Hi Guys
I have two cascaded latching shift registers (74595) with their reset, latch,
and clock inputs tied together, and the carry for the first shift register
connected to the data pin of the second. So basically a single 16 bit shift register.
I only need 8 bits, and the second chip is for a trick to save microcontroller IO pins.
Say I connect the second bit of the second chip to both of the chip’s latch pins,
and always send a leading set bit, followed by a zero, and then the byte that has to be latched.
I should be able to save the IO pin normally used for latching right?
Well only if I reset afterward so the 8 data bits don’t also latch when they are shifted out.
The next part: Say the third or fourth bit of the second chip is connected to both reset pins.
Then I should also have it auto reset by the same bit earlier used to latch,
so that I can regularly shift out and latch 8 bits with only 2 IO pins.
Of course, the real answer is “try it on a breadbord”, but does anyone conceive any issue with this?
Cheers