jardine1687
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hi guys.i have a problem interfacing mt8870 to atmel ic at89c2051.. i have already made the circuit board of mt8870 basing on its datasheet circuit board and it works well..i can generate 4 (q1 to q4) logic outputs corresponding to the dtmf keypad which i press..but when this dtmf output logics is connected to my at89c2051 inputs p3.0,p3.1,p3.2,p3.3 the outputs of the dtmf mt8870 cannot generate anymore correct outputs...i dont know what the problem icheck the mt8870 and atmel board all is correct and no shorted at the board..here my schematic and assembly code..please give me some advice..tnx alot..:?
MOD: Re-Uploaded B/w Converted schematic.
MOD: Re-Uploaded B/w Converted schematic.