[sdiy] Divide by 10^6?

[Magnus Danielson]

flightofharmony wrote:
> Hello everyone,
> 
> I have a question for the logic & digital folk: is there a
> low-component-count, off-the-shelf way to divide down from 20MHz to 20Hz?
> I'm trying to add a clock rate LED to the Sound of Shadows delay module
> prototype I'm working on. A cascade of six 74*90 ICs works fine, but that's
> a lot of board space just to blink an LED.

The timing community uses a PIC for this purpose, and Tom van Baak has a 
design that several has cloned that does the trick... but from 10 MHz to 
100 kHz, 10 kHz, 1 kHz, 100 Hz, 10 Hz and 1 Hz. If only the PIC can 
handle 20 MHz the 10 Hz output would hit 20 Hz.

Boardspace is much better. Several people have retarget this design to 
similar PICs with good result.

http://www.leapsecond.com/tools/PPSDIV.ASM

Cheers,
Magnus