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multiplexing 7 segment displays using at89c52(11.0592 crystal)

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hey...im multiplexing 6 7-segment displays....
im having a problem in a delay time...could u plz me help me,
plz tell me the human-eye deceiving time...i mean ,the time in which human eye cannot differentiate between two events.i need dat critical time,
if any-one has source code in C.i would b greatful.:oops:
 

what is the problem with delay?
 

He wants to know what frame rate (frequency) to use so that the leds look like they are constantly on, and the switching on/off is not visible.
I would say about 50 times a second minimum for each led but 100 would be better, for 6 of them minimum 6x50=300 HZ so that each one lights 50 times a second.
Assuming you have a refresh routine that lights one led in each call you need to call it in a frequency of 300Hz, every 1/300=3.3ms

Alex

---------- Post added at 02:01 ---------- Previous post was at 01:38 ----------

Also check my post https://www.edaboard.com/threads/194984/#post817010

Alex
 

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