Using internal Oscillator w/PusbuttonLEDtest

Apies16

Hello,

I am new to working with the Propeller kits, I don't have the 5MHz crystal and was wondering what I would need to change in the PushbuttonLEDtest code to have the chip use its internal oscillator? I am ordering another crystal but until it gets here I would love to know if there is another way to go!

Thanks bunches,

April

Ok, so it took me a second to realize the code below set the chip to use the external crystal. Got it working with the internal, yay!!!! The Propeller Education Kit Labs: Fundamentals book states that up to a certain point before talking about clock and frequency that the programs used before this point (pg 53) were using the internal clock. I deleted the code below and it works.

_clkmode = xtal1 + pll16x ' Feedback and PLL multiplier
_xinfreq = 5_000_000 ' External oscillator = 5 MHz

Duane Degn

I think the Prop uses RCSLOW if there isn't a clock mode statement. Edit: See Tracy's post below.

You can use RCFAST by including this in the beginning of your code.

_Clkmode = RCFAST

RCSLOW uses less power than RCFAST (but is slower of course).

_Clkmode = RCSLOW

I don't recall the what the clock rates are at these settings but I'm sure the information is in the Propeller Manual.

As you may know the internal oscillator isn't very precise.

Tracy Allen

Actually, the opposite. It comes up by default in RCfast at about 12 MHz. The RCslow instruction takes it down to 20kHz.