| 摘要 |
PROBLEM TO BE SOLVED: To perform the scanning of a desired range several times by only an advance scan of one time by respectively storing a scanning starting position and a scanning stopping position in an edge signal storage part and a reverse edge signal storage part in the advance scan. SOLUTION: At first, the inverse of CNT signal is made to be an H and a start pulse ΦST is made to be an L and a shift register is made to perform shifts according to clocks Φ1 , Φ2 . At this time, the output of the edge detecting part 3 of a unit block 2 becomes the H when the shift pulse falls and becomes the L in other periods and the output of a reverse edge detecting part 4 becomes the L when the shift pulse rises and becomes the H in other periods. Next, when a memory signal ΦM is made to be the H, outputs of the detecting parts 3, 4 are respectively stored in an edge signal storage part 7 and a reverse edge signal storage part 8. Next, when the inverse of CNT signal is made to be the L, a transfer control part 12 becomes in an ON state, the output of a shift register unit 1A is reset to the H. Continuously, a transfer signal ΦT is made to be the H, outputs of the storage part 7b and a preset level oscillator 9 of each block 2 are transferred to each unit 1A in a period when the clock Φ1 becomes the H. |
