0832-t.asm

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       ORG 00A0H
START: MOV DPTR,#0FEFFH
   L1: MOV A,#00H
   UP: INC A
       MOVX @DPTR,A
       CJNE A,#0BBH,L3
   L3: JC UP
 DOWN: LCALL DELAY
   L2: DEC A
       MOVX @DPTR,A
       CJNE A,#00H,L4
   L4: JC L1
       SJMP L2
DELAY: MOV R3,#100
   D1: NOP
       NOP
       NOP
       NOP
       NOP
       DJNZ R3,D1
       RET
       END