I wanted to get the Simple Commands decoder into the public domain and decided TIC232 was a good way to show off changing a single variable by serial port command as a minimum implementation. I thought the time-nuts might get a kick out of the TIC as it is so simple a solution and yet highly accurate. And if you are willing to wait long enough, the averaging time and counters can be extended for whatever resolution you might desire. Having all those unused pins on the TIC also lets you control other devices in the system by serial port commands and really simplifies some designs. And yes, both Simple Commands and TIC232 are now public domain, so feel free to "cut and paste" to your heart's content. Enjoy!. ----- Original Message ----- From: Brooke Clarke To: Richard H McCorkle Sent: Friday, August 11, 2006 12:35 PM Subject: Re: Fw: [time-nuts] TIC232
Hi Richard: I've been scratching me head trying to come up with a way to measure Time Intervals with 1 ns resolution for some time. Your averaging based on Timer 1 and a seperate 16 Mhz clock is a great idea! I've been working on what I call a precision clock for years and the current version uses a 16F88 that gets it's Fosc input from a 10.0 Mhz frequency standard. It also generates a 1 PPS output and this morning I got the code working that allows moving the edge of the 1 pps in 1 ms steps. I am planning on a SYNC function like is in the tvb divider. Now it looks like with the addition of an external 16 MHz unit oscillator I can display the offset from the GPS 1 PPS input. For some more about the Precision Clock see: http://www.pacificsites.com/~brooke/PRC68COM.shtml#PC3 Am I correct in thinking your code is in the public domain? Have Fun, Brooke Clarke -- w/Java http://www.PRC68.com w/o Java http://www.pacificsites.com/~brooke/PRC68COM.shtml http://www.precisionclock.com Richard H McCorkle wrote: ----- Original Message ----- From: Richard H McCorkle To: Brooke Clarke Sent: Friday, August 11, 2006 11:34 AM Subject: Re: [time-nuts] How do I know my GPS stabilized oscillator is working? The corrected address is http://www.piclist.com/techref/member/RHM-SSS-SC4/TIC232.htm, and the resolution is set by the 16M osc and time interval chosen for the report. Time intervals from 1-256 secs are set by serial command, with resolution = 1 / XO speed / sample time. Default is a 60-sec averaging time at 1.04ns per update. ----- Original Message ----- From: Brooke Clarke To: Richard H McCorkle Sent: Friday, August 11, 2006 11:27 AM Subject: Re: [time-nuts] How do I know my GPS stabilized oscillator is working? Hi Richard: I've been looking for a Time Interval counter, but the Piclist link below seems to be broken. Do you have a schematic for the TIC232? What is the smallest interval it can see? Have Fun, Brooke Clarke -- w/Java http://www.PRC68.com w/o Java http://www.pacificsites.com/~brooke/PRC68COM.shtml http://www.precisionclock.com _______________________________________________ time-nuts mailing list [email protected] https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
