Q$4.$Answer the following questions:

a$.$ Compute the time delay produced by the following subroutine.

WAIT: MOV R$0,$ #$100$

REPEAT: DJNZ RO$,$ REPEAT

RET

$-$b$.$ What line number will be executed after line number $0021?$

Page $2$ of

$0000||$

$001$E $|$ START:

$0020|$

$0021||$

$0024||$

$0025|$

$0027|$

$0029|$

ORG $0$

SJMP START

ORG $30$

MOV A$,3$

MOV R$0,$ A

CJNE A$,$ #$02,$ STAY

NOP

INC B

ADD $A,$#$0F1H$

SJMP STAY

END