m_bfp.a

基于Intel 8253定时器的两端Asm

            ORG 00H
	    LJMP START;
            ORG 30H
                                     
START: 	    MOV A,#30H;
	    MOV P0,A;

           
NEXT1:      SETB  P2.1;
            LCALL DELAY_01MIN_A;
	    CPL P2.1;
	    LCALL DELAY_01MIN_A;
            SJMP NEXT1;



			
DELAY_01MIN_A:          MOV R6,#4;				
L1:			MOV R7,#248;
			DJNZ R7,$;
			DJNZ R6,L1;
			RET
            END