| 摘要 |
<p>PURPOSE:To repeat data transferring action unaided by providing a data transfer circuit through which data within a rectangular domain specified to a memory are transferred to a specified place, a timer to issue a signal showing the end of the data transfer action with specified time-lag, and a start control circuit which obtains the output given by the timer to restart the transferring action. CONSTITUTION:A data transfer circuit(Bit-BLT) transfers data within a specified rectangular domain on a bit map memory(BMM) 2 to another place on the same memory 2. When an outside start signal 6 is inputted into a start control circuit 5 through an OR-gate 9, the circuit 5 is triggered for starting transfer action to start the transfer of the data within the rectangular domain. When the data transfer finishes, an end signal is issued from the circuit 5 to a signal line 7, and inputted into a timer 8, and further into the circuit 5 through the gate 9 with preset time lag. Thus the circuit 5 is triggered again for executing the data transfer again, and after that, the transfer is repeated without the assistance of an outside device.</p> |
