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#pragma SMALL                  /* 預處理命令 */
//#pragma SRC
＃i nclude<stdio.h>                   
＃i nclude<reg51.h>    

#define DTMF_STEP_TAB 0x200
#define DTMF_NO_TAB 0X210
#define DTMF_SIN_TAB 0x220

#define DAC_PORT P0

#define CBYTE ((char *)0x050000)  //定義一個查表指針
//定義   名字   類型   0X05是查表區(qū) 0000是起始地址
//                     1==idata
//                     2==xdata
//                     3==pdata
//                     4==data
//                     5==code

                                       //DTMF OUTPORT

static unsigned char data H_step;                          //高頻步長寄存器
static unsigned char data L_step;                          //低頻步長寄存器
static unsigned char data H_ACC;                           //高頻幅度寄存器
static unsigned char data L_ACC;                           //低頻幅度寄存器
static unsigned char data H_DTMF;                          //高頻頻率寄存器
static unsigned char data L_DTMF;                          //低頻頻率寄存器
static unsigned char data DTMF_NO;                         //DTMF原碼
static unsigned char data DTMF_NO_BUF;                     //DTMF原碼寄存器