流水灯，C语言版和汇编版

#include
#include
void delay(unsigned int c)
{
	 unsigned char a,b;
	 for(;c>0;c--)
	 for(b=38;b>0;b--)
	 for(a=130;a>0;a--)
	 ;
}
void main()
{
	unsigned char LED;
	LED=0xfe;
	while(1)
	{
	   P0=LED;
	   delay(50);
	   LED=LED<<1;
	   if(P0=0x00)
	   LED=0xfe;
	}
}

ORG 0000H ;程序从000H地址开始运行
AJMP MAIN ;跳转到 MAIN程序


ORG 030H  ;MAIN程序从030H开始运行
MAIN:
    MOV P0,#0FEH
ACALL DEL   ;调用延时子程序
MOV P0,#0FCH
ACALL DEL   ;调用延时子程序
MOV P0,#0F8H
ACALL DEL
MOV P0,#0F0H
ACALL DEL
MOV P0,#0E0H
ACALL DEL
MOV P0,#0C0H
ACALL DEL
MOV P0,#080H
ACALL DEL
MOV P0,#000H
ACALL DEL
MOV P0,#0FFH
AJMP MAIN   ;跳转到MAIN程序


; 延时子程序
DEL: MOV R5,#02H
DEL1: MOV R6,#0F0H
DEL2: MOV R7,#0F0H
DEL3: DJNZ R7, DEL3
DJNZ R6, DEL2
DJNZ R5, DEL1
RET
END