h14.c

51单片机程序C和汇编

#define mode 0x82
xdata unsigned char CTL    _at_ 0x9003;
xdata unsigned char PA     _at_ 0x9000;
xdata unsigned char CS0809 _at_ 0x8000;

unsigned char Read0809()
{
  unsigned char i;

  CS0809 = 0;                // 起动 A/D
  for (i=0; i<0x20; i++) ;   // 延时 > 100us
  return(CS0809);            // 读入结果
}

main()
{
  unsigned char b;
  CTL = mode;
  while(1){
    b = Read0809();
    PA = b;
  }
}