4-1
Rev. 1.0
2018-09-25
User Manual
TLE985x Evaluation Board
Communication Interfaces
4
Communication Interfaces
4.1
LIN and uIO for LIN BSL
The device-integrated LIN transceiver is connected to a banana jack and additionally to the uIO BSL interface. To
integrate the device in a LIN network it is sufficient to use the single wire banana interface. The BSL interface is
intended to program the device via LIN. For further information about the uIO interface see
www.hitex.com/uio
.
4.2
UART (virtual COM port via USB)
A virtual COM port provided by the Segger driver enables a PC-to-board communication via UART. The UART2
module of TLE985x uses the pins P1.0 (transmit) and P1.1 (receive). Those are connected to the XMC4200, which
emulates Rx and Tx on PC side with the Segger firmware. Although they can be disconnected physically,
bidirectional level shifters ensure that the XMC pins are hi-Z in the case the virtual COM port is not used. By
connecting the evaluation board to the PC a virtual COM port gets emulated by the Segger driver automatically.
The port will show up in the Microsoft® Windows® device manager.
Figure 5
UART and Debugging
Note:
Only one of the interfaces USB or SWD can be used at one time. While using the SWD interface the XMC
is hold in reset. It therefore eliminates debugging or UART via USB while a debugger is connected with
the SWD interface.
4.3
SWD debug interface (J-Link via USB)
For serial wire debug (SWD) the TLE985x uses the pins TMS (data) and P0.0 (clock). Level shifters between
XMC4200 and TLE985x allow using P0.0, while it is not used for debugging.
The Segger J-Link module on board allows serial wire debugging via USB.
It is also possible to use an alternative debugger instead of the on-board Segger debugger, e.g. Keil ULINK2. For
this the signals are routed through the 10 pin header SWD interface between the XMC4200 and the TLE985x. The
pin configuration makes sure that the XMC is hold in reset while another debugger is physically connected at X15.
The virtual COM port will be disabled, while the external ISP is connected.
