Modify the program to only display $4$ LSB values of the $16-$bit counter on $4$ LSB of

PORTC $($i$.$e$.$ RC$3-$RC$0).$ Note that the other bits of PORTC should not change at all.

Use PORTC $=0$x$3$FF $($i$.$e$.$ all $1)$ in the SETUP as the initial value

Hint: You can do this by reading PORTC, changing the required bits, and writing it

back as explained in the following steps:

$$ Reed PORTC and clear $4$ LSB values using & $($AND$).$ This masking.

$$ Mask all unwanted bits of the counter to keep only $4$ LSB values $($using &$)$

$$ Add two values together and send it to PORTC. You can also use $|($OR$)$

instead of adding.

Verify that the program works as expected.