I use the 8870 chip. It is an 18 pin DIP. Its input is DTMF from a phone or receiving radio. The output is a binary code ( four pins ). The only place I have seen this decoder is at BG micro.com out of Texas. I have used several of them and they always work perfect. I want to run the four output pins of the 8870 to four inputs on the PIC MCU 16F84a. The 8870 DTMF decoder holds the output constant until a new tone is entered in. In other words, if I touch the number 3 key on a touch tone phone, the output on the 8870 would be "0011" until I touched another key.

Furthermore, I am using an epic programmer from ME lab and the PicBasic compiler (if that helps). And let me remind you, I'm an idiot when it comes to programming these things. I'm just getting started. Thanks for the reply. Any help would be appreciated.

Darren