Question

飞思卡尔mc9s12xs128单片机SCI有两组,怎么选用呢?

Answer 1

void SCI_Init(void)
{
SCI0BDH = 0X00; //Baud rate = 9600
SCI0BDL = 0X9C;
SCI0CR1 = 0X00;
SCI0CR2 = 0X2C; //启用接受中断 发送使能 接受使能
}
/**********************************************
*** SCI send data function ***
**********************************************/
void SCI_Send_Data(byte data)
{
while (!(SCI0SR1&0X80)){;} //wait TDRE置1，即等待发送
SCI0DRH = 0; //9-bit data format
SCI0DRL = data; //send data
}

/*================中断========================*/
#pragma CODE_SEG __NEAR_SEG NON_BANKED
void interrupt 20 SCI_Rx(void)
{
SCI0SR1_RDRF = 1;
//SCI0_Rx_Data = SCI0DRL;

}

SCI1类似，具体寄存器查看头文件或者数据手册吧！

Answer 2

做串口调试的时候雨两组都可以！只是设置会有些不同！