$include (c8051f020.inc)

        dseg at 30h
str_d:  ds      10h             ; reserve 16 bytes

        iseg at 80h
str_i:  ds      10h             ; reserve 16 bytes
stack:  ds      70h             ; reserve the rest for stack

        xseg
str_x:  ds      10h             ; reserve 16 bytes

        bseg
flag:   dbit    1               ; reserve 1 bit for flag

        cseg
        mov     wdtcn,#0DEh     ; Disable watchdog
        mov     wdtcn,#0ADh
        mov     r0,#255
clrall: mov     @r0,#0          ; clear all internal ram
        djnz    r0,clrall
        setb    flag            ; set flag bit
        mov     sp,#stack-1     ; initialize stack
        mov     dptr,#str_x     ; point dptr at str_x
        mov     r0,#str_d       ; point r0 at str_d
        mov     r1,#str_i       ; point r1 at str_i
        mov     r6,#10          ; copy all the bytes
        mov     r7,#str_c-pc_rel; pc relative offset to str_c
loop1:  mov     a,r7            ; offset to first (next) byte
        movc    a,@a+pc         ; actually get the byte
pc_rel: mov     @r0,a           ; store in str_d
        mov     @r1,a           ; store in str_i
        movx    @dptr,a         ; store in str_x
        inc     r0
        inc     r1              ; increment pointers
        inc     dptr
        inc     r7
        djnz    r6,loop1        ; loop 16 times
loop2:  sjmp    loop2           ; wait forever

str_c:  db	"Hello, Students", 0

        end