What is software SPI speed for various OSC speeds?

[CuriousOne]

Thanks, I was thinking about that, but just with external transistor, which will drive common pin for 7 segment....

[richard]

So if I up clock to 8mhz, I can do 50khz, with some overhead for counter code and so on.

1k if you're lucky imo

[CuriousOne]

Tried some lower speeds with MAX7219 and scan rate definitely causes issues - the moment digits are just going off being registered by high speed camera, so it is hard to guess what is displayed right now. Already noticeable at 5000fps.