#include <c8051F020.h>
void SYSCLK_Init(void);
void UART0_Init(void);
void  Port_Init();
#define SYSCLK  22118400
#define BAUDRATE 9600
void main(void)
{
   unsigned char a=0x80;
  //關閉看門狗
  WDTCN = 0xDE;
  WDTCN = 0xAD;
//初始化系統(tǒng)時鐘和串口
//  SYSCLK_Init();
  UART0_Init();
  Port_Init();
  for(;;)
  {
  SBUF0=a;
  while(TI0==0);
  TI0=0;
  while(RI0==0);
  a=SBUF0;
  a++;
  }
  }
void SYSCLK_Init(void)
  {
  int i;
  //???????
  OSCXCN=0x67;
  //??????
  for(i=0;i<256;i++);
  //???????
  while(!(OSCXCN&0x80));
  //?????????,????????????
  OSCICN=0x88;
  }
  //******************UART0????1????????,???????1
  void UART0_Init(void)
  {
//?????
  TMOD=0x20;
  TH1=-SYSCLK/BAUDRATE/16;
  TL1=-SYSCLK/BAUDRATE/16;
  TR1=1;
  CKCON|=0x10;
//????????1
  SCON0|=0x50;PCON|=0x80;
//  ??????
  IE&=0xEF;
  }

   //?????
  void Port_Init(void)
  {
  XBR0=0x0c;
  XBR1=0x14;
  XBR2=0x46;
  P0MDOUT=0xe5;
  P1MDOUT=0xc4;
  P2MDOUT=0xff;
  P3MDOUT=0xff;
  P0|=0x1a;
  P1|=0x3b;
  }