| 摘要 |
PURPOSE:To provide two functions to one circuit by bringing J, K terminals of a JK flip-flop to all high level to act it as a flip-flop and bringing the levels of the J, K terminals opposedly to each other to cause D-FF operation thereby forming a shift counter. CONSTITUTION:When a load signal LD reaches an L level, the input to data terminals A to D causes a hexadecimal number 'A' at terminals QA to QD. With the load signal LD at an H level, a count enable signal CE at an H level and a switching signal C/S at an L level, then the count is started at the leading of a clock signal CLOCK. When the switching signal C/S reaches an H level, data of a serial input signal SI is loaded (H level) to the terminal QA at the leading of the clock signal at a location (d) and the shift is started at the leading of the clock signal. |
