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- Can work without a reset pin
- Can work without the clock input(s) pin(s) (if it has an internal oscillator)
- Cannot work without the supply pins (including GND and positive rail)
- Is useless if you do not use the I/O ports pins (but can work internally)
- Needs at once the programming pins (to load the firmware)
From an interview POV:
I would go with:
A. The pin not used (You can always use it for something)
B. The pin not accounted for (If you used them all and find out later that you need one more! )
C. The Ground Pin (Designs may not work because of bad grounds)
D. The reset pin (CONNECT IT SOMEWHERE!!!!!!)
E. All the above
The question is really asked to find out how much ACTUAL hardware experience you have. If you haven't run across these problems yourself, then you might not have the experience the interviewer is looking for.
It is not a stupid question. I think DGND pin is the most important. Vague formulated questions need a different approach in order to show your knowledge at an interview. Lets take it one by one:
1) Vcc -the microcontroller can be supplied by IO pin (check the IO schematic)
2) POR - might have one internal
3) OSC - same as above
4) IOs - usually there are multiple
5) Programming interface pin - programmed at ATE time
6) .....
The basic pins which are required to operate a controller are:
Vcc(Vdd),Vss(GND),OSC1 & OSC2(crystal ocsr) & MCLR pin which is the reset pin of the controller.
Check the data sheet of the controller which you are using for the pin details.
Regards,
Jerin.
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