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Home Forums 68kMLA Why the unusual frequency? — #11
Post #11 by MarkS
Source Forum68kMLA
CategoryHardware
Post DateTue, 3 Nov 2009 - 18:06
Original URLhttps://68kmla.org/bb/threads/why-the-unusual-frequency.18919/
Post
I think the "16MHz" quoted for the Plus is probably nominal (ie near enough) and is actually 15.6672MHz
Oscillators with a 7.8336 frequency and its multiples are extremely hard to find. I found a 31.3344 MHz oscillator and will run the Prop off of that. I'l use the Prop's built-in PLL to double this frequency to 62.6688. The software written for the Prop is typically designed to work at or near 80 MHz. There is plenty of example code (called Objects) in the Propeller Object Library that will greatly simplify the coding of this. Not that the coding would be all that hard anyway. I'm also adding a USB keyboard to Mac keyboard converter as well as a USB mouse to Mac mouse converter. Each of those converters will have their own core.

mp.ls