Graynomad:
as the pins need to be kept HIGH for the relevant cycle and then set LOW again
Which pins?
The only one that matters is the clock and it's edge triggered, so whether you give it a short high pulse or a short low pulse as far as the eye is concerned the SR will update the same way.
Oh Ok cool. I did kind of wonder while I was typing whether it did need to be held or not. Yes sorry, I meant just the clock pin. I don't really know what edge triggered means ...
... Googling ...
... oh Ok, so it only needs a pulse, it's the change in state that triggers (magical stuff inside the IC) rather than whether it's in any particular state?
How would I have known that if you hadn't told me? Presumably that sort of information is included in an ICs datasheet?
Thanks again
Jim