I would like to know what is the fastest crystal that I could use with the prop
jmbertoncelli@USA
Posts: 48
Hello,
I would like to know what is the fastest crystal that I could use with the prop proto board?
My current program setup is:
_clkmode = xtal2 + pll16x
_xinfreq = 5_000_000
what about:
_clkmode = xtal3 + pll16x
_xinfreq = 5_000_000
I tried to use xtal3 + pll16x but nothing work I guess that the crystal is not fast enough????
thanks a lot.
jm.
I would like to know what is the fastest crystal that I could use with the prop proto board?
My current program setup is:
_clkmode = xtal2 + pll16x
_xinfreq = 5_000_000
what about:
_clkmode = xtal3 + pll16x
_xinfreq = 5_000_000
I tried to use xtal3 + pll16x but nothing work I guess that the crystal is not fast enough????
thanks a lot.
jm.
Comments
Leon
▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
Amateur radio callsign: G1HSM
Suzuki SV1000S motorcycle
Here's a good link for Oscillator speeds and options that could work for you.
propeller.wikispaces.com/Oscillator
OBC
▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
New to the Propeller?
Getting started with the Protoboard? - Propeller Cookbook 1.4
Updates to the Cookbook are now posted to: Propeller.warrantyvoid.us
Got an SD card? - PropDOS
Need a part? Got spare electronics? - The Electronics Exchange
jm.
The fastest speed the Propeller can be clocked is determined by it's operating temperature. The datasheet shows the frequency vs temperature, please note the indicated line is the failure point, not an indication of an achievable speed (unless you don't care if you Propeller doesn't always work). So you will need to derate this value (lower the frequency to ensure the Propeller will always work). At room temperature the highest people have been able to get it to reliably operate is 7.3728 MHz crystal wound up by PLL16x.
However, just like overclocking your computer, we make no guarantee of operation above 80MHz.
▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
Paul Baker
Propeller Applications Engineer
Parallax, Inc.
Anyone know where to readily get a 6.25 MHz crystal that works for the Prop??? No one seems to carry 6.25 MHz.
Thanks!
John
http://www.quartslab.com/
Leon
▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
Amateur radio callsign: G1HSM
Suzuki SV1000S motorcycle