fb.asm

多个仿真例子

GDP	BIT	00H
HL	EQU	30H
LL	EQU	31H
	ORG	0
	LJMP	START
	ORG	0BH
	LJMP	TS
	ORG	30H
START:	MOV	SP,#60H
	MOV	TMOD,#02H
	MOV	TH0,#9CH	;100us
	MOV	TL0,#9CH
	SETB	PT0
	SETB	ET0
	SETB	GDP
	MOV	0EH,#50
	MOV	0FH,#50
	CLR	P3.0
	SETB	P3.1
	SETB	TR0
	SETB	EA
LOOP:	SETB	P3.2
	MOV	C,P3.2
	JC	L1
	MOV	TH0,#38H
	SJMP	L2
L1:	MOV	TH0,#9CH
L2:	MOV	P1,#0FFH
	MOV	A,P1
	MOV	R0,A
	MOV	A,#200
	CLR	C
	SUBB 	A,R0
	JNC	L3
	MOV	A,#200
	SJMP	L4
L3:	MOV	A,R0
L4:	CLR	C
	RRC	A
	JNZ	L5
	CLR	P3.0
	SETB	P3.1
	CLR	TR0
	SJMP	LOOP
L5:	CJNE	A,#100,L6
	SETB 	P3.0
	CLR	P3.1
	CLR	TR0
	SJMP	LOOP
L6:	MOV	HL,A
	MOV	R0,A
	MOV	A,#100
	CLR	C
	SUBB	A,R0
	MOV	LL,A
	SETB	TR0
	SJMP	LOOP
TS:	PUSH	PSW
	SETB	RS0
	JNB	GDP,TT1
	DJNZ	R6,FINISH
	MOV	R6,HL
	CLR	GDP
	CLR	P3.0
	SETB	P3.1
TT1:	DJNZ	R7,FINISH
	MOV	R7,LL
	SETB	GDP
	SETB	P3.0
	CLR	P3.1
FINISH:	POP	PSW
	RETI
	END