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Serial
Interfaces
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PHYTEC Messtechnik GmbH 2006 L-678e_0
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7
Serial Interfaces
7.1
RS-232 Interface
A dual-channel RS-232 transceiver is located on the
phyCORE-MPC5200B tiny at U3. This device adjusts the signal
levels of the UART3_RXD/TXD_TTL and UART6_RXD/TXD_TTL
lines (MPC5200B PSC3/PSC6). The
RS-232 interface enables connection of the module to a COM port on
a host-PC or other peripheral devices. In this instance, the RXD3-232
or RXD6-232 line (X1D22/X1C21) of the transceiver is connected to
the corresponding TXD line of the COM port; while the TXD3-232 or
TXD6-232 line (X1D23/X1C23) is connected to the RXD line of the
COM port. The Ground circuitry of the phyCORE-MPC5200B tiny
must also be connected to the applicable Ground pin on the COM port.
The processor's on-chip UART supports handshake signal
communication. Use of an RS-232 signal level in support of
handshake communication requires use of an external
RS-232 transceiver not located on the module.
Furthermore it is possible to use the TTL signals of both of the UART
channels externally. These signals are available at X1D16, X1D17
(UART3_RXD_TTL, UART3_TXD_TTL) and X1C19, X1C20
(UART6_RXD_TTL, UART6_TXD_TTL) on the phyCORE-
connector. External connection of TTL signals is required for galvanic
separation of the interface signals. Using solder jumpers J1 and J2, the
TTL transceiver outputs of the on-board RS-232 transceiver devices
can be disconnected from the receive lines UART3_RXD_TTL and
UART6_RXD_TTL. This is required so that the external transceiver
does not drive signals against the on-board transceiver. The transmit
lines UART3_TXD_TTL / UART6_TXD_TTL can be connected
parallel to the transceiver input without causing any signal conflicts.
Содержание phyCORE-MPC5200B tiny
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Страница 104: ...Published by PHYTEC Messtechnik GmbH 2006 Order No L 678e_1 Printed in Germany...