| 摘要 |
PURPOSE:To convert an applied data signal into a code with designation of one of plural conversion rulses, by using a signal line that converts a part of signals on an address bus into an input address signal of an ROM. CONSTITUTION:An ROM33 has plural conversion rules so as to convert input data into plural codes. One of these conversion rules is selected by an address signal 8 of a part of signals on an address bus 2. Then the ROM3 converts the data signal supplied through a data bus 1 into a code on the basis of the selected conversion rule and supplies the code to data receivers 51 and 52. Then a data receiver selected by decoding signals 71 and 72 supplied from a decoding circuit 6 receives a signal 4 converted into a code. |
