Josef Hanzal wrote:
>
> >Now here's the question: Can I safely program PIC in
> >app, when it's clk and data are tied to the clk and
> >data of shift register?
> >
> >     RB5 ------------------------------------- E
> >
> >     RB7 ------o----------- data        ------ RW
> >PIC            |                  4015  ------ RS   LCD
> >     RB6 ------+-----o----- clock       ------ D0
> >               |     |                  ------ D1
> >    ~MCLR------+-----+-----+                   ...
> >               |     |     |
> >               |     |     |
> >             data  clock ~mclr
> >             programming
> >
> >(I'd say yes, sr isn't driving PIC's pins anywhere, and
> >LCD doesn't do anything 'cause there will be no Enable)
> >
> >
>
> Yes, I would only recommend 74HC164 instead of 4016 and using the display in
> 4 bit mode. In this way you can control the display using only 3 port pins.

Why not use an I2C LCD? Then you only need two lines.

--
Friendly Regards

Tjaart van der Walt
mailto:tjaart@wasp.co.za
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