Rs-232 Serial Communications; Schematic Diagram Of The Rs-232 Interface; Rs-232 Serial Connector Description - Motorola DSP56F803 Hardware User Manual

2.3 RS-232 Serial Communications

The DSP56F803EVM provides an RS-232 interface by the use of an RS-232 level
converter, (Analog Devices ADM3311EARS, designated as U3); refer to the RS-232
schematic diagram in
+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
Figure 2-2. Schematic Diagram of the RS-232 Interface
.
Table 2-1. RS-232 Serial Connector Description
Figure 2-2. The RS-232 level converter transitions the SCI UART's
DSP56F803
TXD0
RXD0
Pin # Signal
1 Jumper to 6 & 4
2 TXD
3 RXD
4 Jumper to 1 & 6
5 GND
Technical Summary
RS-232 Serial Communications
RS-232
Level Interface
RS-232
T1in T1out
R1out R1in
P4
Pin # Signal
6 Jumper to 1 & 4
7 Jumper to 8
8 Jumper to 7
9 N/C
Table 2-1.
DB9
1
6
2
7
3
8
4
9
x
5
P4
2-5