Hi

My DAA for the telephone line is complete. i been using the 8880 to generate DTMF tunes.

But now i am considering to eliminate this chip and use the microcontroller pin to generate DTMF. So


- i need any code in assembly or C++ which can generate all telephone DTMF tunes from the 8052 pin.


- Also give me any suggestion how to adjust issues like voltages for the tunes generated from 8052.



Any help will be highly appriciated.

Shahzad