I have been trying so long to make the correct schematic that would make the AT89C5131A-M QFN32 enumerate correctly, but without success. I always get USB Device Not Recognized on windows and all zeros on USB View.

I read the datasheet deliberately and implemented the schematic in section 4.1 in the datasheet exactly, but without success. Have anyone tried the QFN32 packaging? It misses many lines.

I connected a capacitor on the reset line as suggested on the datasheet. What should be the value of the capacitor?

In the QFN32 we do not have the PSEN line.
What should be the value of the crystal? Do I need to connect the Port 1 lines to some specific value in order to set the Hardware Security Byte?

Thanks for your help.
Hani.