void adf4113_data_input(unsigned long int data)//输入配置
{
unsigned long int temp;
unsigned int i;
temp=0x800000;
pll4113_clk=0;
pll4113_le=0;
delay100us(1);
for(i=0;i<24;i++)
{
     pll4113_clk=0;
  if(data&temp)
     {
           pll4113_data=1;
     }
     else 
     {
         pll4113_data=0;
     }
     temp=temp>>1;
  delay100us(1);
     pll4113_clk=1;
  delay100us(1);
}
pll4113_le=1;
delay100us(1);
pll4113_le=0;
}
void pll4113_init(void)
{
  adf4113_data_input(0xdf8003); //init
  adf4113_data_input(0xdf8002); //function.
     // 10.7mhz ref.
  adf4113_data_input(a_ref); // r
  adf4113_data_input(ab_counter); 
}
void pll4113_setfreq(unsigned long int freq)//设定频率
{
     unsigned long int value = 0;
     float pdf = 10000;
     float b,a;
     unsigned long int b_int, a_int;
     b = (float)freq/pdf/(float)(64);
     b_int = (unsigned long int)(b);
     a = (float)freq/pdf - (64*(float)b_int);
     a_int = (unsigned long int)(a);
     value = b_int<<8;
     value += a_int<<2;
     value += 1;
  adf4113_data_input(0xdf8006); //function. reset counter.
  adf4113_data_input(a_ref); // r
  adf4113_data_input(value); // ab 003e81
  adf4113_data_input(0xdf8002); //function.
}