shutting down "spare" Cortex-M4

[BradWalker]

I've taken over this project that is using the STM32h755 CPU. The software is not currently using the Cortex-M4 processor inside the chip. I'm reworking the software so that it will be able to use it sometime in the future. But, until then, I was hoping to "turn off" the M4 to save power.

I think there is something about disabling the clocks in the RCC register for the M4 cpu. But, uncertain as if that is the propery way to go about this.

I could references to software or places in the documentation.

Thanks. 

[SofLit · Accepted solution]

You can disable CM4 with option bytes with CubeProgrammer, so you will be in Single core config:

[BradWalker]

Thanks. As I'm new to the STM32 line, I was unsure where to find it.