how to start timer in 89C51 by programing(source code) nd stop by external hardware

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Zohaibmaroof

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i want to start a timer in 89c51 after a 10 usec pulse is given by pin p1.1 then timer wil continue to count the time and stop when it gets low on pin p1.2 , basicaly pin p1.2 is initialy LOW i want to stop the timer when it goes from low to HIGH and then again low after that i want to stop the timer and also i want to use that TIMER value for further process

plz can any buddy help me out for the source code of that

thanks in advance
 

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