It is frequent enough.

Slowest rate > 7 X 50 = 350/sec.

Zemin Liu


>Greetings,
>        I am building a moving message display. It is 7 rows x 80 columns.
>Multiplexing will be accomplished by loading shift registers with column
>data and the powering sequential rows for 1.64mS each. Therefore, each row
>will be refreshed once every 11.5mS.
>        Is the refresh rate frequent enough to eliminate flicker? Can I
>refresh at a slower rate? I sure could use the extra time for other tasks,
>but I don't want a flickery display!!
>
>Thanks!                      Jeff
>
>