51单片机片外扩展RAM

{

0,1,2,3,4,5,6,7,8,9,

10,11,12,13,14,15,16,17,18,19,

20,21,22,23,24,25,26,27,28,29,

30,31,32,33,34,35,36,37,38,39,

40,41,42,43,44,45,46,47,48,49,

50,51,52,53,54,55,56,57,58,59,

60,61,62,63,64,65,66,67,68,69,

70,71,72,73,74,75,76,77,78,79,

80,81,82,83,84,85,86,87,88,89,

90,91,92,93,94,95,96,97,98,99

};

//延时ms函数：

void Delayms(unsigned int t)

{

unsigned int i,j;

for(i=t;i>0;i--)

for(j=120;j>0;j--);

}

//主函数：

int main(void)

{

unsigned char i;

oe=0;//使能RAM芯片片选和地址锁存器

for(i=0;i100;i++)

XBYTE[300+i]=ramdata[i];

//将100个数据写入片外RAM，起始地址为:300

while(1)

{

for(i=0;i100;i++)

{

P1=XBYTE[300+i];//从片外RAM读取数据，点亮P1口的8个LED

Delayms(500);

}

}

return 0;

}