So I'm suppose to make a counter that output 0 to 99 using PIC16F690 with two 7 segments. Btw I'm using Flowcode v5. I put the ones digit at Port C(with 8 bits) so no problem on that part but I'm having a problem in tenths digit. I put the tenths digit at Port A (with 6 bits). My main concern is one segment doesn't lit (e.g. The display should be '9' but segment A doesn't lit up). Any suggestion?

 

Multiplex the digits.
http://ww1.microchip.com/downloads/en/appnotes/00529e.pdf

 

You only need 7 bits per digit if you are not using the decimal point.

 

You only need 7 bits per digit if you are not using the decimal point.

Yes, I just mentioned port c has 8 bits (0 to 7 bit) just in case.

 

That thing has 20 pins. You need 14 of them. What the problem.

 

Any suggestion?

Yes. Stop trying to use RA3 as an output. It's input only.

That thing has 20 pins. You need 14 of them. What the problem.

See the first post of this thread. Problem:

So I'm suppose to make a counter that output 0 to 99 using PIC16F690 with two 7 segments. Btw I'm using Flowcode v5. I put the ones digit at Port C(with 8 bits) so no problem on that part but I'm having a problem in tenths digit. I put the tenths digit at Port A (with 6 bits). My main concern is one segment doesn't lit (e.g. The display should be '9' but segment A doesn't lit up). Any suggestion?

 

Can you tell which bit can i put the tenths digit?

 

Well, RB4, RB5, RB6, RB7 all seem to still be free. You could use any of them. You have a 7 segment connected to 8 bit Port C, so there would seem to be a free bit there too.

I do not know how you drive a 7 segment display off 6 pins.

 

Well, RB4, RB5, RB6, RB7 all seem to still be free. You could use any of them. You have a 7 segment connected to 8 bit Port C, so there would seem to be a free bit there too.

I do not know how you drive a 7 segment display off 6 pins.

Unfortunately, only one port should be use in driving 7seg in flowcode v5. If I change one pin into portb, all pin will become port b too.

 

Unfortunately, only one port should be use in driving 7seg in flowcode v5. If I change one pin into portb, all pin will become port b too.

So multiplexing solves the problem. All segments on one port and any other pin to alternate the digit drives.

 

So multiplexing solves the problem. All segments on one port and any other pin to alternate the digit drives.

I don't see how that works. If you don't want to do OP's homework for them, could you please send me a more detailed explanation or direct me to website/blog that talks about it.

 

I don't see how that works. If you don't want to do OP's homework for them, could you please send me a more detailed explanation or direct me to website/blog that talks about it.

I did already, but here's another. This is about using an FPGA but the method applies equally to uC.
http://fpga4fun.com/Opto4.html

 

I don't see how that works. If you don't want to do OP's homework for them, could you please send me a more detailed explanation or direct me to website/blog that talks about it.

I have an example of multiplexed seven-segment displays here:

http://forum.allaboutcircuits.com/blog/msp430-multiplexed-7-segment-displays.559/

 

I did already, but here's another. This is about using an FPGA but the method applies equally to uC.
http://fpga4fun.com/Opto4.html

Thank you.

 

I have an example of multiplexed seven-segment displays here:

http://forum.allaboutcircuits.com/blog/msp430-multiplexed-7-segment-displays.559/

Ok. I see it now. I was afraid that the digits would be flickering. But I see that it can actually be avoided. Thank you very much. And yes, it seems to me that Albert is right, the OP needs to use this multiplexing technique for their assignment.