TIM4/TIM5:

"External clock mode1: Table 446: Interconnect to the tim_ti1 input multiplexer for TIM5, tim_ti1_in1 (LSI) and tim_ti1_in2(HSI)"

However, in section 47.4.2 Table 446 (TIM2/3/4/5 "Interconnect to the tim_ti1 input multiplexer") tim_ti1_in2 connects LSE rather than HSI to TIM5.

On previous MCUs such as the STM32G4, the LSE is connected to TIM5 on tim_ti1_in2 and when measuring on a Nucleo-U575ZI-Q board it also appears to be counting LSE ticks rather than HSI ticks. This leads me to believe that Table 446 is correct and section 16.3.7 is incorrect.

[Imen.D · Accepted solution]

Hello @Terry Greeniaus​ ,

Thank you for having reported the point.

I confirm the mistake.

An internal ticket (number 122889) is submitted in order to correct this error in next RM release.

(PS: ticket number 122889, this is an internal tracking number and is not accessible or usable by customers).

Imen