5 replies to this topic

[Mario Vernari]

I found this page showing how the famous 74HC595 shift-register works. It allows to interact with the user. Much easier to see than to explain! http://conductiveres...ster-simulator/ Have fun.

[supra]

Thank, man!

[Paul Newton]

Good resource to have a play with, but be careful as it is not quite correct.

[Mario Vernari]

Good resource to have a play with, but be careful as it is not quite correct.

Where's the problem? Should we forward it to the owners?

[Paul Newton]

Looking at the feedback on the site, back in 2011 the author fixed two issues with the shift register clear and output. What I had an issue with is that the output enable does nothing to the outputs - not very important, but may be confusing to someone who is not sure how it should work. Also I had a few problems getting it to respond to presses. This meant for me that some of the clock pulses were ignored and it is hard to put in a test sequence accurately. This is probably because I am using it with chrome on Android, I expect it is a whole lot better on a PC with a mouse! In summary - don't be put off trying it, it is a useful gadget to understand how the 74595 works. But, there are some minor issues. Paul

[Mario Vernari]

You are right about the inaccuracy of the simulator. When the /OE is high, the outputs should be marked as "Z". There's no a clear timing sequence of the signals, so that when wiring the '595 to the SPI you have hard time by understanding the edges, etc. Anyway, it's just a nice toy for who's taking a little practice with this chip. Cheers