An AT$89$C$52$ microcontroller oscillator is working with a $12$ MHz crystal. There is an LED connected to pin $8$ of the P$1$ port. Write the codes that turn this LED on and off for the following periods. a$.$ 'delay$1\text{'}$ b$.$ 'delay$2\text{'}$ c$.$ 'delay$3\text{'}3.$ An AT$89$C$52$ microcontroller oscillator operates with a $4$ MHz crystal. There is an LED connected to pin $8$ of the P$1$ port. Write the codes that turn this LED on and off for the following periods. a$.$ 'delay$1\text{'}$ b$.$ 'delay$2\text{'}$ c$.$ 'delay$3\text{'}4.$ Repeat question $3$ for $11\mathrm{.}0592$ MHz