| 摘要 |
PURPOSE:To transmit a serial signal SS only for two consecutive frame transmis sion end signals FE are inputted through the reception of a timing signal and to reduce the cost by generating a 1-frame transmission end signal FE for each frame end of a serial signal SS-generated continuously. CONSTITUTION:A serial signal transmission section 11 sends a continuous serial signal SS and a 1-frame transmission end signal FE for each end of frame based on an output of an oscillator 10. Upon the receipt of a timing signal from a timing generating circuit 12, a control circuit 13 generates a control pulse for a period of 1-frame inputted by a succeeding FE from the point of time of the input of the signal FE from the transmission section 11 just after the input of the timing signal. A gate circuit 14 extracts the signal SS, for one frame period only for the received control pulse period and sends the extracted signal. Thus, even when the timing signal and the signal SS are a synchronous, the signal SS is extracted without use of a CPU, the cost of software is reduced and simple and small sized circuit constitution is attained. |
