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D E M O 9 S 0 8 K B 1 2
N O V E M B E R
1 6 ,
2 0 0 9
U S E R G U I D E
Figure 5: COM Connections
MCU Port
PTB1/KBIP5/TXD/ADP5
PTB0/KBIP4/RXD/ADP4
COM Signal
TXD
RXD
I/O PORT
CONNECTOR
J1-5
J1-7
Virtual COM Port
The integrated USB-BDM provides a serial link from the target MCU to the host PC through the
host application. Refer to the P&E Multilink documentation for further details.
COM_SEL
The COM_SEL option header selects between the virtual serial port implemented through the
USB-BDM or the RS-232 PHY. Figure 6 below shows the shunt positions to select between
the two options.
Figure 6: COM_EN Option Header
COM_SEL
●
1 ●
●
●
●
●
Select on-board RS-232 transceiver and DB9 connector
COM_SEL
●
1 ●
●
●
●
●
Selects Virtual COM port through USB BDM circuit
COM Connector
A standard 9-pin Dsub connector provides external connections for the SCI port. The Dsub
shell is connected to board ground through a ferrite bead. The ferrite bead provides noise
isolation on the RS-232 connection. Figure 7 below, shows the pin-out of the DB9 connector.
Figure 7: COM Connector
4, 6
TXD
RXD
1
2
3
6
7
8
1, 4
RTS
CTS
Female DB9 connector that interfaces to the HC(S)08 internal SCI1 serial
port via the U2 RS232 transceiver. It provides simple 2-wire
asynchronous serial communications without flow control. Flow control is
provided at test points on the board.
Pins 1, 4, and 6 are connected together.
1, 6
4
GND
5
9
NC
11
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