Design a cycle, adjustable duty ratio of pulse generator, pulse produced in the process, for pulse cycle, high level and low level to adjust the duration; Adjust step since; And at the same time show pulse frequency, duty cycle and is output by the number of pulse, if the pulse number has reached the limit value of digital tube display, the result will reset to count,
System provides 50 MHZ clock source, to complete the design of hardware and software of the system, and experimental verification, the final design itself to submit a course design specifications,