Write a main program to enable external interrupt $0$ and external interrupt $1$ to receive level triggered interruptrequest and keep waiting for the interrupt. When $8051$ is interrupted through INT$0,$ write an ISR to obtain asquare wave of $4$ KHz at P$1\mathrm{.}6$ pin of $8051$ continuously. When $8051$ is interrupted through INT$1,$ write an ISRto obtain a square wave of $8$ KHz at P$1\mathrm{.}6$ pin of $8051$ continuously. Use timers of $8051$ to obtain the requireddelay. Illustrate the interrupt priority to execute lower and higher$-$level interrupts