$4\mathrm{.}3\mathrm{.}1$ Specifications

Write and test a C program that produces a PWM signal with a variable frequency and variable duty cycle. The program should establish a serial connection $($baud rate of $1200bps,8$ data bit, $1$ stop bit, no parity, flow control OFF$),$ and let the user enter the frequency in $Hz$ and the duty cycle in percentage, using the HyperTerminal program.

Please write programme in C that uses an atmega$16$ microcontroller to do this.