| 摘要 |
A shaper of periodic sequence of three pulse code groups with programmable time parameters, multiple of a period of a repetition pulse train supplied to input thereof from an output of external crystal-controlled oscillator comprises a reversible binary countdown counter having synchronous parallel load inputs, a counting mode enable input and an asynchronous reset, an overflow output of which is connected to an enable input for synchronous parallel setting in a state determined by variables which are supplied to parallel load inputs that provides programmability of counter state numbers and therefore, a pulse repetition period at overflow output. A binary adder, four inverters, a comparator, a synchronous D-flip-flop with asynchronous reset, a three-input OR-NOT element, a two-input AND-NOT element and a circuit comprising a resistor and a capacitor are introduced. |
