I am routing a development board for STM32F030R8T6 which can use external 8 MHz crystal. Here are the schematics and board for the crystal part:
Crystal traces are routed on bottom layer (blue color).
Initially I have worked with atmega and I never saw a resistor in a crystal circuit. What's the role of R5 (390 ohms) in this crystal circuit?
I have tried to keep other gpio traces away from crystal traces but a few of them are going over them on the top layer. Should I be concerned?
Also, the traces originating from pin 17-30 have too many twists and turns. Will it create any issues during the fabrication process? I am using 10 mil traces.