User`s manual

6.4.Serial port
The microcontroller programming serial port (SCI4) is connected to the E8 connector. This serial port can optionally be connected to the
RS232 transceiver by moving option resistors and fitting the D connector in position J9. The connections to be moved are listed in the
following table.
Description Function Fit For E8 Remove for E8 Fit for RS232 Remove for
RS232
SCI4 Tx Programming Serial Port R15 R14 R14 R15
SCI4 Rx Programming Serial Port R12 R13 R13 R12
SCI4 Clk Programming Serial Port R10 NA NA NA
Table 6-3 - Serial Option Links
The board is designed to accept a straight through RS232 cable. A secondary microcontroller serial port is available and connected to the
application headers. Please refer to the schematic diagram for more details on the available connections.
The serial baud rates supported by this CPU board are shown below. Note: these values are calculated from the frequency value of the
main oscillating source fitted by default on this CPU board.
6MHz x 4 = 24MHz Asynchronous Serial Baud Rate Evaluation
N 0 1 2 3
BRR Rate ERR BRR Rate ERR BRR Rate ERR BRR Rate ERR
110 106 110 -0.44
300 155 300 0.16 38 300 0.16
1200 155 1202 0.16 38 1202 0.16 9 1172 -2.34
2400 77 2404 0.16 19 2344 -2.34 4 2344 -2.34
4800 155 4808 0.16 38 4808 0.16 9 4688 -2.34 1 5859 22.07
9600 77 9615 0.16 19 9375 -2.34 4 9375 -2.34 0 11719 22.07
19200 38 19231 0.16 9 18750 -2.34 1 23438 22.07
38400 19 37500 -2.34 4 37500 -2.34 0 46875 22.07
57600 12 57692 0.16 2 62500 8.51
115200 6 107143 -6.99 1 93750 -18.62
230400 2 250000 8.51
250000 2 250000 0.00
375000 1 375000 0.00
750000 0 750000 0.00
Table 6-4 : BRR Settings
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