Today I built the MC9S08SH8 Si570 controller and it works beautifully. The same software runs in both versions. Push in the encoder and roll to the digit of interest including memory address. Release the encoder and tune your radio up and down to your hearts content from 1 Hz to 999,999,999 Hz. These controllers do the same math as in the SI spreadsheet. They read the NVM parameters at startup and compute the local crystal freq based on the published startup freq. All calculations are performed in 64 bit double precision floating point math. What more could you ask for :-) Set that Si570 right on the button per your personal chip. There are 1024 memory locations. The first four are user storable parameters including F0 startup freq for any Si chip, Rocky offset value to move the actual freq off the zero spike, Startup memory address, and Startup digit position. Holding in the encoder for 2 seconds stores the current frequency to the current memory address and advances the memory address to the next empty ( zeroed out ) memory for storing a string of frequencies. If you press the encoder in while powering up and hold it for 5 seconds which counts down on the LCD, the memory is initialized to my favorite values and the rest are zeroed out :-) All this with one encoder and it's pushbutton :-) There is even better news. Thanks to Jean-Michel in France we might be able to eliminate the 74HC906 and wire the 3.3v QG8 directly to the 5volt LCD interface. He tried it and it works. That means anyone can program their MC9S08QG8 chip with their USBSPYDER08 ($29) and be in Bidness ( as in Awl Bidness, I am from Texas you know ). Unfortunately the MC9S08SH8 must be programmed with the USBMultilink ($99). However I might be able to provide chips. But for now I am leaning to the more readily available and .50 cent cheaper MC9S08QG8 for everyone. I bought my 16x2 display for $2. That's my story and I'm sticking to it :-) Have a Nice Day and thanks for the Bandwidth. I'll be demoing them both tomorrow at the monthly AQRP meeting.
-- Regards, John ========================================================= email: [EMAIL PROTECTED] photos: http://www.flickr.com/photos/k5jhf/sets/ videos: http://www.youtube.com/profile?user=k5jhf files: http://briefcase.yahoo.com/[EMAIL PROTECTED] web page: http://www.geocities.com/[EMAIL PROTECTED] call sign: K5JHF =========================================================
