[email protected] said:
If you use 16- or 24-bit serial-parallel-latches or "port expanders" then
you only need 2 or 3 pins of the microcontroller. Use one or more '595 or
look at the wonderful chips by Unitrode/Allegro.
There is still the problem of updating all of the expander chips at the same
time.
Hal,
The expanders I've seen have serial-in and serial-out. So the
trick is you daisy chain the serial lines of the chips but drive
the latches in parallel. That way you can quietly shift in all N
bits and then latch one and all.
/tvb
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