xtal problem.

[Rhatidbwoy]

I have PICBasic and I would like to know how you would define or declare in the program that you are using a xtal that is other than 4MHz

[Dave]

Rhatidbwoy, All you would do is place this define at the top of your program:

DEFINE OSC 20 '20 Mhz
DEFINE OSC 8 '8 Mhz

Dave Purola,
N8NTA

[mister_e]

and don't forget the configuration fuse... See FAQ to know how to set them in the code.

Usually.. XT = 4MHZ HS > 4 MHZ

[Rhatidbwoy]

ok got it.

the other thing is that I was speaking to a tech at Mechanique and he was talking about how the program does not really need that in it. That is the PICBasic using the MicroCode Studio. The one thing that I would have to do is to change the time constant commands by five when using a 20MHz Xtal

[Rhatidbwoy]

The other thing tha I would like to mention is that Define OSC 20 in PICBasic does not really give any other that error.

[Brewster]

I just went through a similar problem trying to change crystal frequencies.
This is what I found:

DEFINE is only available in PicBasic PRO.

In MicroCode Studio, you can change the oscillator type, XT, HS, R/C, etc.
After you have clicked on "compile and program", the next box to come up is "meProg-......". Click on VIEW and then CONFIGURATION ( you might have to click CONFIGURATION twice). The meProgram screen will come up and you can make changes to the oscillator there.

You will still have to compensate for a different oscillator frequency in your program.

Good Luck
Brewster............another newby