We are trying to increase the clock speed of our STM32 on our custom board but we encountered some difficulties.
At the moment, we set a clock of 56 MHz, using HSI and an PLL of 112 (with CubeMx). It works fine.
But when we set a clock of 96 MHz by setting the PLL to 192, we get Hard Fault, Usage Fault or Bus Fault when debugging.
We tried increasing the flash latency, but it does not work better. The power supply seems good (around 3,2 V).
We were missing the Vcap on the board, but we fix that. Not better.
What can we look at to debug this problem ?