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gee Mike that sounds a lot easier than when I added a PC 8bit quad UART to a PIC16F877...back when the 'big animals' roamed......
sigh...
sadly I still have 2-3 tubes of 4052, 4051 and 4053...coll ...

Back in the dinosaur days I drove 4 UARTs from a PIC with only 1 UART port.

I used a CD4052 as an expander for both transmit and receive at TTL level.

Needed 2 spare pins to select which UART to ...

Can we measure frequency with timer0? Is there sample code.

CCS supplies code EX_FREQ.C which is not portable between PICs.
You may be able to modify it to suit your PIC.

This link may help you ...

Examples supplied by CCS shows you how to do it.

You've been around for eight years, you should not need to be asking.

Mike

Try printing out the values of all variables which change as you go line by line through the code.

Should tell you where the error is!

Mike

Will something along the lines of (not in CCS code):-

if i> stop then i = start;
if i< start then i =stop;

Someone here may have a clever way of reducing it one line of code.

Mike

We've met before and I still have no intention of writing code for you.

Maybe this will help.

1st line LCD___________Time setting 12:45
2nd line LCD ___________UP__DN__ENTER

Your three butt ...

It's simpler to use only 3 buttons.

Your text for a page or up/down is on the top line of the LCD.

Each button is equally spaced below the bottom line.

The text above each button indicates it ...

Or you could try something like standard keyboard method where you recognise the difference between a sharp tap and a longer hold for auto-repeat.

There must be loads of examples out there.

Mike

Forget proteus/ISIS, unlikely anyone here can help.

Use real hardware instead.

Mike

There are many examples on this forum.

Several use Timer1 as input.

Either way if your code is correct you will inevitably 8MHz, whether your clock is really in the low MHz or high tens MHz.

...

What is the order of magnitude of the variation in your ADC readings?

Using a 'scope how does it compare with the ADC reference noise and the noise at your ADC input?

Mike

I guessed the typo for the resistor was 4.7K then tried 47K.

Like PCM says, it's not a typo.
It's a convention that's been around since 1952 as part of BS1852, and later modifications.
The purpos ...

What sort of errors are you getting?

Are they random?
Always too low / high?
Similar range for both Rb0 and Rb1?

Mike

EDIT Where in your code have you initialised the counts for pulseWidth( ...

CCS provides sample programs for both sending and receiving characters.

I prefer to work with ASCII characters so that I can use a PC to sniff at the data and be able to easily read what's happenin ...