T W R - 9 S 1 2 G 1 2 8
J U N E 2 , 2 0 1 0
U S E R G U I D E
11
COM Connectcor
A
2x5, 0.1”, standard “Berg” pin-header provides external connections for the SCI port. Figure
5 below shows the COM1 pin-out.
Figure 5: COM1 Connector
2, 7
1
2
1, 7
TXD
3
4
CTS
RXD
5
6
RTS
1, 2
7
8
TP2
GND
9
10 NC
COM_EN
The COM_EN option header connects the MCU SCI port to either the SCI PHY or the LIN
PHY. Figure 6 below shows the option jumper configuration for the COM_EN option header.
Figure 6: COM_EN Option Header
2 4 6 Connects target MCU SCI port to LIN PHY to enable LIN bus
communications
1 3 5
COM_EN
2 4 6 Connects target MCU SCI port to RS-232 PHY to enable serial
communications
1 3 5
COM_EN
LIN Port
The TWR-S12G128 applies the MC33661 LIN bus physical layer device (transceiver) to
support LIN communications. The PHY may be configured as a Master or Slave node on the
LIN bus. LIN connectors J9 & J10 are configured in parallel to support pass-thru signaling.
Figure 7 shows the LIN block diagram.
Figure 7: LIN Block Diagram
MC33661
LIN PHY
J6 / J7
JP3
MSTR
(partial)
JP3
LIN_PWR
(partial)
CT6
MC9S12G128
RXD0
TXD0
COM_EN
(partial)
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