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2.2 RS-232 Serial Communications
The DSP56F801EVM provides an RS-232 interface by the use of an RS-232 level
converter, (Maxim MAX3245EEAI, designated as U2). Refer to the RS-232 schematic
diagram in
Figure
2-1. 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 P4. Flow control is not provided, but could be implemented using uncommitted
GPIO signals. The pinout of connector P4 is listed in
converter/transceiver can be disabled by placing a jumper at JG6.
Jumper Removed:
Enable RS-232
Jumper Pin 1-2:
Disable RS-232
Figure 2-1. Block Diagram of the RS-232 Interface
.
Table 2-1. RS-232 Serial Connector Description
2-4
DSP56F801
TXDO
RXDO
+3.3V
JG6
1
2
Pin #
Signal
1
Jumper to 6 & 4
2
TXD
3
RXD
4
Jumper to 1 & 6
5
GND
DSP56F801EVM Hardware User's Manual
Table
2-1. The RS-232 level
RS-232
Level Converter
Interface
T1in
T1out
R1out
R1in
FORCEOFF
P4
Pin #
Signal
6
Jumper to 1 & 4
7
Jumper to 8
8
Jumper to 7
9
N/C
1
6
2
7
3
8
4
9
x
5
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