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Quartz oscillator is far more simple (1 decoupling cap is needed) no critical components placement, accurate trimming, low cost.

I thought about it long time ago. Many doubts. Simplicity is questionable. You need additional power trace. In case device sleeps this line should be controlled too - so two uC pins anyway. Operational current is comparable with consumption of the whole device without oscillator. Sharp edges on several MHz - additional EMI considerations (maybe I am wrong). So my ancient conclusion - not for every project.

<...>are available from the shelf for very low cost

I should check if they are actually very low priced now. Thank you for pointing.

The size is wrong.

By the way, size reflects power, max power determines max Vp-p, that could be not enough for work or reliable work of given generator in uC, that usually depends on supply voltage.

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Hi
Your approach to writing software is wrong.
for generating precise timing should involved using hardware timers - not general software loops or diving to assembly language.
The STM32 timer are sophisticated hardware, some time hard to configure - but if you read the ST timer book you will be able to do it.
if the timer resolution is not enough for you you can choose STM32 with high resolution timer like the STM32G4xx who can go down to nsec resolution.     
I have done a similar project using the hardware timers to produce a full bridge control  - and it work very well using 2 timers only.
in the G series you have 8 timers (more then enough.....)

The DsPIC is far more degraded microcontroller in compare to STM32 where all high end software(timing , DSP ....) must be written in assembly language, language I abandoned long time ago when I switch from 8051 to MSP430. 


All the best

Bobi

One question - are you plan to manufacture your design by the +100,000 unit?
Whether the answer is yes - I rest my case , but whether the answer is no :

Why do you use Quartz resonators when Quartz oscillator are available from the shelf for very low cost
using Quartz oscillator is far more simple (1 decoupling cap is needed) no critical components placement, accurate trimming, low cost.

All the best

Bobi       

#2 has no ground connection for the 2 caps, the vias look like they are not metallized.
#1 I'm not sure but here the vias look metallized, there might also be a ground connection on the top left under some part or screw?

All vias are ok. Both are "working" oscillators in fact. My previous message was the answer on my own question "what is wrong?". The size is wrong.

Finally, my conclusion is that ARM architecture may be sophisticated but for reliable precise timings I would always choose some dsPIC or simillar "classical" microcontroller.

Yes and exactly for this reason I still choose general purpose modern microcontrollers ( like Microchip Midrange/enhanced Mid range  and even some single clocker 8051s) for low to medium complexity projects and they delivers well what is expected of them . The "predictability" aspect is really very simple in these MCUs as you are very close to the guts of the MCUs ...

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