$($a$)$ Describe:

i$)$ Interrupt maskability

ii$)$ Interrupt priority

$[2$ Mark$]$

$[1$ Mark$]$

$($b$)$ Write an instruction sequence to setup INT$2$ for an application triggered by a rising

edge signal and make the INT$2$ as a low priority interrupt.

$[3$ Marks$]$

$($c$)$ Write an assembly program to implement a digital counter using Timerl external clock

source connected a push button $($SW$).$ For every EIGHT $(8)$ presses of the push button

SW$,$ the PIC$18$F$6585$ increments the count by one, up to a maximum count of D$\text{'}65535\text{'}$

and save the count in data memory at addresses $010$ and $011$ based on little endian

format. Configure the SW as an external clock source to Timerl with low priority

interrupt. Configure Timerl to perform read$/$write the register in one $16-$bit operation

and do not synchronize the external clock input.help