da_conv.asm

本资源包含了单片机键盘、a/d、频率测试等源代码

         org 0000h
      ajmp dapro

      org 100h
dapro: mov a,#19h  ;X10
      mov 51h,a
      mov a,#0ah
      mov 50h,a
      mov dptr, #7fffh
      mov a,51h
      movx @dptr,a
      mov dptr,#3fffh
      mov a,50h
      movx @dptr,a
      mov dptr,#1fffh
      mov a,50H
      movx @dptr,a
      acall delay

      mov a,#02h  ;X10
      mov 51h,a
      mov a,#09h
      mov 50h,a
      mov dptr, #7fffh
      mov a,51h
      movx @dptr,a
      mov dptr,#3fffh
      mov a,50h
      movx @dptr,a
      mov dptr,#1fffh
      mov a,50H
      movx @dptr,a
      acall delay


      ajmp dapro

delay:mov r3,#250
d3:   mov r4,#100
d2:   mov r5,#200
d1:   nop
      nop
      djnz r5,d1
      djnz r4,d2
      djnz r3,d3
      ret
      end