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pic & lcd questions

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aviv6371

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hi,
i m building lcd and pic based project and encountered few problems :
1. pic16f877a has 2 pins for vdd and 2 for vss. i checked them with voltmeter and they are shorted do i have to short them with wire ??
2. when working with 4 data line mode of the LCD do i have to connect the other unused lines of the LCD to vss ( 0 ).
3. when working at home how can i know if the oscilator is working. do i have any indication about the working or non working oscillator ??whats the right dc level suposed to be there ??

thanx in advance,
avi
 

aviv6371 said:
1. pic16f877a has 2 pins for vdd and 2 for vss. do i have to short them because they are already shorted ( i checked with vlotmeter ).

thanx in advance,
avi
Click to expand...

I think it's better to feed supply on both lines (short) to reduce noise.
aviv6371 said:
2. when working with 4 data line mode do i have to connect the other unused lines to vss ( 0 ).

thanx in advance,
avi
Click to expand...
You don't want to ground unused data pins of LCD.
you don't want to ground un used lines of your data port(PIC), but you can use
that port pins for other purpouse like switching, LED, or anything.
aviv6371 said:
3. when working at home how can i know if the oscilator is working. whats the right dc level suposed to be there ??

thanx in advance,
avi
Click to expand...

I didn't get the third question.

good luck
 

I think it's better to feed supply on both lines (short) to reduce noise
Click to expand...
why do i have to short the 2 lines of vdd and vss if they are internally connected ???

didn't get the third question.
Click to expand...

the third question was if have any indication to know if the oscillator is working or not without connecting led to ports .

thanx in advance,
avi
 

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