The Algorithmic Research on the Acquisition of Multiplex Pulse Period

In view of the need to examine the performance of seeding for corn precise seeder, a study has been carried on the interrupt examination with a timer to eight group pulse intervals the assembly language procedure algorithm and the hardware circuit, and realized in MCS-51 monolithic computer systems. This paper proposed the absolute-clock and the relative-clock´s thought; has found a special time-constant, has avoided in the data treating processes many bytes multiplication and division operation, has guaranteed the examination timeliness; has solved the time computation error problem when the multiplex pulses simultaneously arrived. We carried on the analysis to the examination timeliness and the examination data´s storage space demand, eight group examination´s most greatly realtime errors are smaller than 1 ms, saves eight group examination data (each group 500 gap data) to need 8 KB RAM space.