Hello to all Piclisters,

I am designing a circuit which uses 3 shift-registers to spare some
microcontroller inputs. I actually use 74HC165 as a shift register, but
I found also CD4021. In practice, I found out that the data pin of each
register cannot be tied to a common data bus. Is there a solution to do
this ? (for 3 shift-registers, tie the Q7 data out pin to the same data
bus D0 pin, which is also common to other circuits).
Is it worth to have an address/data/command bus for a PIC project, which
uses one latch, 3 shift-registers, one analog multiplexer and an ADC ?
Thank you for your answers.

Lucian Copat

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