org 0000H
	ljmp 2000H
	org 001bH
	ajmp 100h
	org 100h
	

	mov th1,#0d8h
	mov tl1,#0f0h

	djnz 69h,tt1
	mov 69h,#100
	djnz 79H,tt1
	mov 79h,#30
	setb 3fh
	setb 5fh
	djnz 89h,tt1
	mov 89h,#5
	setb 4fh
tt1: reti
    org 2000h
    mov tmod,#10h
	 mov th1,#0d8h
	mov tl1,#0f0h
    mov ie,#88h
   
    	setb tr1
        MOV A,#01H
	MOV P1,A

	mov 69h,#100
	mov 79h,#30
	mov 89h,#5
	clr 3fh
    clr 4fh

tt: jnb 3fh,tt
    clr 3fh
jb 4fh,tt2
    CPL P1.0
    CPL P1.1		
	
    ajmp tt
 tt2: nop
  tt3: jnb 5fh,tt3
    clr 5fh 
    cpl P1.1
     
     ajmp tt2
DELLY:PUSH Acc
	PUSH B
	MOV A,#0fh
A3:	MOV B,#0fh
A4:	DEC A
	JNZ A4
	DJNZ B,A3
	POP Acc
	POP B
	RET
    end