User`s manual
High Performance Low Cost Embedded Systems
Serial Port
The S3C2440 has three serial ports: UART0, 1 and 2. UART0 can be used in conjunction with
UART1 as a full functioned serial port. In most applications, we only need very simple features of
these three serial ports,(the Linux and WinCE drivers that are shipped with our system are set this
way by default), i e. TXD and RXD. They correspond to CON1, CON2 and CON3 which are all TTL
levels. Among them UART0 is RS232 level converted, corresponds to COM0 and can communicate
with a PC.
CON1, CON2 and CON3’s positions are presented below
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