Motorola M68CPU32BUG Manual do Utilizador descarregar pdf (Página 31)

APPENDIX 6

A sample MC68000 assembly language program.

* Program 1 - Find the maximum value of an array of number

* T. Obuchowicz

* October 29, 2008

ORG $3000

RSLT DS.B 1 * reserve 1 byte of storage to hold the result

ARRAY DC.B 2,5,1,4,3 * declare byte sized constants

ORG $5000

CLR.L D0

CLR.L D1

MOVE.L #4,D0 * setup D0 as a counter

MOVEA.L #ARRAY,A0

MOVE.B (A0),D1 * get first element of array

LOOP CMP.B (A0)+,D1

BGT BIGGER

MOVE.B -1(A0),D1

BIGGER DBRA D0,LOOP

MOVE.B D1,RSLT

END

NOTE: If you intend the run the program using the GO command, add the two lines

TRAP #15

DC.W $63

as the last two instructions before the END assembler directive.

1 2 ... 26 27 28 29 30 31 32 33 34 35

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Motorola M68CPU32BUG Manual do Utilizador Página 31