[time-nuts] Re: Microcontroller based frequency divider

From: use...@teply.info Sent: Sunday, May 1, 2022 1:34:56 PM To: time-nuts@lists.febo.com Subject: [time-nuts] Re: Microcontroller based frequency divider On 30.04.22 23:22, Simon Merrett wrote: > I know they were unavailable from one of my usual distributors when I checked > las

[time-nuts] Re: Microcontroller based frequency divider

On 30.04.22 23:22, Simon Merrett wrote: I know they were unavailable from one of my usual distributors when I checked last week. I also prefer surface mount parts and that narrows the availability somewhat but isn't a red line for me. I'm very open to the idea that the PIC12F was a one-off in

[time-nuts] Re: Microcontroller based frequency divider

precise time and frequency measurement > > Subject: [time-nuts] Re: Microcontroller based frequency divider > > I think the reason the PICDiv is so well regarded is because of the > specific chips used and the way the timers etc. are implemented in them. > > So, an altern

[time-nuts] Re: Microcontroller based frequency divider

I have a Raspberry Pi Pico implementation. With so many pins and state machines you can have up to 8 different frequencies. https://github.com/dorsic/PicoDIV .md > On 1 May 2022, at 00:46, Bruce Griffiths wrote: > > Modern CPLDs often have an internal

[time-nuts] Re: Microcontroller based frequency divider

Modern CPLDs often have an internal state machine that configures the chip on power up. Not all of these shutdown the internal state machine clock after configuration is complete. Crosstalk from the internal clock/oscillator will modulate the output of a divider. IIRC the Coolrunner II chips

[time-nuts] Re: Microcontroller based frequency divider

Simon, You can probably use any microcontroller as a divider, including Atmel/AVR. Most modern processors have elaborate timer / counter / PWM / NCO features on-chip so you can avoid the archaic cycle counting technique used in all the PIC dividers [1]. Or you can use decade counter IC's or

[time-nuts] Re: Microcontroller based frequency divider

Am 2022-04-30 21:33, schrieb Clint Jay: I think the reason the PICDiv is so well regarded is because of the specific chips used and the way the timers etc. are implemented in them. So, an alternate chip outside of the Microchip PIC range just might not be capable of the performance. For

[time-nuts] Re: Microcontroller based frequency divider

. If there are other contenders I'd be happy to look at them too. Simon From: Clint Jay Sent: Saturday, April 30, 2022 8:33:17 PM To: Discussion of precise time and frequency measurement Subject: [time-nuts] Re: Microcontroller based frequency divider I think

[time-nuts] Re: Microcontroller based frequency divider

I think the reason the PICDiv is so well regarded is because of the specific chips used and the way the timers etc. are implemented in them. So, an alternate chip outside of the Microchip PIC range just might not be capable of the performance. Are they in short supply? On Sat, 30 Apr 2022 at