| 摘要 |
<p>PURPOSE:To output accurate and stable coordinates by outputting effective up- to-date data by comparing the last data with the up-to-date data whereas two deviations of each data obtained by sampling at every coordinate are within a permissible range. CONSTITUTION:Sampling by AD conversion is performed >=2 times successively after switching to an X-coordinate detection mode, and when the difference between its maximum and minimum is within a range shown by slanting lines 36, it is decided that the contacting between a pen and a resistor sheet is stable. When the difference exceeds the range, a transient response monitoring and data collecting circuit 18 sets its transient flag 23. Similarly, detection as to Y coordinates is performed. When the flag 23 is set, the control is transferred to the rejection control circuit 31 of a sequence control circuit 19 to judges whether the cause is temporary or not, controlling the whole sequence. When the flag 23 is not set after the completion of a series of operations, it is guaranteed that data in Xphi and Yphi registers 11 and 12 are nearly accurate.</p> |
