readmac.a51

来自「c51中嵌入asm的程序段」· A51 代码 · 共 47 行

NAME	READMAC

?PR?ReadMac?READMAC    SEGMENT CODE 
	PUBLIC	ReadMac

	RSEG  ?PR?ReadMac?READMAC
ReadMac:
	USING	0
WAIT1:
	MOV  	DPTR,#04000H

;     MOV     R4,#0FFH

;LOOP2:
;        DEC R4
;        MOV A,R4
;        JZ WAIT3
        MOV R3,#0FFH

LOOP1:
        DEC R3
        MOV A,R3
        JZ WAIT3
        MOV R2,#0FFH
WAIT2:
        DEC   R2
        MOV   A,R2
        JZ    LOOP1
        
	MOVX 	A,@DPTR
        JNB  	ACC.2,WAIT2


	MOV  	DPTR,#02000H

	MOVX 	A,@DPTR
	MOV  	R7,A
	SJMP    WAIT4
WAIT3:
       MOV R7,#00H

WAIT4:
        
        RET

	END