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Improving Simulation Speed->Enable/Disable Serial Port
Use this option, by selecting it from the Options menu, to enable and disable the handling of the serial port.
By default the simulator will simulate the 8051 serial port. To do this, it calls a subroutine after the simulation of each normal instruction and this subroutine looks after the serial port.
It your program does not use the serial port, then you can disable this facility by toggling this option. The serial port handling subroutine is then by-passed and the simulation will proceed faster.
The setting of this option will apply only to the active 8051 program. It will be saved in the program status file for this 8051 program and restored when you next load this same program.