Ian Parish wrote:

> I need to expand the output capacity of the PIC to 16 bits.  My H/W
> design currently uses 2 14099 addressable latches. Any suggestions for
> a better way. I don't need a particularly fast response.

  I really *must* FAQ this!  The obvious way is with latched SIPO shift
registers; such as 74HC595 (Has clear on input registers, must strobe
latch clock to clear outputs), 4094B (has tri-state, no clear) or one of
a host of other devices which include output drivers.  74HC series of
course has modest drive capability, runs at 3 to 5V only (matches PIC)
whilst 4094 has negligible drive but can run at 15V.

  I/O requirements: data O (can be shared), clock (can be shared), latch
(unique).

  74HC597 (has buffer latch) and 74HC165 do the corresponding input
function.  Clock line can be shared, latch can be shared, data I cannot.
(Dispute the latter and pick a fight!)
--
  Cheers,
        Paul B.