pwm1.asm

51串口发送AT通讯指令测试程序

             ORG   0000H
             LJMP  MAIN
             org   000bh
             ljmp  int_t0
             ORG   001BH
             LJMP  INT_T1

             ORG   0050H
    int_t0:  SETB  P3.7
             mov   r6,40h
             djnz  r6,$
             reti

    INT_T1:  CLR    P3.7
             LCALL  LDELAY
             reti



    Ldelay:  mov   r6,41H
             djnz  r6,$
	     ret

             ORG    0100H
   MAIN:
	     mov tmod,#22h
	     mov th0,#109
	     mov tl0,#109
             MOV TH1,#200
             MOV TL1,#200
	     mov ie,#10000010B
             setb tr0
             ;SETB TR1

             MOV    40H,#1
             MOV    41H,#5
     
     loop:
             clr    p3.7
	     ljmp   loop

	  end