rs232_on_save.asm

簡單的串列埠自我測試持式 測試硬體電路是否正確

// BY 4000 ONLY

ORG	00H
MOV	TMOD,#00100000B
MOV	TH1,#230
MOV	TL1,#230
SETB	TR1

MOV	SCON,#01110000B
LOOP:	
ACALL	DELAY

CLR	RI
CLR	TI
MOV	SBUF,P1
WAIT1	JNB	TI,WAIT1
AJMP	LOOP
DELAY:	MOV	R6,#250
DL1:	MOV	R7,#200
DL2:	DJNZ	R7,DL2
	DJNZ	R6,DL1
	RET

END












































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