Dear community,
we want to enable the DFSDM1 module in SPI mode for the STM32H743ZI with the latest STM32CubeMX, Version 5.1.0 and the STM32Cube MCU Package for STM32H7 Series, Version 1.3.2 on MacOS.
If we understand it correctly, the internal DFSDM clock f_DFSDMCLK which is used to drive the DFSDM module is configured by the RCC block and is derived from the system clock SYSCLK or peripheral clock PCLK2. According to [1], this internal DFSDM clock must be at least 4 times faster than the external serial clock, whereas the external clock is limited to 20 MHz.
According to [2], the INTERNAL clock is NOT limited to 20 MHz like the external clock, but to SYSCLK. But after enabling the DFSDM module in STM32CubeMX with 100 MHz for PCLK2 and for the internal f_DFSDMCLK generation, we always get the attached frequency limit error in the STM32CubeMX clock configuration window.
Is this a bug in STM32CubeMX or do we understand something wrong?
Thanks in advance and best regards.
Bernardo
References:
[1] STMicroelectronics: RM0433 Reference Manual - STM32H743/753 and STM32H750 advanced ARM®-based 32-bit MCUs, Rev 5, June 2018, p. 1102
[2] STMicroelectronics: STM32H743xI Data Sheet - 32-bit Arm® Cortex®-M7 400MHz MCUs, up to 2MB Flash, 1MB RAM, 46 com. and analog interfaces, Rev 5, July 2018, p. 176
