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2.4 RS-232 Serial Communications
The DSP56852EVM provides an RS-232 interface by the use of an RS-232 level
converter, (Maxim MAX3245EEAI, designated as U6). Refer to the RS-232 schematic
diagram in
Figure
2-4. The RS-232 level converter transitions the SCI UART's +3.3V
signal levels to RS-232-compatible signal levels and connects to the host's serial port via
connector P6. Flow control is not provided, but could be implemented using uncommitted
GPIO signals. The pinout of connector P6 is listed in
converter/transceiver can be disabled by placing a jumper at JG8.
DSP56852
Jumper Removed:
Enable RS-232
Jumper Pin 1-2:
Disable RS-232
Figure 2-4. Schematic Diagram of the RS-232 Interface
.
Table 2-2. RS-232 Serial Connector Description
2-6
Freescale Semiconductor, Inc.
Level Converter
TXD
T1in
RXD
R1out
+3.3V
FORCEOFF
JG8
1
2
P6
Pin #
Signal
1
Jumper to 6 & 4
2
TXD
3
RXD
4
Jumper to 1 & 6
5
GND
DSP56852EVM User's Manual
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Table
2-2. The RS-232 level
RS-232
Interface
1
6
2
T1out
7
3
R1in
8
4
9
x
5
Pin #
Signal
6
Jumper to 1 & 4
7
Jumper to 8
8
Jumper to 7
9
N/C
P6
MOTOROLA
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