2022-09-18 02:23 PM
Thank you in advance.
2022-09-19 05:31 AM
HI @Gencay,
I think your mixed-up external clocks (i.e. pins) and internal clock (aka bus clocks and kernel clocks).
In Datasheet, you mostly see external clock on pins (unless otherwise indicated).
Internal clock limits are mostly visible in RCC section inside Reference Manual (look for "Peripheral clock distribution overview" table).
1) max I2C clock on the pin is as per standard 1MHz (FastMode+). Internal clock for I2C is either 104.5MHz or 133MHz depending on I2C instance.
2) LTDC has lower IO strength when used at 1.8V, this will limit the frequency and so the pixel/s capabilities which constrains the frame rate and the display resolution.
See also ES0438 as there is also some potential LTDC clock limitations depending on HSE clocking type and load on LTDC pins.
3) it is usual to have overlapping ranges within electrical characteristics. You should use the most favorable line including your VDD operating point.
4) I guess you mixed up :
Regards.
In order to give better visibility on the answered topics, please click on 'Select as Best' on the reply which solved your issue or answered your question. See also 'Best Answers'