68H12 Microcontroller Simulator - Square Root Calculator in Assembly Language

Written an assembly code to calculate a square root of a number, and simulated on Motorola 68HC12 microcontroller simulator.

Org $0800

TopOfProgram:

lds #$0a00

ldx #16

ldy #OutputTable

ldd #0

std TestValue

MainLoop:

jsr Sqrt

std 2,y+

ldd TestValue

addd #4096

std TestValue

dbne x,MainLoop

BreakPoint: bra *

TestValue:   dc.w 0

***************************************************

Sqrt:

pshy

std Input

ldd #$8000

std Result

std Size

Loop:

ldd Result

tfr d,y

emul

Diamond:

cpy Input

blo NextSize

bne LowerResult

cpd #0

beq NextSize

LowerResult:

ldd Result

subd Size

std Result

NextSize:

lsr Size

ror Size+1

UpdateResult:

ldd Result

addd Size

std Result

LastDiamond:

ldd Size

bne Loop

ReturnResult:

ldd Result

puly

rts

***************************************************

ORG          $0900

OutputTable: dc.w 0,0,0,0,0,0,0,0

             dc.w 0,0,0,0,0,0,0,0

***************************************************

Input:       dc.w 0

Result:      dc.w 0

size:        dc.w 0

***************************************************