设计ADC0809与单片机8031的硬件接口，并编写A/D转换程序？谢谢

#include "reg51.h" #define data_point P0 sbit EOC=P2^0; sbit ADDA=P2^1; sbit ADDB=P2^2; sbit ADDC=P2^3; sbit OE=P2^5; sbit START=P2^6; sbit CLK=P2^7; sbit ALE=P2^6; unsigned char disp[3]={0,0,0}; char code dispcode[]={0xc0,0xf9,0xa4,0