The Design Of8051’s Interruption System With Verilog

8051microcontroller is applied widely in the domestic. Setting up comprehensiveVerilog model of8051microcontroller can be beneficial to the embedded system andvarious onchip debug system. In the degign of microcontroller, the design of the controlsignal is the most complex, and in control signal, the interruption system is the mostcomplex.8051microcontroller contains five interrupt sources: external interruption0,timer/counter0, external interruption1, timer/counter1, interruption of serial mouth.internal Two interrupt prioritys of8051microcontroller limit that the interruption controlsystem can only meet two priority nested interruption. As the function of8051microcontroller expands, the original interruption system cannot catch up with the actualapplication.This subject designs the interruption control system of8051microcontroller withVerilog HDL. It not only can meet interruption response control of different priority levels,but also can complete with priority level among the response control at the same time,realizing the seamless cohesion of different interruption responses. It also expands thepractical applicationof8051microcontroller. This subject optimizes the response process ofthe interruption of the control system to reduce the interrupt delay time, which means a lotto the real-time application and higher precision.The system also provides adjustment function of interrupt priority levels, so users candeal with interruption according to actual condition. This paper discussed the interruptcontrol circuit, interrupt response, nested interruption, completed the timer control module,external interruption, control module, a serial port control module with Verilog.Upon the completion of circuit analysis and design of sub-module, the whole circuitwas functional simulated and verified. Simulation is finished on ModelSim of Mentor.These measurements assured correct design of clock chip. The last design result completedaccord with the design specification.