3. Assume that an external clock signal is being fed into pin TOCKI (RCO). Write a program to use Timer3 in 16-bit mode to count the pulses and display the TMR3H and TMR3L registers on PORTB and PORTD, respectively (be sure to read the low register of the timer first). Start the count at OH. Use the MPLAB simulator to verify the proper operation of the program. You may need to use the Watch window to view the contents of TMR3H and TRM3L as it may not be obvious using the Logic Analyzer, that the contents of TRM3H are incrementing PIC18 PB and PD RCO T1CKI