1.
#include <reg52.h>
//#define uchar unsigned char
//uchar receive;
void main(void)
{
EA = 1; //允许总中断(如不使用中断,可用//屏蔽)
ES = 1; //允许UART串口的中断
TMOD = 0x20; //定时器T/C1工作方式2
SCON = 0x50; //串口工作方式1,允许串口接收(SCON = 0x40 时禁止串口接收)
TH1 = 0xF3; //定时器初值高8位设置 //12MHZ晶振,波特率为4800 0xf3
TL1 = 0xF3; //定时器初值低8位设置 //11.0592MHZ晶振,波特率为4800 0xf4 9600 0xfa 19200 0xfd
PCON = 0x80; //波特率倍频(屏蔽本句波特率为2400)
TR1 = 1; //定时器启动
while(1);
}
void tranData() interrupt 4
{
SBUF='1';
while(TI==0);
TI=0;
RI=0; // 将此句注释掉,查看效果.
}
2. 键盘输入
#include <reg52.h>
#define uchar unsigned char
uchar uc;
void main(void)
{
EA = 1; //允许总中断(如不使用中断,可用//屏蔽)
ES = 1; //允许UART串口的中断
TMOD = 0x20; //定时器T/C1工作方式2
SCON = 0x50; //串口工作方式1,允许串口接收(SCON = 0x40 时禁止串口接收)
TH1 = 0xF3; //定时器初值高8位设置 //12MHZ晶振,波特率为4800 0xf3
TL1 = 0xF3; //定时器初值低8位设置 //11.0592MHZ晶振,波特率为4800 0xf4 9600 0xfa 19200 0xfd
PCON = 0x80; //波特率倍频(屏蔽本句波特率为2400)
TR1 = 1; //定时器启动
while(1);
}
void tranData() interrupt 4
{
uc=SBUF;
SBUF=uc;
while(TI==0);
TI=0;
RI=0;
}
3.
1 #include <reg52.h> 2 #define uchar unsigned char 3 4 uchar receive; 5 6 7 void main(void) 8 { 9 EA = 1; //允许总中断(如不使用中断,可用//屏蔽) 10 ES = 1; //允许UART串口的中断 11 TMOD = 0x20; //定时器T/C1工作方式2 12 SCON = 0x50; //串口工作方式1,允许串口接收(SCON = 0x40 时禁止串口接收) 13 TH1 = 0xF3; //定时器初值高8位设置 //12MHZ晶振,波特率为4800 0xf3 14 TL1 = 0xF3; //定时器初值低8位设置 //11.0592MHZ晶振,波特率为4800 0xf4 9600 0xfa 19200 0xfd 15 PCON = 0x80; //波特率倍频(屏蔽本句波特率为2400) 16 TR1 = 1; //定时器启动 17 while(1); 18 19 } 20 21 void tranData() interrupt 4 22 { 23 uchar i; 24 if(RI) 25 { 26 RI=0; 27 receive=SBUF; 28 if(receive==0x31) 29 { 30 for(i=0;i<4;i++) 31 { 32 SBUF='a'; 33 while(!TI); 34 TI=0; 35 } 36 } 37 else if(receive==0x32) 38 { 39 for(i=0;i<4;i++) 40 { 41 SBUF='b'; 42 while(!TI); 43 TI=0; 44 } 45 } 46 } 47 } 48 49