晶振为20M的52,进行串口发送,为什么总出错啊?望各大侠指教

只看该作者 · 2007-12-17 13:10

程序:
#include <reg51.h>
#include <string.h>
void init_serialcomm(void)
{
    SCON  = 0x50;       //SCON: serail mode 1, 8-bit UART, enable ucvr
    TMOD |= 0x20;       //TMOD: timer 1, mode 2, 8-bit reload
    PCON |= 0x80;       //SMOD=1;
    TH1   = 0xFB;       //Baud:4800  fosc=11.0592MHz
    IE   |= 0x90;       //Enable Serial Interrupt
    TR1   = 1;          // timer 1 run
   // TI=1;
}
void send_char_com(unsigned char ch)
{
    SBUF=ch;
    while(TI==0);
    TI=0;
}
main()
{
init_serialcomm();

send_char_com('a');      }

结果如下图所示:

1万 · 2007-12-17 13:59

2万 · 2007-12-17 14:03

自己不会计算吗？

只看该作者 · 2007-12-17 15:26

#include <reg51.h>
#include <string.h>
void init_serialcomm(void)
{
    SCON  = 0x50;       //SCON: serail mode 1, 8-bit UART, enable ucvr
    TMOD |= 0x20;       //TMOD: timer 1, mode 2, 8-bit reload
    PCON |= 0x80;       //SMOD=1;
    TH1   = 0xF5;       //Baud:9600  fosc=120MHz
    IE   |= 0x90;       //Enable Serial Interrupt
    TR1   = 1;          // timer 1 run
   // TI=1;
}
void send_char_com(unsigned char  ch)
{
    SBUF=ch;
    while(TI==0);
    TI=0;
}
main()
{
init_serialcomm();

send_char_com('a');
能在电脑上显示字符'a',但总连续显示,我本来想让让单片机只发送一次,再次请教各位大侠,程序哪个地方设置的不对