The Design And Development Of S08 Family's MCU Software Simulator

The 8-bit MCUs of Freescale Semiconductor had been widely usded,And enhanced performation 8-bit MCU-HCS08 family(named as S08 family in the following part) was born in about 2004,and by now,the new family has had 217 member products. The software simulation can provide a virtual platform for the beginners with an easy way to learn without the actual hardware environmental absolutely. There is so little simulator for this new kind of S08 family,which gives it big sense in the design of software simulation for them.It adopts the idea of object-orientation and classifies the simulation by the aspect of system resource object into CPU simulation,inner module,peripheric module and memory and peripheral device simulation.Also it imports Bulider design mode to construct CPU and MCU object,and it provides for users with the user-interface(UI) and debugger.The simulation of universal instruction sets is not easy to achieve,but the vitual instruction sets makes it come true.The simulation of IO registers in memory is another devil,a powerful way to manage it is the combination of memory resource and module function reflect.By using CPU clock as the couter mechanism,it makes all the resources work under the union timing system.And it also provides the solution for other problems,such as the cooperation and communication between the processes to realize the bit-to-bit transmittion in SCI module simulation,the stflash structer in Flash sector to simplify the instruction's analysis and running progress,and the combination with peripheric module and virtual peripheric devices and UI,which combines the structural and instructional simulation together and makes it be used as simply as abc.and so on.