实验一：计数器实验
程序初始化
MOV DPTR,#TAB
定时器1和计数器0的设置
AJMP $
T1_INT: 定时器1赋初值
DJNZ R4,EXIT
MOV R4,#20
MOV A,TL0
MOV B,#10H
DIV AB
MOV 30H,B
MOV 31H,A
MOV A,TH0
MOV B,#10H
DIV AB
MOV 32H,B
MOV 33H,A
MOV A,30H
MOVC A,@A+DPTR
MOV R5,#8
ACALL DISPLAY
MOV A,31H
MOVC A,@A+DPTR
MOV R5,#8
ACALL DISPLAY
MOV A,32H
MOVC A,@A+DPTR
MOV R5,#8
ACALL DISPLAY
MOV A,33H
MOVC A,@A+DPTR
MOV R5,#8
ACALL DISPLAY
MOV TH0,#00H
MOV TL0,#00H
EXIT: 中断结束
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