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標題: STC12C單片機串口通信波特率怎么設置9600 [打印本頁]

作者: environmentx 時間: 2016-4-1 17:52
標題: STC12C單片機串口通信波特率怎么設置9600
選工作方式2，波特率怎么設置？晶振11.0592的

作者: liuyimao485812 時間: 2016-4-5 13:52
SCON = 0x50; //8位數據,可變波特率
AUXR |= 0x40; //定時器1時鐘為Fosc,即1T
AUXR &= 0xFE; //串口1選擇定時器1為波特率發生器
TMOD &= 0x0F; //設定定時器1為16位自動重裝方式
TL1 = 0xE0; //設定定時初值
TH1 = 0xFE; //設定定時初值
ET1 = 0; //禁止定時器1中斷
TR1 = 1; //啟動定時器1

作者: liuyimao485812 時間: 2016-4-5 13:53
SCON = 0x50; //8位數據,可變波特率
AUXR |= 0x40; //定時器1時鐘為Fosc,即1T
AUXR &= 0xFE; //串口1選擇定時器1為波特率發生器
TMOD &= 0x0F; //設定定時器1為16位自動重裝方式
TL1 = 0xE0; //設定定時初值
TH1 = 0xFE; //設定定時初值
ET1 = 0; //禁止定時器1中斷
TR1 = 1; //啟動定時器1

作者: 用戶21111688 時間: 2016-4-5 20:32
/*------------------------------------------------------------------*/ /* --- STC MCU Limited ---------------------------------------------*/ /* --- STC12C5Axx Series MCU UART (8-bit/9-bit)Demo ----------------*/ /* --- Mobile: (86)13922805190 -------------------------------------*/ /* --- Fax: 86-755-82905966 ----------------------------------------*/ /* --- Tel: 86-755-82948412 ----------------------------------------*/ /* --- Web: www.STCMCU.com -----------------------------------------*/ /* If you want to use the program or the program referenced in the */ /* article, please specify in which data and procedures from STC */ /*------------------------------------------------------------------*/ #include "reg51.h" #include "intrins.h" typedef unsigned char BYTE; typedef unsigned int WORD; #define FOSC 18432000L //System frequency #define BAUD 9600 //UART baudrate /*Define UART parity mode*/ #define NONE_PARITY 0 //None parity #define ODD_PARITY 1 //Odd parity #define EVEN_PARITY 2 //Even parity #define MARK_PARITY 3 //Mark parity #define SPACE_PARITY 4 //Space parity #define PARITYBIT EVEN_PARITY //Testing even parity sbit bit9 = P2^2; //P2.2 show UART data bit9 bit busy; void SendData(BYTE dat); void SendString(char *s); void main() { #if (PARITYBIT == NONE_PARITY) SCON = 0x50; //8-bit variable UART #elif (PARITYBIT == ODD_PARITY) || (PARITYBIT == EVEN_PARITY) || (PARITYBIT == MARK_PARITY) SCON = 0xda; //9-bit variable UART, parity bit initial to 1 #elif (PARITYBIT == SPACE_PARITY) SCON = 0xd2; //9-bit variable UART, parity bit initial to 0 #endif TMOD = 0x20; //Set Timer1 as 8-bit auto reload mode TH1 = TL1 = -(FOSC/12/32/BAUD); //Set auto-reload vaule TR1 = 1; //Timer1 start run ES = 1; //Enable UART interrupt EA = 1; //Open master interrupt switch SendString("STC12C5A60S2\r\nUart Test !\r\n"); while(1); } /*---------------------------- UART interrupt service routine ----------------------------*/ void Uart_Isr() interrupt 4 using 1 { if (RI) { RI = 0; //Clear receive interrupt flag P0 = SBUF; //P0 show UART data bit9 = RB8; //P2.2 show parity bit } if (TI) { TI = 0; //Clear transmit interrupt flag busy = 0; //Clear transmit busy flag } } /*---------------------------- Send a byte data to UART Input: dat (data to be sent) Output:None ----------------------------*/ void SendData(BYTE dat) { while (busy); //Wait for the completion of the previous data is sent ACC = dat; //Calculate the even parity bit P (PSW.0) if (P) //Set the parity bit according to P { #if (PARITYBIT == ODD_PARITY) TB8 = 0; //Set parity bit to 0 #elif (PARITYBIT == EVEN_PARITY) TB8 = 1; //Set parity bit to 1 #endif } else { #if (PARITYBIT == ODD_PARITY) TB8 = 1; //Set parity bit to 1 #elif (PARITYBIT == EVEN_PARITY) TB8 = 0; //Set parity bit to 0 #endif } busy = 1; SBUF = ACC; //Send data to UART buffer } /*---------------------------- Send a string to UART Input: s (address of string) Output:None ----------------------------*/ void SendString(char *s) { while (*s) //Check the end of the string { SendData(*s++); //Send current char and increment string ptr } }

作者: 1330085384 時間: 2018-5-6 21:11

TMOD=0x20; //定時器1工作在方式2  8位自動重裝
SCON=0x50; //串口1工作在方式1  10位異步收發 REN=1允許接收
TH1=0xFD;          //定時器1初值  9600BIT
TL1=0xFD;
TR1=1;          //定時器1開始計數
RI=0;
EA=1;       //開總中斷
ES=1;       //開串口1中斷

作者: daisir 時間: 2020-4-24 17:31
SCON = 0x50;             //8位數據,可變波特率
      AUXR |= 0x40;             //定時器1時鐘為Fosc,即1T
      AUXR &= 0xFE;             //串口1選擇定時器1為波特率發生器
      TMOD &= 0x0F;             //設定定時器1為16位自動重裝方式
      TL1 = 0xE0;             //設定定時初值
      TH1 = 0xFE;             //設定定時初值
      ET1 = 0;             //禁止定時器1中斷
      TR1 = 1;             //啟動定時器1

作者: 指尖螺 時間: 2020-5-16 23:09
void UART_INIT()
{
      SM0 = 0;
      SM1 = 1;
      REN = 1;
      EA = 1;
      ES = 1;
      TMOD = 0x20;
      TH1 = 0xfd;
      TL1 = 0xfd;
      TR1 = 1;
}

作者: TTQ001 時間: 2020-5-17 01:35
試一下使用以下配置:

void init_com( void )
{
SCON = 0x50 ; //串口工作方式1，8位UART，波特率可變
TMOD |= 0x20 ; //定時器1，工作方式2，自動再裝入8位定時器
PCON |= 0x80 ; //SMOD=1; 波特率加倍
TH1 = 0xfa ; //波特率:9600 晶振=11.0592MHz
IE |= 0x90 ; //使能串口中斷
TR1 = 1 ; // 定時器1開始
}

作者: 2983606955 時間: 2020-9-3 09:56
SCON=0X50; //設置為工作方式1 ,既然是方式一，自然要確定波特率，設置定時器1
TMOD|=0X20;//8位重裝載
PCON|=0x00;
TH1=0xfa;//波特率9600
TL1=0xfa;
RI=1;
TI=1;
ES=1; //打開通信中斷
EA=1; //打開總中斷
TR1=1;

作者: pcf2000 時間: 2020-9-3 12:24
學會看資料，一般資料里都有介紹使用，串口波特率一般都會指定一個定時器來產生，設置好定時器的計數周期，也就是波特率就可以了

作者: 梁廷明 時間: 2020-9-3 17:25
SCON = 0x50; //8-bit variable UART

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