Must I need crystals?

Status
Not open for further replies.
L

littletransistor

New Member
hey there,

I'm making some PIC projects, with these chips 18F1320 and 16F628 where they have those built-in oscillators already. Should I need to put them again or just leave it without the crystal?

And I only have 32.768KHz crystal - I heard some PIC needs that.
 
You don't need a crystal unless your project requires an accurate system clock speed.
Projects that need a crystal:
Clock
Frequency counter
etc

Projects that normally don't:
Led flashers
Alarm system
dice game
etc
 


You probably don't need a crystal, but it depends on what you are doing with these chip. The present day internal oscillators are fairly accurate and can do serial comms....

What do you have planned?
 
Oh, just making simple projects like LED flashers, music, some games. So I don't have to use these at all?

Also, maybe I'll be using the LCD panel - clock and some monitoring stuff.

I might be venturing into stepper motors too.
 
littletransistor said:
Oh, just making simple projects like LED flashers, music, some games. So I don't have to use these at all?

Also, maybe I'll be using the LCD panel - clock and some monitoring stuff.

I might be venturing into stepper motors too.
Click to expand...
None of that stuff except the clock needs the extra accuracy of a crystal. So as long as your PIC has an internal oscillator that gives you enough speed to suit, go ahead and use it.

There are some PICs that don't have internal oscillators. Those ones will need a crystal or other type external oscillator.
 
i don't recommend resonator for timing intensive application...ie USB or serial....i also heard that they don't last long when compared to real crystal....i love crystal+driving caps*2.......but if there's too space limitation...resonators are still good enough
 
Status
Not open for further replies.

Similar threads

Crystals, Oscillators and External Clock Sources – A Brief Tutorial from EEVBlog
Replies
0
Views
2K
For The Popcorn
Need some heads.. Logic problem I have spent days on
Replies
12
Views
4K
Nigel Goodwin
H
  • Question
I need help again
Replies
16
Views
2K
Ian Rogers
H
  • Question
I need urgent help
Replies
12
Views
2K
Ian Rogers
P
How do I get 64MHz on 18F25k22
Replies
10
Views
1K
Pommie
P
Menu
Log in
Register
Cookies are required to use this site. You must accept them to continue using the site. Learn more…