ECIO40P16 and dsPIC33EP256MU806 chip

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kennethnilsen69
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ECIO40P16 and dsPIC33EP256MU806 chip

Post by kennethnilsen69 »

I have make my own pcb with the same chip as in ECIO40P16 and there are a few things I do not understand

ECIO40P16 has an external crystal at 8MHz but runs at 140MHz. how is this possible?
Mine only works properly if I choose 8MHz but as you know, it is much slower than 140MHz. so what is it I have not understood here?

I also can't use USB to upload the Hex file. I have to use PICkit4. any tips on how I can do this? I have uploaded the same bootloader that must be used on ECIO40P16 for the USB upload to work.

If I erase the ECIO chip, it stops working with USB. and when I upload the bootloader the USB works again. so I know the bootloader is working properly.
But on my pcb it will not work. is unsure if this has anything to do with the crystal. any ideas?
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