On Wed, 12 Mar 2014 11:48:04 -0400, d0ct0r wrote: > LCD connected to the same MCU. And it has relation to the core clock > too. So, nothing on LCD before I reset entire MCU. I think initial > incorrect core clock reading cause a lot of issues. Probably my only > option will be to implement some external relay and timer to turn on MCU > few seconds after OCXO. Or may be to put 10Mhz oscillator to PCB and > connect OCXO output in parallel to it (not sure if its good idea or it > will works).
You could start the MCU up on the internal clock , write to the lcd , wait 5 sec. And then switch to the external clock. Btw: Is the Ext clock input on the STM fed directly from the OCXO ? Can the STM handle the OCXO voltage swing ? If you have a conditioning circuit betewwn the OCXO and the STM , i'd like to see it. As i have the need for one , trying to interface a 5v OCXO to a NXP 1114 Arm , that wants max 1.8v in the clockinput. CFO _______________________________________________ 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.
