| 摘要 |
PURPOSE:To produce the reference signal for time, by keeping equal the number of instruction cycles for each processing routine in the program of microprocessor each other and counting the cycle time of program. CONSTITUTION:In the microprocessor 2, when the program goes from the start point A to the end point B, it is branched into three routines with the presence of the judgement and instruction sections 1B and 2B. By keeping equal those three routines and the number of instruction cycles, the program processing cycle time is kept constant. In the internal of the non-judgement instruction section 1A, count up is made by one through one time passage of the routine and reset is made when this counter reaches N to form the reference signal of one second. Thus, crystal oscillator is used for the reference frequency oscillator 1 to control the output unit having the time element such as digital type or analog type clock 3. |
