Modify the solution of question 1 to have a down/up counter as follows:

· RA2= 0 Counter is disabled.

· RA2= 1 Counter is enabled:

o If there is negative edge signal at pin RA3 then counter counts up.

o If there is negative edge signal at pin RA4 then counter counts up.-Modify the solution of question 1 to have a down/up counter as follows:

· RA2= 0　Counter is disabled.

· RA2= 1　Counter is enabled:

o If there is negative edge signal at pin RA3 then counter counts up.

o If there is negative edge signal at pin RA4 then counter counts up.