下面是汇编程序源码，可以用按键来控制
org 0000h
ajmp main
 org 0030h
main:mov   a,#00h
clr p1.0
clr p1.1
jnb p3.0, zhengxuan
jnb p3.1,juchi
jnb p3.2,sanjiao
sjmp MAIN

 sanjiao:
            mov   a,#00h
    clr  p1.0
    clr  p1.1
    loop:
      mov   p0,a
       inc  a
        mov r0,#10h
                 djnz   r0,$
           jnb p3.0 , zhengxuan
 jnb p3.1,juchi      
           sjmp  loop

    ret

juchi:mov   a,#00h
clr p1.0
clr p1.1
up :  mov p0,a
inc a
jnb p3.0,   zhengxuan
jnb p3.2,   sanjiao
jnz up
down: dec a
mov p0,a
jnb p3.0 , zhengxuan
jnb p3.2,sanjiao
jnz down
sjmp up
ret

 zhengxuan:mov R5,#00h
sin:mov a,r5
clr p1.0
clr p1.1
     mov DPTR,#TAB
     MOVC A,@A+DPTR

     MOV P0,A
     INC R5
 jnb p3.1,juchi
 jnb p3.2,sanjiao
   AJMP  SIN
  TAB: DB 80H,83H,86H,89H,8DH,90H,93H,96H
       DB 99H,9CH,9FH,0A2H,0A5H,0A8H,0ABH,0AEH
       DB 0B1H,0B4H,0B7H,0BAH,0BCH,0BFH,0C2H,0C5H
       DB 0C7H,0CAH,0CCH,0CFH,0D1H, 0D4H,0D6H,0D8H
       DB 0DAH,0DDH,0DFH,0E1H,0E3H, 0E5H,0E7H,0E9H
       DB 0EAH,0ECH,0EEH,0EFH,0F1H, 0F2H,0F4H,0F5H
       DB 0F6H,0F7H,0F8H,0F9H,0FAH, 0FBH,0FCH,0FDH
       DB 0FDH,0FEH,0FFH,0FFH,0FFH, 0FFH,0FFH,0FFH
       DB 0FFH,0FFH,0FFH,0FFH,0FFH, 0FFH,0FEH,0FDH
       DB 0FDH,0FCH,0FBH,0FAH,0F9H, 0F8H,0F7H,0F6H
       DB 0F5H,0F4H,0F2H,0F1H,0EFH, 0EEH,0ECH,0EAH
       DB 0E9H,0E7H,0E5H,0E3H,0E1H, 0DEH,0DDH,0DAH
       DB 0D8H,0D6H,0D4H,0D1H,0CFH, 0CCH,0CAH,0C7H
       DB 0C5H,0C2H,0BFH,0BCH,0BAH, 0B7H,0B4H,0B1H
       DB 0AEH,0ABH,0A8H,0A5H,0A2H, 9FH, 9CH, 99H
       DB 96H, 93H, 90H, 8DH, 89H, 86H, 83H, 80H
       DB 80H, 7CH, 79H, 78H, 72H, 6FH, 6CH, 69H
       DB 66H, 63H, 60H, 5DH, 5AH, 57H, 55H, 51H
       DB 4EH, 4CH, 48H, 45H, 43H, 40H, 3DH, 3AH
       DB 38H, 35H, 33H, 30H, 2EH, 2BH, 29H, 27H
       DB 25H, 22H, 20H, 1EH, 1CH, 1AH, 18H, 16H
       DB 15H, 13H, 11H, 10H, 0EH, 0DH, 0BH, 0AH
       DB 09H, 08H, 07H, 06H, 05H, 04H, 03H, 02H
       DB 02H, 01H, 00H, 00H, 00H, 00H, 00H, 00H
       DB 00H, 00H, 00H, 00H, 00H, 00H, 01H, 02H
       DB 02H, 03H, 04H, 05H, 06H, 07H, 08H, 09H
       DB 0AH, 0BH, 0DH, 0EH, 10H, 11H, 13H, 15H
       DB 16H, 18H, 1AH, 1CH, 1EH, 20H, 22H, 25H
       DB 27H, 29H, 2BH, 2EH, 30H, 33H, 35H, 38H
       DB 3AH, 3DH, 40H, 43H, 45H, 48H, 4CH, 4EH
       DB 51H, 55H, 57H, 5AH, 5DH, 60H, 63H, 66H
       DB 69H, 6CH, 6FH, 72H, 76H, 79H, 7CH, 80H
      ret

end