| 摘要 |
PURPOSE:To make a circuit integrates easy and to attain small size, by constituting the system mainly with digital circuits. CONSTITUTION:In operating the circuit as the 1st dial pulse wave shaping circuit using the 1st pickup means DET1, selection circuits SEL1 and SEL2 are selected to an input terminal A with an operation mode instruction signal input SEL to input outputs O and L of the DET1 to the inputs U and D of an up-down counter CTR, and the operation mode of the CTR is switched to a dial pulse wave shape circuit. In operating the circuit as the 2nd response detection circuit using the 2nd pickup means DET2, an operation mode instruction signal input SEL selects the SEL1 and SEL2 to an input terminal B to input outputs CMP1 and CMP2 of the 2nd pickup means DET2 to the inputs U and D of the CTR, and the operation mode of the CTR is switched to the protective operation for the detection of response. |
