[time-nuts] PLL suggestions

[Adrian Godwin]

Even with a smaller device it's possible : you can sometimes
repurpose crystal and reset pins to be I/O, do a software SPI, and set
registers using write-only methods (MOSI but no MISO connection) to get
down to 2 or 3 pins used.

On Wed, Jan 1, 2020 at 1:54 PM Graham / KE9H <ke9h.graham at gmail.com> wrote:

> On Tue, Dec 31, 2019 at 9:38 PM Bob kb8tq <kb8tq at n1k.org> wrote:
>
> > Hi
> >
> > The gotcha with a 6 pin package is that it is unlikely to have a (4 pin)
> > SPI interface.
> > Pretty much every PLL chip in the universe is SPI.
> >
> > Bob
> >
> >
> Bob:
>
> I think things are more powerful than you think.
>
> For example, check out a PIC16F18313, 8 pin SOIC-8.
> 6 I-O pins, mappable through a pin-mux.
> Includes ADC, DAC, 3  Timers, UART, I2C, SPI, 2 blocks of user configurable
> logic, and an on board CPU master clock good to 1 % over temp and voltage.
>
> $0.75 in quantity 1 !
>
> So, all of that for less than a 555 timer IC.
>
> You don't have enough pins to get at everything simultaneously, but no
> problem configuring a PLL over a SPI.
>
> --- Graham
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