Quote Originally Posted by iugmoh View Post
ok what is the suitable PIC IC needed with crystal to achive this problem
FASTER...that's all...FASTER! Read the Tables and you'll see what I mean.
A serial link can tolerate X amount of error. So, find the combination of oscillator speeds and serial communication speeds that works for your unique situation.
I can't help you much more than that...I don't think anybody can...until you do some reading and comprehending the information involved.
The 16F877A will run at 20Mhz (possibly a bit faster), the 18Fxxxx series will run at 40Mhz (55Mhz in my experience, but not recommended for reliability). Either of those chips that you have been relating to in your threads will work just fine.
You need more crystals! More oscillators! More freq! More cycles per second! More HERTZ! More variances of direct current per unit of time!
That's all!