	NAME P7.8
	CSEG AT 0H
	ORG 0H
	MOV R2, #3
	MOV B, #167
	MOV A P1
	MOV R3, A
M1:	MOV R4, #135
	MOV A, R2
	MOV P2, A
	SETB 3.7
	CLR 3.7
	SETB 3.7
M2:	NOP
	DJNZ R4, M2
	MOV A, P1
	SUBB A, R3
	JC M3
	MOV A, P1
	MOV R3, A
	INC R2
	INC R2
	INC R2
	DJNZ B, M1
	AJMP M5
M3:	MOV R4, #135
	CLR C
	DEC R2
	MOV A, R2
	MOV P2, A
	SETB 3.7
	CLR 3.7
	SETB 3.7
M4:	NOP
	DJNZ R4, M4
	MOV A, P1
	SUBB A, R3
	MOV A, P1
	MOV R3, A
	JC M3
M5:	NOP
	END
