| 摘要 |
<p>PURPOSE:To improve a processing efficiency by making a series of an input converting process from a pulse width to an input level as a hardware. CONSTITUTION:When an input detecting circuit 2 detects the changed edge of an input terminal 1, a one pulse signal 3 is supplied in a latch circuit 7 and a comparing circuit 9. A timer counter 5 counts a frequency dividing clock 4, and the latch circuit 7 latches the value of the timer counter 5 through a bus 6 at the rise of the pulse signal 3. The comparing circuit 9 compares the value of the latch circuit 7 obtained through a bus 8 at the fall of the pulse signal 3 with the value of a reference value 11 obtained through a bus 10, and the result of a size comparison is supplied in an arithmetic circuit 15 through a signal line 12. Then the arithmetic circuit 15 executes an arithmetic to the value of the latch circuit 7 obtained through a bus 14 based on the compared result of the comparing circuit 9 obtained through the signal 12 at the signal of the finish of a discrimination from the comparing circuit 9 through a signal 13, then updates the reference value 11 through a bus 16. Thus, a continuous scanning becomes possible.</p> |
