On Fri, January 20, 2012 2:34 pm, YES NOPE9 wrote:
> I thought Vpp could be operated at "normal" voltage levels.
> Perhaps the 10F322 does not have enough memory.
> It appears that only two digital pins are required ... so perhaps
> RA0-Out and RA3-In can be the serial port.
> RA1-IO and RA2-IO can drive the programming for the second module.

For programming you actually need 3 I/Os- MCLR/VPP, PGC (clock), PGD
(data). The MCLR/VPP gets you into programming mode, but the data is sent
over the PGC/PGD pair. You don't necessarily need a high voltage to
program the 10F322, but MCLR/VPP still needs to be controlled to get it
into the right mode.

All the gory details are here:
http://ww1.microchip.com/downloads/en/DeviceDoc/80529A.pdf

Regards,

Matt

Matt Bennett
Just outside of Austin, TX
30.51,-97.91

The views I express are my own, not that of my employer, a large
multinational corporation that you are familiar with.
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