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單片機(jī)控制AD9850的數(shù)字信號(hào)發(fā)生器C51程序

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//-----------------------函數(shù)聲明，變量定義------------------------------
#include <reg51.h>
#include <intrins.h>
#include<ABSACC.H>
//-----------------------定義管腳----------------------------------------
#define  data_OUT P1
sbit FQ_UD=P3^0;          //AD9850信號(hào)更新申請(qǐng)
sbit W_CLK=P3^1;          //寫控制字時(shí)鐘
unsigned char CON_word[5];
//Word    data[7]    data[6]    data[5]    data[4]    data[3]    data[2]    data[1]    data[0]
//W0     Phase b     Phase b3     Phase b2     Phase b1    Phase b0     Power Down     Control        Control
//W1    Freq-b31    Freq-b30    Freq-b29    Freq-b28    Freq-b27    Freq-b26    Freq-b25    Freq-b24
//W2    Freq-b23    Freq-b22    Freq-b21    Freq-b20    Freq-b19    Freq-b18    Freq-b17    Freq-b16
//W3    Freq-b15    Freq-b14    Freq-b13    Freq-b12    Freq-b11    Freq-b10    Freq-b9    Freq-b8
//W4    Freq-b7        Freq-b6        Freq-b5        Freq-b4        Freq-b3        Freq-b2
//--------------------------------------------------------------------------------------------------
// 函數(shù)名稱： delay
// 入口參數(shù)： N
// 函數(shù)功能：延時(shí)子程序，實(shí)現(xiàn)(16*N+24)us的延時(shí)
// 系統(tǒng)采用11.0592MHz的時(shí)鐘時(shí),延時(shí)滿足要求,其它情況需要改動(dòng)
//--------------------------------------------------------------------------------------------------
  void delay(unsigned  int N)
  {
  int i;
  for(i=0;i<N;i++);
  }
//--------------------------------------------------------------------------------------------------
// 函數(shù)名稱： WRITE_AD9850
// 函數(shù)功能：將控制字寫入AD9850
//--------------------------------------------------------------------------------------------------
void WRITE_AD9850(void)
{
     unsigned char i;
     FQ_UD=0;
     W_CLK=0;
     delay(0);
     CON_word[0]=CON_word[0]&0xFC; //置工作方式選擇位為00
     for(i=0;i<5;i++)
     {
     data_OUT=CON_word[i];      //送控制字
     W_CLK=0;
     delay(0);
     W_CLK=1;                   //上升延
     delay(0);
     }
     FQ_UD=1;               //上升延要求AD9850改變輸出
}
//--------------------------------------------------------------------------------------------------
// 函數(shù)名稱：main
// 用戶主函數(shù)
// 函數(shù)功能：主函數(shù)
//--------------------------------------------------------------------------------------------------
void main()
     {
     FQ_UD=0;
     WRITE_AD9850();
     }

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