how to glow 3 led's at a time having diffrent sets of delay?

[regin]

hi frds,

as a beginner in embbedded c coding ,i am faceing a problem


my aim is to glow three led ,each having 3 sets of delay.(30 sec,1min,1.30min respectivily).



how to use interrupts in c code. (any links or pdf )

 

[Easyrider83]

what controller and compiler do you using?

 

[regin]

i am using AT89c51 controller and keil complier.