2. UART程序设计与电路仿真

使用UART1来输出字符“An ARM7 Example LPC2138 By IMU 2011-04-20 23:55:07”

首先根据要求初始化串口0，运用PINSEL0寄存器设置UART0的初始化接口P0.0、P0.1。使用U0LCR设置波特率，将数据长度定义为8位数据位，通过Fpclk运算，使用U0DLM寄存器设置分频寄存器的高字节，使用U0DLL寄存器设置分频寄存器的低字节。使用控制寄存器U0CLR控制器设置通信模式，完成对UART0的初始化设置。

其次设置向串口发送字节数据。使用发送保持寄存器U0THR、线状态寄存器U0LSR控制数据发送，在定义好要显示的数据后，运用while-if循环语句控制数据的发送。

-2. UART program design and circuit simulation using UART1 to output the character " An ARM7 Example LPC2138 By IMU 2011-04-20 23:55:07"　First, initialize the serial port 0 on request, using PINSEL0 register setting the UART0 initialize interfaces P0.0, P0.1. Use U0LCR set the baud rate, data length is defined as 8 data bits, through Fpclk operations, use U0DLM register setting divider register high byte register settings using U0DLL divider register low byte. Controller settings using the control register U0CLR communication mode, the completion of the initialization settings for UART0. Second byte of data to the serial port settings. Using Transmit Holding Register U0THR, line status register U0LSR control data sent in the definition of good data to be displayed, the use of while-if loop control data sent.