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求助

一个简单的串行口测试,但是没有成功,程序如下:
#include
#include
void S0() interrupt 4 using 2
{
if (RI)
{RI = 0;SBUF += 1;}
else
if (TI) {TI =0; SBUF += 1;}
}
void main (void)
{
P3 = 0x3d;
SCON = 0x58; //1101 1000
TMOD = 0x20; //Timer1 Mode 2;
TH1 = 0xfd; //9600
TL1 = 0xfd;
PS = 1;
TR1 = 1; //Enable Timer1
IE = 0x90;
TI =1;
while (1){}
}
关键词: 求助
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