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MPC566EVB User’s Manual
Communication Ports
3.
RS232 translators available to COM3 and COM4 that are not required by user application
may be applied to other COM ports by isolating the MPC566 SCI signals to the RS232
transceiver and applying the associated RS232 level input or output to another COM port.
User should refer to the schematic diagrams of the board to make sure correct signals and
connections are isolated and reconnected for the new application.
JP1 – COM2 DCE/DTE Option:
1
COM-2 is optioned as a DCE type RS232 connection by default (same as COM-1). This allows
direct connection to a standard 9 pin PC COM serial port.
1
COM-2 DTE option. This requires a NULL modem adapter to connect to a standard 9 pin PC
COM serial port.
AT1/2, AR1/2, BT1/2, BR1/2 - Serial Port Configuration
The Axx and Bxx cut-away options provide a means of isolating the individual SCI RXD and TXD
signals from the RS232 interface translator device (U10) and COM port operation. This allows the
SCI channels to be used for other purposes, possibly on the QSM port connector. Following is a
table of the SCI signals and AT/R_ positions used for enabling RS232 and COM port operation.
Note: 2mm header maybe installed after cutaways are cut to allow jumper option.
Table 1-4. Serial Port Configuration
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AT_ Position
SCI Channel
Signal
RS232 COM Port
Connection
COM_PORT Signal
Direction to RS232
interface translator
AT1
SCI_A_ TXD1
COM-1
Output
AR1
SCI_A_ RXD1
COM-1
Input
AT2
SCI_A_ TXD2
COM-2
Output
AR2
SCI_A_ RXD2
COM-2
Input
BT1
SCI_B_ TXD1
COM-3
Output
BR1
SCI_B_ RXD1
COM-3
Input
BT2
SCI_B_ TXD2
COM-4
Output
BR2
SCI_B_ RXD2
COM-4
Input
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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