定时计数.asm

AD AND TLC549 TLC548C, TLC548I, TLC549C, TLC549I

ORG  0000H
      	AJMP  MAIN
      	ORG  000BH
      	AJMP  IINT0
      	ORG  0030H
MAIN: 	MOV  R4,#00H
      	MOV  R6,#10
      	MOV  TMOD,#61H
      	MOV  TL0,#LOW(-50000)
      	MOV  TH0,#HIGH(-50000)
      	MOV  IE,#82H
      	SETB  TR0
      	MOV  TL1,#0
      	MOV  TH1,#0
      	SETB  TR1
DISP:	MOV  A,TL1
      	CPL A
      	MOV P1,A
      	SJMP DISP

IINT0:	PUSH ACC
      	PUSH PSW
      	MOV TL0,#LOW(-50000)
      	MOV TH0,#HIGH(-50000)
      	DJNZ R6,LOOP3
      	CPL P3.0
     	MOV R6,#10
LOOP3:	POP PSW
      	POP ACC
      	RETI
      	END