PICTURE DATA WRITE CONTROLLER

摘要

PURPOSE:To complete once the write of a picture data by comparing an address of a section designating write inhibition with a full area scanning address scanning all areas so as to control the write of a picture data. CONSTITUTION:A start address (XS, YS) and an end address (XE, YE) of a write inhibition section of a picture data are set in a mask register 1. A compare circuit 2 compares the designation address with a full area scanning address and gives a write suppression signal to a gate 4 via an inverter 3 while the full area scanning address exists in the write inhibition designation section. Thus, the write of the picture data is inhibited in a picture storage means as to the designation section and the information at the outside of the designated section is changed simply.