初学汇编语言请大侠点拨。

以下我的程序
ORG 0000H
LJMP MAIN
ORG 0100H
MAIN：MOV A，#01H
MOV R1，#FFH
MOV R2,#08H
DJNz R1,$
DJNz R2,delay
RR A
MOV P0,A
RET
结果在Keil uVision2中编释后报错如:
1\Text1.asm(2): error A45: UNDEFINED SYMBOL (PASS-2)
1\Text1.asm(4): error A9: SYNTAX ERROR
1\Text1.asm(4): error A3: ILLEGAL CHARACTER
1\Text1.asm(4): error A3: ILLEGAL CHARACTER
1\Text1.asm(4): error A3: ILLEGAL CHARACTER
1\Text1.asm(4): error A3: ILLEGAL CHARACTER
1\Text1.asm(5): error A9: SYNTAX ERROR
1\Text1.asm(5): error A9: SYNTAX ERROR
1\Text1.asm(5): error A9: SYNTAX ERROR
1\Text1.asm(8): error A45: UNDEFINED SYMBOL (PASS-2)
1\Text1.asm(11): warning A41: MISSING 'END' STATEMENT

答案：ORG 0000H
LJMP MAIN
ORG 0100H
MAIN:MOV A,#01H	   //这个逗号输入法是错的
delay:MOV R1,#0FFH	//这个逗号输入法是错的，还有立即数改为0FFH ，再加个delay就对了
MOV R2,#08H
DJNz R1,$
DJNz R2,delay
RR A
MOV P0,A
RET

其他：ORG 0000H
		LJMP MAIN
		ORG 0080H
	MAIN:MOV A,#01H
		MOV R2,#08H
	    D:
	    RR A
		MOV P0,A
		CALL delay
		DJNZ R2,D
		ORG 0160h
	delay:	MOV R1,#00H
	    D1: MOV R3,#00h
		D2: DJNZ R3,D2
		DJNZ R1,D1
		RET
        END
//你是不是想写流水灯啊，P0口要上拉电阻哦。 

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