hey!! i am trying to decode a DTMF tone by using a decoder chip then i send it to the microcontroller at89s52 and then display the output in the lcd but when the key on the telephone set is pressed 1 only one time, the no. 1 keeps on displaying...how do i solve it?? plz help!!
OK - so define some test or experiment to confirm that.
www.8052.com/.../120313
Then, when you're sure what the problem is, you can start to think about how to fix it...