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i have 4 micro with 50 MHZ clock speed that control 4 brushless motor in one pcb
Hi elec4,
this question is not possible to answer, because it depend what ground it is. Number 1 priority should be to separate analog and digital. Then to avoid that bigger switching current creates ground shifts for the micro(like from the motor commutation) or noise on the micro supply lines. In worst case an isolation between power switching and the micro is needed. If the GND and VCC lines having noise or spikes it will force the micro to be reset or even worst it changes RAM or register values. There a plenty of PCB design documentation of the web if you down have them already.
Enjoy your design work!
Depending on which stuffs are you driving, you have to concern much more on splitting the power GND from the analog/digital grounds ( indeed, each one appart from another ) in distinct regions, but electrically connected. By the way, based on the picture above, are you placing 2 horizontal connectors for the external power devices in the middle of the board ?