你好像剛入門或還沒入門，提出這樣的問題，再加上你給出的信息太少，真的是都很難幫到你。
范例程序。
- /*---------------------------------------------------------------------*/
- /* --- STC MCU Limited ------------------------------------------------*/
- /* --- STC15F2K60S2 系列 定時器1用作串口1的波特率發生器舉例------------*/
- /* --- Mobile: (86)13922805190 ----------------------------------------*/
- /* --- Fax: 86-0513-55012956,55012947,55012969 ------------------------*/
- /* --- Tel: 86-0513-55012928,55012929,55012966-------------------------*/
- /* --- Web: www.STCMCU.com --------------------------------------------*/
- /* --- Web: www.GXWMCU.com --------------------------------------------*/
- /* 如果要在程序中使用此代碼,請在程序中注明使用了STC的資料及程序 */
- /* 如果要在文章中應用此代碼,請在文章中注明使用了STC的資料及程序 */
- /*---------------------------------------------------------------------*/
- //本示例在Keil開發環境下請選擇Intel的8058芯片型號進行編譯
- //若無特別說明,工作頻率一般為11.0592MHz
- #include "reg51.h"
- #include "intrins.h"
- typedef unsigned char BYTE;
- typedef unsigned int WORD;
- #define FOSC 11059200L //系統頻率
- #define BAUD 115200 //串口波特率
- #define NONE_PARITY 0 //無校驗
- #define ODD_PARITY 1 //奇校驗
- #define EVEN_PARITY 2 //偶校驗
- #define MARK_PARITY 3 //標記校驗
- #define SPACE_PARITY 4 //空白校驗
- #define PARITYBIT NONE_PARITY //定義校驗位
- sfr P0M1 = 0x93;
- sfr P0M0 = 0x94;
- sfr P1M1 = 0x91;
- sfr P1M0 = 0x92;
- sfr P2M1 = 0x95;
- sfr P2M0 = 0x96;
- sfr P3M1 = 0xb1;
- sfr P3M0 = 0xb2;
- sfr P4M1 = 0xb3;
- sfr P4M0 = 0xb4;
- sfr P5M1 = 0xC9;
- sfr P5M0 = 0xCA;
- sfr P6M1 = 0xCB;
- sfr P6M0 = 0xCC;
- sfr P7M1 = 0xE1;
- sfr P7M0 = 0xE2;
- sfr AUXR = 0x8e; //輔助寄存器
- sfr P_SW1 = 0xA2; //外設功能切換寄存器1
- #define S1_S0 0x40 //P_SW1.6
- #define S1_S1 0x80 //P_SW1.7
- sbit P22 = P2^2;
- bit busy;
- void SendData(BYTE dat);
- void SendString(char *s);
- void main()
- {
- P0M0 = 0x00;
- P0M1 = 0x00;
- P1M0 = 0x00;
- P1M1 = 0x00;
- P2M0 = 0x00;
- P2M1 = 0x00;
- P3M0 = 0x00;
- P3M1 = 0x00;
- P4M0 = 0x00;
- P4M1 = 0x00;
- P5M0 = 0x00;
- P5M1 = 0x00;
- P6M0 = 0x00;
- P6M1 = 0x00;
- P7M0 = 0x00;
- P7M1 = 0x00;
- ACC = P_SW1;
- ACC &= ~(S1_S0 | S1_S1); //S1_S0=0 S1_S1=0
- P_SW1 = ACC; //(P3.0/RxD, P3.1/TxD)
-
- // ACC = P_SW1;
- // ACC &= ~(S1_S0 | S1_S1); //S1_S0=1 S1_S1=0
- // ACC |= S1_S0; //(P3.6/RxD_2, P3.7/TxD_2)
- // P_SW1 = ACC;
- //
- // ACC = P_SW1;
- // ACC &= ~(S1_S0 | S1_S1); //S1_S0=0 S1_S1=1
- // ACC |= S1_S1; //(P1.6/RxD_3, P1.7/TxD_3)
- // P_SW1 = ACC;
- #if (PARITYBIT == NONE_PARITY)
- SCON = 0x50; //8位可變波特率
- #elif (PARITYBIT == ODD_PARITY) || (PARITYBIT == EVEN_PARITY) || (PARITYBIT == MARK_PARITY)
- SCON = 0xda; //9位可變波特率,校驗位初始為1
- #elif (PARITYBIT == SPACE_PARITY)
- SCON = 0xd2; //9位可變波特率,校驗位初始為0
- #endif
- AUXR = 0x40; //定時器1為1T模式
- TMOD = 0x00; //定時器1為模式0(16位自動重載)
- TL1 = (65536 - (FOSC/4/BAUD)); //設置波特率重裝值
- TH1 = (65536 - (FOSC/4/BAUD))>>8;
- TR1 = 1; //定時器1開始啟動
- ES = 1; //使能串口中斷
- EA = 1;
- SendString("STC15F2K60S2\r\nUart Test !\r\n");
- while(1);
- }
- /*----------------------------
- UART 中斷服務程序
- -----------------------------*/
- void Uart() interrupt 4 using 1
- {
- if (RI)
- {
- RI = 0; //清除RI位
- P0 = SBUF; //P0顯示串口數據
- P22 = RB8; //P2.2顯示校驗位
- }
- if (TI)
- {
- TI = 0; //清除TI位
- busy = 0; //清忙標志
- }
- }
- /*----------------------------
- 發送串口數據
- ----------------------------*/
- void SendData(BYTE dat)
- {
- while (busy); //等待前面的數據發送完成
- ACC = dat; //獲取校驗位P (PSW.0)
- if (P) //根據P來設置校驗位
- {
- #if (PARITYBIT == ODD_PARITY)
- TB8 = 0; //設置校驗位為0
- #elif (PARITYBIT == EVEN_PARITY)
- TB8 = 1; //設置校驗位為1
- #endif
- }
- else
- {
- #if (PARITYBIT == ODD_PARITY)
- TB8 = 1; //設置校驗位為1
- #elif (PARITYBIT == EVEN_PARITY)
- TB8 = 0; //設置校驗位為0
- #endif
- }
- busy = 1;
- SBUF = ACC; //寫數據到UART數據寄存器
- }
- /*----------------------------
- 發送字符串
- ----------------------------*/
- void SendString(char *s)
- {
- while (*s) //檢測字符串結束標志
- {
- SendData(*s++); //發送當前字符
- }
- }
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