how to delay a period of time ?

You can simply loop for some time and take care that each turn in the loops takes roughly 12/f (where f is the crystal frequency). Or if you need accurate timing you can use the timers together with he overflow flags

good luck

You can simply loop for some time and take care that each turn in the loops takes roughly 12/f (where f is the crystal frequency). Or if you need accurate timing you can use the timers together with he overflow flags

good luck