8051 and 7 segment in proteus problem

I make a digital clock with DS1307 and 7 segment and 74595 and simulate it in proteus 7.7. the led ok but the 7 segment not work POV in it i put there no delay in it, so the problem in simulation software (as 7 segment has response time i use .000001ms) or the fast display ( if i send data fast it must work cause or i wrong

Where can i found c code for digial clock using RTS and 7 segment display

Thanks