Write a c$18$ program to control the speed of DC motor by using a PWM with $Fpwm=20kHz$ and Fosc$=32MHz.$ The reference speed comes from five pushbuttons where. $[6$ points$]$

pushbuttonReference speed$(\%$ of rated speed$)$

$\backslash$table$[[$pb$0,0],[$pb$1,30\%$