Re: [time-nuts] Automatic switching of a µC osc. to external 10MHz reference as clock?

2012-09-12 Thread Brooke Clarke
Hi Peter: Many of the Microchip PIC uC have a lot of flexibility in this regard. I used it on some of the clocks I made. http://www.prc68.com/I/PRC68COM.shtml#07092006 Have Fun, Brooke Clarke http://www.PRC68.com http://www.end2partygovernment.com/2012Issues.html Peter Krengel wrote: Hello

Re: [time-nuts] Automatic switching of a µC osc. to external 10MHz reference as clock?

2012-09-12 Thread Chris Albertson
On Tue, Sep 11, 2012 at 6:31 PM, Kevin Rosenberg ke...@rosenberg.netwrote: On Sep 11, 2012, at 4:42 PM, Peter Krengel krengelda...@gmx.de wrote: I'm looking for a possibility to make an automatic switching between the internal µC oscillator (Atmel µC) to the 10MHz output of my thunderbolt

Re: [time-nuts] Automatic switching of a µC osc. to external 10MHz reference as clock?

2012-09-12 Thread Bob Camp
Hi Some chips (dspic33's for example) have oscillator fail protection. You blow the magic fuse bits and when the TBolt isn't giving you a clock the micro drops back to the internal R/C oscillator. It's magic Bob -Original Message- From: time-nuts-boun...@febo.com

Re: [time-nuts] Automatic switching of a µC osc. to external 10MHz reference as clock?

2012-09-12 Thread David
On Wed, 12 Sep 2012 00:42:48 +0200, Peter Krengel krengelda...@gmx.de wrote: I'm looking for a possibility to make an automatic switching between the internal µC oscillator (Atmel µC) to the 10MHz output of my thunderbolt to use it as a precise µC clock. Has anybody an idea how to do best

[time-nuts] Automatic switching of a µC osc. to external 10MHz reference as clock?

2012-09-11 Thread Peter Krengel
Hello guys, I'm looking for a possibility to make an automatic switching between the internal µC oscillator (Atmel µC) to the 10MHz output of my thunderbolt to use it as a precise µC clock. Has anybody an idea how to do best without disturbing the accuracy of the ref. signal? Thank you in

Re: [time-nuts] Automatic switching of a µC osc. to external 10MHz reference as clock?

2012-09-11 Thread Hal Murray
krengelda...@gmx.de said: I'm looking for a possibility to make an automatic switching between the internal µC oscillator (Atmel µC) to the 10MHz output of my thunderbolt to use it as a precise µC clock. Has anybody an idea how to do best without disturbing the accuracy of the ref. signal?

Re: [time-nuts] Automatic switching of a µC osc. to external 10MHz reference as clock?

2012-09-11 Thread Kevin Rosenberg
On Sep 11, 2012, at 4:42 PM, Peter Krengel krengelda...@gmx.de wrote: I'm looking for a possibility to make an automatic switching between the internal µC oscillator (Atmel µC) to the 10MHz output of my thunderbolt to use it as a precise µC clock. Has anybody an idea how to do best without