thanks gurus,

peter , im calculating the discharging time of an inductor , timer is not countting same count every time ,+ - 2% or some time more error, im thinking for small code to fix this problem , for example , tl0 count is aah ,with + - 3% , how i can get upoer and lower limits , if the count are in between + - 3% then a port pin should low , i hope you will under stand my problem now

thanks

fk