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Interchange of data blocks


#include "msp430.h"                     ; #define controlled include file

        NAME    main                    ; module name

        PUBLIC  main                    ; make the main label vissible
                                        ; outside this module
        ORG     0FFFEh
        DC16    init                    ; set reset vector to 'init' label

        RSEG    CSTACK                  ; pre-declaration of segment
        RSEG    CODE                    ; place program in 'CODE' segment

init:   MOV     #SFE(CSTACK), SP        ; set up stack

main:   NOP                             ; main program
        MOV.W   #WDTPW+WDTHOLD,&WDTCTL  ; Stop watchdog timer
        mov #30h,r4
        mov #40h,r5
        mov #7,r6
up:     mov.b @r4,r7
        mov.b @r5,r8
        mov.b r7,0(r5)
        mov.b r8,0(r4)
        inc r4
        inc r5
        dec r6
        jnz up
       
        JMP $                           ; jump to current location '$'
                                        ; (endless loop)
        END

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