ORG 00H LJMP START ORG 0BH LJMP COUNTER ORG 30H MOV SP,#50H MOV A,TMOD ANL A,#11110000B ORL A,#00000000B MOV TMOD,A MOV THO,(8192-100)/32 MOV TL0,(8192-100).MOD.32 CLR TF0 SETB IE.1 SETB IE .7 SETB . TR0 MOV A,#0 L1: NOP JMP L1 COUNTER： CRL IE.1 MOV TH0,#(8192-100)/32 MOV TL0,#(8192-100).MOD.32 CJNE A,#0,COUNT1 CLR P3.5 MOV A,#1 SETB IE.1 RETI COUNTI: SETB P3.5 MOV A,#0 SETB IE.1 RETI END