QUESTION $2[20$ MARKS$]$

$($a$)$ Given $[020]=07A,[021]=005$ and $C=1,$ show the status of $N,OV$ and $DC$ after the following instruction:

$[3$ Marks$]$

MOVF $020,$ W$,$ A

ADDWFC $021,F,A$

$($b$)$ Without using multiplication instruction, multiply the content of $043$ with $2.$

$[3$ Marks$]$

$($c$)$ Write an instruction sequence to read one byte data at program memory location $02480$ and write to file register at $0250.$

$[6$ Marks$]$

$($d$)$ Figure $2$ depicts a macro program and an incomplete delay subroutine. There are missing instructions from Line $3$ until Line $7.$ The time delay provided by delay subroutine is $20ms.$ Calculate total instruction cycles and complete the missing lines by writing a complete subroutine named delay. Assume the crystal frequency is $32MHz.$ Show ALL your calculations.

$[8$ Marks$]$Figure $2$: Program for Question $2($d$)$help