Roman,
 what is the motivation of the posting?
Have you limited PCB area, or you just don't want
to mess with extra pins?
If dimensions are critical: you may use chips in
new ultra small packages(japanese microcontrollers,
if available).

 Mike.

Roman Black wrote:
> Has anyone else ever desired a 3-pin PIC, or
> better still, ever seen/used a 3-pin micro??
>
> I'm imagining something the size of a TO-92 (small
> plastic transistor) or 3-pin SMT device, with
> 2 power pins and a single I/O pin.
>
> A simple pullup resistor on the I/O pin would allow
> it to transmit and receive digital at the same time
> on the one pin, so it could drive a constant PWM
> signal out (to operate a motor or SMPS etc), and
> at the same time receive serial in from any source.
>
> Internally it should have a precise osc with on-chip
> resonator so it can be used as a programmable
> real-time clock, or a timed controller system.
> And some internal eeprom... How much was it again
> to get a batch of custom chips made?? :o)
> -Roman

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