Distributor of NXP Semiconductors: Excellent Integrated System Limited
Datasheet of DSP56F803EVM - KIT EVALUATION FOR DSP56F803
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RS-232 Serial Communications
Technical Summary, Rev. 5
Freescale Semiconductor
2-5
2.3 RS-232 Serial Communications
The 56F803EVM 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
Figure 2-2
. 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 pin-out of connector P4 is listed in
Table 2-1
.
Figure 2-2. Schematic Diagram of the RS-232 Interface
Table 2-1. RS-232 Serial Connector Description
P4
Pin #
Signal
Pin #
Signal
1
Jumper to 6 & 4
6
Jumper to 1 & 4
2
TXD
7
Jumper to 8
3
RXD
8
Jumper to 7
4
Jumper to 1 & 6
9
N/C
5
GND
56F803
RS-232
Level Interface
RXD0
R1in
T1out
T1in
R1out
6
3
2
7
8
4
5
x
1
9
TXD0
RS-232 DB9
P4
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