| 摘要 |
PURPOSE:To attain supervision of a depiction area in a real time at calculation of a depiction point coordinate by providing a means storing a prescribed area data with respect to depiction and a means comparing the result of revision operation of a coordinate with a prescribed are data and detecting whether or not the result is within a prescribed range. CONSTITUTION:An operating device 14 revises an X or a Y coordinate stored in an X register 131 or a Y register 132 of a depiction point coordinate register 13 from a temporary storage register 12 under the control of a controller 11. The result of operation is inputted to a comparator 16 comprising window comparators or the like, compared with a content stored in the depiction area management registor. That is, the result (x) of operation of the revised X coordinate of the operating device 14 and a minimum value X MIN and maximum value XMAX of the selected X coordinate from the depiction area management register 15 are compared and discriminated according to Equation of XMIN<=X<=XMAX. The result of comparison is entried in the X flag 181 selected from a temporary storage flag 18, where the result is reflected. |
