I want to have 60 MHz on the MCO1 pin PA8. I use an external 25 Mhz crystal. The PLL delivers 180 Mhz to the system clock. I've used STCubeMX to configure the clocks to get 180 MHz / 3 on MCO1.
Unfortunatly I'm not getting any activity on the MCO1 pin at all.
Some things I've tried:
- Checking the registers in the debugger, looks correct.
- Setting MCO1 register to 0x02 for using HSE. This works fine, I'm getting pulses on MCO1
- Setting PLL down to 75 Mhz. No activity on MCO1.
Is this some limitation or erratta that I somehow missed in the documentation?