| 摘要 |
<p>PURPOSE:To attain the efficiency of the storing area of a second storing part by holding the partial bit part of plural data in a first storing part, merging a residual bit part to the second storing part and extracting the contents of the second storing part. CONSTITUTION:For instance, the data D0-D7 of the low order 8 bits of 10 bit data is stored in the 8 bit ROM 11 of the first storing part. The residual two bit data is merged to the 8 bit ROM 12 of the second storing part. At the time of reading the data D1 at the addresses A0-A2 of 3 bits, for instance, at 001 from the ROM 11, the two bit data corresponding to the data D1 extracted by a selector 13 controlled by the address A1A0=01 of the residual two bit data read from the ROM 12 according to the address A2=0 is outputted and the 10 bit data is read by the use of the 8 bit ROM. According to this constitution, a free area is eliminated to attain the efficiency of the storing area of the second storing part.</p> |
