使用PIC18F4520在Proteus上进行异步串行通信

你好，我使用的是PIC18F420和McC18库。我在proteus 8上对此进行了模拟。我想在虚拟终端上显示“u”字符5次。我已经把波特率设置为19200，并在虚拟终端上改变了它，因为它显示错误的字符到波特率设置为9600（默认值）。我必须在20MHz设置微，而我仍然是I。我得到了5个破折号，而不是Uuuu。你能帮助解释我为什么得到这个吗？-参见附件的源代码是：{ Trac-PracMaMatg配置文件OSC＝HS//SET OSC模式到HS高速时钟（Apple）；8F420.H＆GT；//设备使用的是PICF420α和延迟；H／GT；/ /包括延迟头空主（空隙）{TXSTAs= 0x24；/ /选择高波特率，8比特SPBRG＝64；// 19200 bPS，20MHz ClcTxxStestiTS.TXEN＝1；//发送EnabrSercStest.SPEN＝1；//启用串行端口（1）{同时（PrI1BIT.TXIF）＝0）{；} / /等到外围中断请求寄存器发送标志被设置/ /（发送完成，TxReg空）TxReg＝‘u’；Delay10ktCyx（50）；}



      以下为原文

    Hi,
I am using the PIC18f4520 and the MCC18 Library. I am simulating this on Proteus 8.
I want to display the 'U' character 5 times on the virtual terminal.
I have set the baud rate as 19200 and also changed it on the virtual terminal as it was displaying wrong characters to baud rate set as 9600 (default).
I have to set the micro at 20Mhz and I still I am getting 5 dashes ----- instead of UUUUU.

Can you help and explain why I am getting this?-see attached

The source code is:
#pragma config OSC = HS //set Osc mode to HS high speed clock
#pragma config WDT = OFF // set watchdog timer off
#pragma config LVP = OFF // Low Voltage Programming Off
#pragma config DEBUG = OFF // Compile without extra Debug compile Code
// Include Files
#include // Device used is the PICF4520
#include // Include delays headers
void main (void)
{
TXSTA = 0x24;// Select high baud rate, 8 bit
SPBRG = 64;// 19200 bps, 20MHz clock
TXSTAbits.TXEN = 1;// Transmit enable
RCSTAbits.SPEN = 1; // Enable serial port
while(1){
while (PIR1bits.TXIF == 0) {;} // Wait until Peripheral Interrupt Request Register Transmit Flag is set // (transmit complete, TXREG empty)
TXREG = 'U';
Delay10KTCYx(50);
}
}
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