The list of supported baud rates is:

110, 300, 600, 1200, 2400, 4800, 9600, 14400, 19200, 38400, 57600, 115200, 230400, 460800, 921600

(from [[http://mbed.org/forum/mbed/topic/893/?page=1#comment-4520|this forum post)

That was a very useful post for me to make the best use of hardware.

Tested and verified the highest rates on both USB and defined PINS.

Serial pc(USBTX, USBRX);     // tx, rx   for debug with PC and terminal SW
Serial pc_13(p13, p14);      // tx, rx   for debug with USBee and async connection

Be sure to visit the main handbook page sections:

• Debugging - A guide to help find and solve errors and bugs in your programs
• SerialPC - Communicate between an mbed Microcontroller and a PC
• Windows serial configuration - Windows serial driver installation
• Terminals - Guide to using terminal applications
• Breadboard - A guide to breadboards

Changes can be made by defining and using the library methods with the object dot method syntax.

// ASYNC Serial Port Details **********************************************************
int baudrate = 921600;       // limited to 921600 baud, the highest rate, full list at mbed.org

pc_13.baud(baudrate);       // capture with USBee pod
pc.baud(baudrate);          // used with "Tera Term" free terminal text window