| 摘要 |
<p>DATA PROCESSING SYSTEM Disclosed is a data processing system for reading or writing data, in which the data to be read or the data to be written in a data memory unit is serially transferred bit by bit over a single line connected between the data memory unit and a processing unit in the system. The processing unit is operated in accordance with an instruction specified by the instruction addressing information which is produced by an instruction counter. The data is specified by the data addressing information which is produced by means for specifying the address of the data memory unit. Both the lower bits of the data addressing information and the lower bits of the instruction addressing information are jointly produced by the lower bit stages of the instruction counter. The upper bits of the data addressing information are momentarily stored in an upper bits specifying register during one read operation or during one write operation with regard to one execution of one data bit data is performed. Further, the data addressing information is provided synchronously with the provision of the instruction addressing information. Furthermore, the number of bits of the word of the data word must be equal to or must be a multiple of the number of bits of the word of the instruction word, or the number of bits of the word of the instruction word must be a multiple of the number of bits of the word of the data word.</p> |
