Phytec phyCORE-167CR, Hardware Manual

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phyCORE-167CR/167CS
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PHYTEC Meßtechnik GmbH 2002 L-527e_8
3.14 J21, J22 Serial Interface
Jumper J21 and J22 connect the signals of the first asynchronous
serial interface to the on-board RS-232 transceiver (U6). The interface
signals are then available with RS-232 level at the
phyCORE-connector pins X1D22 (RxD0) and X1D23 (TxD0). If the
jumpers are opened, the applicable controller pins P3.10 and P3.11
can be used with their alternative functions or the serial interface
signals are available with their TTL level at phyCORE-connector
pins X1D17 and X1D16.
Note:
These jumpers must remain closed on the phyCORE-167CR/167CS.
If they are open, no serial communication is possible, hence PHYTEC
FlashTools or the BOOT monitor will not function properly.
If the jumpers are closed we recommend not to use the interface
signals with their TTL level as this will cause damage to the on-board
components.
Signal Quality J21 J22
TxD0 and RxD0 carry RS-232 level closed* closed*
P3.10 and P3.11 available as I/O pin
or TxD0 and RxD0 interface signals
with TTL level
open open
* = Default setting
Table 16: J21, J22 First Serial Interface Configuration