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Improving Simulation Speed->Enable/Disable Timers
Use this option, by selecting it from the Options menu, to enable and disable the handling of the timers.
By default the simulator will simulate the 8051 timers. To do this, it calls a subroutine after the simulation of each normal instruction and this subroutine looks after the timers.
If your program does not use the timers, then you can disable this facility by toggling this option. The timer handling subroutine is then bypassed 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.