On 04/12/16 16:21, Tim Watts wrote:
On 04/12/16 10:19, Andy Burns wrote:
Tim Watts wrote:

Load up 24xNumLEDs bytes into RAM and let it rip. Do
whatever at the end to cause the registers to be latched to the LED
drive outputs.

They latch one-by-one not all at once, e.g starting from an idle state

With respect, are you *certain* of that? I was reading the spec sheet of
the one in the Unicorn Hat and I seem to recall a clever almost
synchronous signal that was used to latch the register to the outout
driver.

But that could be a fabrication of my imagination - I'll have to go bac
to the sheet...


Just read the data sheet again - lack of a schematic doesn't help, but I
think I'm wrong - there does not seem to be an extra latch.