1寄存器
           1）特殊功能寄存器
                             

            2）存儲(chǔ)器
                            

  2 定時(shí)與中斷
                                1）定時(shí)與計(jì)數(shù)設(shè)置
                                     

                         2）中斷設(shè)置
                                
 
單片機(jī)中斷程序，T1中斷
ORG 0000h
Ljmp main
clr a
mov r7,#00h
ORG 0013h
main: setb EA
      setb ET1
      setb PT1
      mov TMOD,#0e0h
      setb TR1
      mov p0,TL1
      jnb p1.7,DD1
      sjmp ddd
DD1: MOV R5,#00H
DD2: mov r4,#80h
     DJNZ R4,$
     djnz r5,dd2
     JNB P1.7,jjj
      sjmp ddd
jjj:mov r3,#00h
    djnz r3,$
    inc r7
    add a,#01h
    da a
    mov p0,a
    mov p2,a
    inc r7
    cjne r7,#99D,ddd
ddd:nop
 end
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