51单片机(AT89C52)D/A转换

#include

#define uchar unsigned char

#define uint unsigned int

sbit cs=P3^0;

sbit wr=P3^1;

void delayms(uint x)

{

uint y,z;

for(y=x;y>0;y--)

for(z=110;z>0;z--);

}

void main()

{

uchar temp;

cs=0;

wr=0;

while(1)

{

P2=temp;

delayms(25);

temp++;

}

}