[sdiy] Synthex Oscillator

[Gordonjcp]

On Sat, Jul 08, 2017 at 02:01:58PM +0100, Tom Wiltshire wrote:
> > 
> > Isn't it a nine-bit counter (the flipflop that toggles the LSB every
> > second "count") followed by a selectable "post-scaler" with three range
> > selection bits, or am I grossly misreading it?
> 
> Yes, 9 bits, but more like an 8.5 bit divider - alternate odd and even counts because of that flip flop you've pointed out. And then followed by a postscaler with 8 options.
> 
> The quirk is that NOR gate. The "postscaler" isn't fed from the first counter. Instead it is clocked directly by CP1, and CP1 is NOR'd with the output from the first counter. That makes the effect of the first counter a lot less obvious than it at first appears.
> 
> Tom
> 

Okay, the way I saw that, it just gates the final output of the pitch
divider to be the same as the incoming 4MHz clock?

-- 
Gordonjcp MM0YEQ