>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.

Josef Hanzal
euroclass@pha.pvtnet.cz