| 摘要 |
PURPOSE:To eliminate the need for the software and also to manage that only one trasmission will do for a sample serial data by generating plural kinds of Baud rate clocks through the combination of a D/A converter and an operational amplifier. CONSTITUTION:A serial date with a Baud rate transmitted from a terminal devide is inputted to a reception terminal of a serial I/O and also to an AND gate 1 of a Baud rate automatic generating system. An output of a pulse generator 2 is inputted to the AND gate 1 and also to an N-bit counter 3. The output of the counter 3 is inputted to a D/A converter 6. In setting the output voltage of the D/A converter 6 corresponding to the Baud rate of the inputted serial data, a sinusoidal wave having a frequency corresponding to the output voltage is obtained from an oscillating circuit comprising an operational amplifier. The wave is converted into a rectangular wave by a Schmitt trigger circuit 8, frequency- divided by 1/120 at a frequency division circuit 9 so as to obtain the sampling frequency having the desired Baud rate. |
