Write a C statement to configure the lowest $4$ pins of PORT A as outputs and the highest $4$ pins

as inputs. Write the instruction using binary notation.

$2)$ Write a C statement to configure all the pins of PORT C as outputs. Write the instruction using

hexadecimal notation.

$3)$ Write a C statement to configure all the pins of PORT D as inputs. Write the instruction using

decimal notation.

$4)$ Write a C statement to output $5$ volts through pin PB$6$ and zero volts through the remaining pins

of PORT B$.$ Write the instruction using binary notation, then do it using hexadecimal, and

decimal notation.

$5)$ What is a pull up resistor and why do we need them in mechatronics?

$6)$ Draw a typical circuit involving a pull up resistor? What is a typical value for a pull up resistor?

$7)$ Write the necessary instructions to configure PORT A as an input port and then set via software

pull up resistors in all pins.

$8)$ You want to check if the third bit of the register PINC is HIGH regardless of the value of the other

bits. You must use binary notation.

$9)$ Set to zero the eight bit of register PORTA without changing the status of the other bits. You must

use binary notation.

$10)$ Set to one the first bit of register PORTB without changing the status of the other bits. You must