Q$7.(20$ pts$.)$ a$.$ For the following assembly code, determine the registers that are affected at each instruction cycle, and show how their contents change by filling in the following table. Assume that all. pins of PORTB are configured as output. $($Destination select; $d=0$ : store result h$.$W$,d=1$ store result in file register $f.$

movf PORTB,W

andlw $0xF8$

iorwf ctr$,0$

movwf PORTB

clf sum

btfsc ctr$,0$

$\backslash$table$[[\backslash$table$[[$Time$],[($Instruction$],[$Cycle$)]],$W$-$reg,PORTB,ctr$,$sum$],[0,000,0F0,005,003$