| 摘要 |
A character data processor for a videotex or teletext system includes a microcomputer section, a self data processing unit and a read/write memory. A memory access period for the memory exists in one read/write cycle of character data packets. Data processing unit responds to a first pulse indicating the start of the memory access period and to a second pulse indicating the end of the memory access period. Data processing unit includes an address change circuit which stores initial address data and transfers address data stored therein to the memory according to a transfer pulse. The content of address data is changed by a change pulse. A data register relays data transferred between the microcomputer section and the memory. A generator circuit generates the transfer pulse, the change pulse and a clock pulse according to the generation of the first and second pulses and a detection signal. A detection circuit responds to prescribed data indicating the run length of character data. A detection circuit detects a number of times of data transfer between the microcomputer section and the memory according to the clock pulse, and generates the detection signal when the number of times of data transferring corresponds to the prescribed data.
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