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Simulator Commands->Trigger Interrupt 1
Use this command to set the interrupt 1 edge flag EI1. An external interrupt will then be triggered prior to the simulation of the next instruction.
This command will be ignored unless your 8051 program has enabled external interrupt 1 by setting the EX1 and EA bits.
Be aware that the undo instruction and undo command commands assume that the execution path will be identical when it is repeated. This is unlikely to be the case if you have manually triggered an external interrupt and so the performance of these undo commands will be somewhat unpredictable.