C8051F410串口通信程序。。上位机发送一个字符，下位机把这个字符再发回，并再以十六进制再发一次。-Program Descr iption:

This program demonstrates how to configure the C8051F410 to use routines

in STDIO.h to write to and read from the UART interface.　The program

reads a character using the STDIO routine getkey(), outputs that character

to the screen, and then outputs the ASCII hex value of that character.