Why do we need two power supplies and two ground pins for PIC ?
For eg, in PIC16F877A, Pins 11 and 32 must be connected to +5V, and 12 and 33 to ground...
But why do we need 2 of them ???
My lecturer told me something about Ground bouncing, etc. caused because of some conditions, when many pins are grounded at the same time...and due to some EMI effects caused because of the self inductance of the pins.
ANSWER:
On some devices there are separate power supply pin called AVDD & AVSS. It is used for the Analog to Digital Conversions,where AVDD & some times AVSS to be connected to a precise voltage source. But on some devices if this feature is not available, to maintain same pin configurations of the family it is to be used just as VDD & VSS.
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