are Vdd and Vss connected internally?

karenhornby said:

ON a 16F877 it has 2 X Vdd and 2 X Vss

are both Vdd pins linked internally inside the chip, and are both Vss pins connected internally inside the chip?

OR do I have to supply Vdd and Vss to 4 pins instead of 2??

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Hero999 said:

Perhaps the largest thread that deals with this question could be made sticky?

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Shax said:

I'm using a 18F2431 in an electronic altimeter, which has Vdd, Vss and AVdd, AVss. All pins have to be connected to the relevant supply rails for me to be able to program and use the device.
A quick look at the datasheet (397 pages!!! ) suggests that they are linked, but reality proves otherwise!

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Pommie said:

That is what I would expect, digital and analogue supplies to be isolated. In the OPs case, the pins are connected internally and it depends on the current flow to/from the ports whether both need connecting.

BTW, are you sure you need the analogue supplies connected to program?

Mike.

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