af_ini.asm

一个秒表的程序

$include (c8051f000.inc)					; Include regsiter definition file.
$include (TP.inc)									; Include TP definition file.	

PROG  segment  CODE
CONST segment  CODE
PUBLIC   	af_ini

          rseg  PROG
af_ini:		clr		EN_af
					LCALL att
					clr		RS_af
					MOV		DPTR,#init_af
					MOV		R6,#12
af_en:		CLR		A
					MOVC	A,@A+DPTR
					INC		DPTR
					MOV		P2,A
					SETB	EN_af
					LCALL	att
					CLR		EN_af
					MOV   R5,#40		;attente de 1 milli secondes.
af_en1:		MOV   R4,#00
					DJNZ  R4,$
					DJNZ  R5,af_en1
					DJNZ	R6,af_en
					SETB	RS_af
					RET
att:			MOV		R5,#4
					DJNZ	R5,$
					RET
				  	rseg  CONST   
init_af:				DB  3EH,3EH,3EH,2EH,0EH,0EEH,0EH,2EH,0EH,1EH,0EH,6EH
; ************************************************************
; End of file.
END