rtd cpuModules CME34BT, User Manual, Page: 66 / 110

58 CME34BT cpuModule BDM-610000088 Rev A
Non-Standard Serial Port Modes
It is possible to change the input clock rate for the UARTs of the cpuModule to allow the serial ports to
operate at higher speeds than 115,200 bps. This is accomplished by modifying the baud rate multiplier for
each serial port.
Non-standard baud rates are supported for all COM port modes of the CME34BT. :
To set an alternate maximum baud rate for a serial port, write the value which corresponds to the desired
multiplier to the port’s baud rate multiplier register:
Table 30 Baud Rate Multiplier Registers
Connector Port Address Range
(hex)
CN7 (A) COM 1 EE0–EE1h
CN7 (B) COM 3 EE2–EE3h
CN8 (A) COM 2 EE4–EE5h
CN8 (B) COM 4 EE6–EE7h
Table 31 Baud Rade Multipliers
Value Maximum Baud Rate
bps Multiplier
0x0E28 115,200 1x
0x38A0 460,800 4x
0x713F 921,600 8x
0x7AE1 1,000,000 8.7x
Note When using the non-standard high speed serial port modes, it is highly recommended
to use hardware flow control, whenever possible.