| 摘要 |
PURPOSE:To attain efficient data transfer between microcomputers by transferring the data again only when a data error is generated in a reception data and applying data transfer with priority when a reception side requests a data. CONSTITUTION:An error check means 2 of a receiver side microcomputer A checks a code error of the input data transferred from the outgoing side microcomputer B and when an error exists, the operation of the data processing means 3 is blocked. Then a retransmission request data from a retransmission request means 2c and an request ID data outputted from a request ID data generating means 4 are sent to the outgoing microcomputer B. A transmission data generating means 15 in the outgoing microcomputer B generates the data again corresponding to said request ID data and adds an error detection data and sends it to the receiver side microcomputer A again. When the receiver side processing means 3 requests a special data urgently, the corresponding ID data is sent from the ID data generating means 4. The outgoing side B receiving the ID data transfers the data corresponding to the ID to the receiver A with priority. |
