| 摘要 |
PURPOSE:To suppress the reduction of the processing speed and facilitate programming and debugging by immediately detecting the position of a two-dimensional image in accordance with the address value. CONSTITUTION:Lower nine bits from bit '0' to bit 8 of an address bus 5 are connected to an image memory 7, and bits from bit 9 to bit 15 are not connected to the image memory 7, and nine bits from bit 16 to bit 24 are connected to the image memory 7. Consequently, the position in the X-axis direction on two-dimensional coordinates is indicated by lower 16 bits of the address bus which is a multiple of 4 bits, and the position of the Y-axis direction is indicated by the other upper 16 bits, and lower four digits and upper four digits indicate the position in the X-axis direction and that in the Y-axis direction respectively when the address is expressed as a hexadecimal. Thus, the program is shortened, and consequently, the processing speed is increased and the debugging work is facilitated. |
