| 摘要 |
<p>PROBLEM TO BE SOLVED: To execute a second job during an interval when a first job is not processed by an arrangement wherein a second time measuring means generates an instruction for executing the processing in synchronism with the instruction generating period of a first time measuring means. SOLUTION: A timer 23 repeats timer process regardless of presence of a job and Tw processing is performed every time when the timer 23 expires. Since a vertical synchronizing signal is requested nor outputted even if Tw interruption is started when a job is not executed, a latch pulse is outputted immediately to interrupt provision of a horizontal synchronizing signal and the Tw interruption processing is ended. When the vertical synchronizing signal is requested to be outputted, the timer 23 initializes the vertical synchronizing signal immediately based on the time up. A CPU 20 sets a line counter at '0' to start a job. When the job is continued and the line counter reaches a predetermined count, the vertical and horizontal synchronizing signals are concluded and the processing is ended.</p> |
