Hello,
First of all quick apologies for sending an email last week without deleting all the old information from previous postings. I have been playing around with producing 32.768 kHz from 10 MHz using a PIC chip. I have a real time clock calendar chip that requires a 32.768 kHz crystal. I want to feed it with 10 MHz signal instead, so it is synchronised to my main 10 MHz in a frequency standard I am designing. The method I’m using has been documented before where we have two loops running 9632 times through a 39 instruction loop and 55904 times through a 38 instruction loop, each time toggling the output pin. I have done this and am getting approximately 32.768 kHz with the FM modulation as described by previous authors. My question is should I expect exactly 32.768000000 kHz (obviously assuming we use the same 10 MHz to drive the divider and all test equipment)? The closest I can get the 32.768 kHz is within about 0.1 Hz. Does the actual model of PIC chip influence the accuracy? Regards Martyn _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
