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   DAC_PORT=0X80;                            //初始化輸出口
       DTMF_NO_BUF=DTMF_NO&0XF;                  //導(dǎo)入新數(shù)據(jù)
       L_step_ACC=0;                             //清除數(shù)據(jù)區(qū)
       H_step_ACC=0;
       L_DEC=0;                                  //清除標(biāo)志位
       H_DEC=0;
       L_CPL=0;
       H_CPL=0;
       ACC=CBYTE[DTMF_NO_TAB+DTMF_NO_BUF];        //;查DTMF高低頻率合成數(shù)據(jù)
   NO_ACC=ACC;
       H_DTMF=ACC&0XF;                            // ;分離高頻數(shù)據(jù)
       L_DTMF=NO_ACC>>4;                          //;分離低頻數(shù)據(jù)
       L_step=CBYTE[DTMF_STEP_TAB+L_DTMF];        //;求低頻步長
       H_step=CBYTE[DTMF_STEP_TAB+H_DTMF];        //;求高頻步長

SCANTAB:
       if (L_DEC==1) goto SUBTABL;                //;轉(zhuǎn)向反向查表   
       L_step_ACC=L_step_ACC+L_step;              //步長累加
       if (L_step_ACC<=144) goto continue_SCANL;  //未超出由繼續(xù)
       L_step_ACC=144-(L_step_ACC-144);                        //超出就轉(zhuǎn)反向掃描
       L_DEC=1;                                   //建立反向標(biāo)志
       goto continue_SCANL;

SUBTABL:
       L_step_ACC=L_step_ACC-L_step;
       if (L_step_ACC<=144) goto continue_SCANL;  //;低頻查表
       L_step_ACC=256-L_step_ACC;
       L_DEC=0;
       L_CPL=!L_CPL;
         
continue_SCANL:
       L_ACC=CBYTE[DTMF_SIN_TAB+L_step_ACC]+63;   //求低頻幅度
       if (L_CPL==1) L_ACC=255-L_ACC;             //結(jié)果取反
       L_ACC&=0x7f;                               //修正
       if (H_DEC==1) goto SUBTABH;                //;轉(zhuǎn)向反向查表           
       H_step_ACC=H_step_ACC+H_step;
       if (H_step_ACC<=144) goto continue_SCANH;
       H_step_ACC=144-(H_step_ACC-144);
       H_DEC=1;
       goto continue_SCANH;

SUBTABH:
       H_step_ACC=H_step_ACC-H_step;
       if (H_step_ACC<=144) goto continue_SCANH;    //;高頻查表
       H_step_ACC=256-H_step_ACC;
       H_DEC=0;
       H_CPL=!H_CPL;
        
continue_SCANH:
       H_ACC=CBYTE[DTMF_SIN_TAB+H_step_ACC]+63;
       if (H_CPL==1) H_ACC=255-H_ACC;          //結(jié)果取反
       H_ACC&=0X7F;                      
       DAC_PORT=H_ACC+L_ACC ;                  //;DTMF數(shù)據(jù)合成
DTMF_EXIT:
       return;
   }

TAB(){
#pragma asm

org DTMF_STEP_TAB
 DB 26,29,32,35,45,50,55,61;

org DTMF_NO_TAB
 DB 0X37,0X4,0X5,0X6,0X14,0X15,0X16,0X24,0X25;
 DB 0X26,0X35,0X34,0X36,0X7,0X17,0X27;

org  DTMF_SIN_TAB  //;T=65/(δ=90/144=0.625)采樣點(diǎn)的值
              DB 0 ,1 ,1 ,2 ,3 ,3 ,4 ,5 ,5 ,6 ;   //;0-9點(diǎn)
              DB 7 ,8 ,8 ,9 ,10,10,11,12,12,13;   //;10-19
              DB 14,14,15,16,16,17,18,18,19,20;   //;20-29
              DB 20,21,22,22,23,23,24,25,25,26;   //;30-39
              DB 27,27,28,28,29,30,30,31,32,32;   //;40-49
              DB 33,33,34,34,35,36,36,37,37,38;   //;50-59
              DB 38,39,39,40,40,41,42,42,43,43;   //;60-69
              DB 44,44,45,45,46,46,46,47,47,48;   //;70-79
              DB 48,49,49,50,50,50,51,51,52,52;   //;80-89
              DB 52,53,53,53,54,54,55,55,55,56;   //;90-99
              DB 56,56,57,57,57,57,58,58,58,58;   //;100-109
              DB 59,59,59,59,60,60,60,60,60,61;   //;110-119
              DB 61,61,61,61,62,62,62,62,62,62;   //;120-129
              DB 62,62,62,63,63,63,63,63,63,63;   //;130-139
              DB 63,63,63,63,63;                  //;140-144
#pragma endasm

            }