Thanks for the advice. I checked the Mod 6 and looking closely, there is no 
flicker whatsoever. Hopefully I can get to 4ms updates or close, by writing 
directly to the port, bypassing digitalWrite(), and optimizing the code. 
Assembly language is not an option. Last time I did that was in college, on 
a General Automation minicomputer.

The CD4504 has two unused level shifters so I will connect each of the 
three HV5530's data lines directly to the processor, clocking three bits at 
the same time, without adding hardware. Data for each digit is stored 
separately, so the software changes are easy, at least for that part. 

Hopefully fading will get done, after all.

 

>  There is a possible advantage to just using separate data lines, while 
> keeping the CLK/LE/BLANK lines paralleled. You could clock out the data in 
> 1/3 the time.  
>  
>
>  

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