Question

: Write and assemble a program to add all the single digits of your ID number and save the result in WREG. Pick 7 random numbers (all single digit) if you do not want to use your ID number. Then use the MPLAB simulator to single-step the program and examine the registers.

Answer 1

answer:

The assembly program to add all the single digits of given number and to save the result in WREG is,

INCLUDE io.h //it includes the header file

cr EQU 0ah

lf EQU 0dh

data SEGMENT

num DB cr,lf ,'enter a number:', 0

sum_1 DB cr,lf ,'the sum is:', 0

ten DW?

temp DW 40 DUP (?)

data ENDS

code SEGMENT
ASSUME cs:code , ds:data

start:

mov ax , data

mov ds , ax // input the number

output num

inputs temp , 10

atoi temp // initialize

mov cx , 00h // stores the sum of digits

mov ten, 10 // iteration

cmp ax,0 //exit loop if the number =0

jz sum_1

cwd

idiv ten

addwf cx, ds // add the unit digits and result is stored in wreg since the result is 8 bit

jmp next

sum_1 :output sum_1 // we can also output the result if we want to do so

itoa temp,cx

output temp

quit : mov al , 00h

mov ah, 4ch

int 21h

code ENDS

END start // end of program

the above given program is a assembly language preogram to add all the digits in a number and store the result into the wreg.and i have also output the sum of digits

Execution :

during execution enter the number - 5002466113

the output will both be displayed and stored

a.) program to pick a random number

Randmno: Ds1

randm:mov a , rendmno

jnz randmno

cpl a

mov randmno , a

randmno : anl a, #10100100b

mov , c, p

mov a , randmno

rlc a

mov randmno , a

ret

simulation:

use simulator to single step the program and examine the file register values

by this method you can look the value of file registers at a specific step of the program

ile Edit Tools Settings Simulation Subroutine View Load Sample Program Help EditorAssembler Registers Memory Devices 8085 Assembly Language Editor Registers Assembler Disassembler Register Value 7 65 4 3 2 10 ccumulator egister B egister C egister D egister E egister H egister L LICLUDE 10.h at: SIGMENT emory(M) Resister Value SZACPCY ten DW lag Resister Value tack Pointer(SP) emory Pointer (HL) rogram Status Word (PS W) rogram Counter(PC) lock Cycle Counter nstruction Counter 0 0 0 input the number SOD SID INTR TRAP R7.5 R6.5 R5.5 output p run atoi tmpstr For SIM instruction SOD SDE R7.5 MSE M... M... M 0 For RIM instruction SID 17.5 16.5 15,5 IE M... M... M. Autocorrect Assemble 0 No. Converter Tool Hexadecimal Decimal Binary

in mplab simulator , you follow tools > options >select embedded>select generic settings>debug startup>halt at main> click ok

you can see a green highted text in program . that is the place where the program stopped execution there you can click "step into" icon

now add " lata from sfs " to watchlist to view file registers

Answer 2

INCLUDE io.h //it includes the header file

cr EQU 0ah

lf EQU 0dh

data SEGMENT

num DB cr,lf ,'enter a number:', 0

sum_1 DB cr,lf ,'the sum is:', 0

ten DW?

temp DW 40 DUP (?)

data ENDS

code SEGMENT
ASSUME cs:code , ds:data

start:

mov ax , data

mov ds , ax // input the number

output num

inputs temp , 10

atoi temp // initialize

mov cx , 00h // stores the sum of digits

mov ten, 10 // iteration

cmp ax,0 //exit loop if the number =0

jz sum_1

cwd

idiv ten

addwf cx, ds // add the unit digits and result is stored in wreg since the result is 8 bit

jmp next

sum_1 :output sum_1 // we can also output the result if we want to do so

itoa temp,cx

output temp

quit : mov al , 00h

mov ah, 4ch

int 21h

code ENDS

END start // end of program

the above given program is a assembly language preogram to add all the digits in a number and store the result into the wreg.and i have also output the sum of digits

Execution :

during execution enter the number - 5002466113

the output will both be displayed and stored

a.) program to pick a random number

Randmno: Ds1

randm:mov a , rendmno

jnz randmno

cpl a

mov randmno , a

randmno : anl a, #10100100b

mov , c, p

mov a , randmno

rlc a

mov randmno , a

ret

simulation: