Question: Write a program to divide a $32$ bit number by $16$ bit number

We follow repetitive subtraction method to divide two numbers.

AREA RESET, DATA, READONLY

$13|$ P a g e

ESLAB MANUAL

LAB $4$: Code Conversion Programs

EXPORT $\_$ Vectors

Vectors

DCD $040001000$; stack pointer value when stack is empty

DCD Reset$\_$Handler ; reset vector

ALIGN

AREA mycode, CODE, READONLY

ENTRY

EXPORT Reset$\_$Handler

Reset$\_$Handler

MOV R$2,$#$00$

LDR RO$,=$VALUE$1,$; pointer to the first value $1$

LDR R$1,[$R$0]$ ; load the first value into $r1$

LDR RO$,=$VALUE$2$ ; pointer to the second value

LDR R$3,[$R$0]$ ;load second number into r$3$

up SUB R$1,$ R$3$ ;Subtract two numbers

ADD R$2,$#$01$ ;increment a counter

CMP R$1,$R$3$ ; compare two numbers

BCS up ;check R$1$is greater than R$3$ or not, if yes loop

LDR R$6,=$RESULT ;Quotient

STR R$2,[$R$6,$#$4]$

STR R$1,[$R$6]$ ;Store remainder.

STOP

B STOP

VALUE$1$ DCD $0\backslash$times $200000000$; ;First $32$ bit number

VALUE$2$ DCD $000050000$;Second $16$ bit number