I'm designing some PCBs for special use cases and I have to do something I'm not so experienced.
I need a relatively powerful MCU with the capability of running at its maximum clock speed with the following criterias:
-Has to use internal RC oscillator
-Needs to be able to work between 2-3.6V
-Has at least 4 timers, 2 of them needs to be 16 bit
-At least 48MHz clock speed
-At least the stated amount of serial peripherals:
edit: If possible, in a 48 or 64 pin package.
I need something that is Arduino compatible (for fast prototyping) and I'd love if it used UPDI, because I don't want to waste an SPI connection for ISP programming.
My plan is to use an external, compensated 32.768KHz clock for calibration, that would be connected to a timer and another timer that's running from the internal clock and comparing them from time to time. In case there is auto-calibration, I'd be more than happy.
I tought about some atmel SAM series chips but the officially supported ones don't seem to be able to run at their maximum speed from internal oscillator.
I hope there is something out there.
Looking forward to seeing your answers!