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2.3 RS-232 Serial Communications
The 56F805EVM provides an RS-232 interface by the use of an RS-232 level converter,
(Analog Devices ADM3311EARS, designated as U16); refer to the RS-232 schematic
diagram in
2-2. The RS-232 level converter transitions the SCI UART's +3.3V
Figure
signal levels to RS-232 compatible signal levels and connects to the host's serial port via
connector P3. Flow control is not provided, but could be implemented using uncommitted
GPIO signals. The pinout of connector P3 is listed in
converter/transceiver can be disabled by removing the jumper at JG9.
Figure 2-2. Schematic Diagram of the RS-232 Interface
.
Table 2-1. RS-232 Serial Connector Description
MOTOROLA
Freescale Semiconductor, Inc.
56F805
TXD0
T1in
RXD0
R1out
P3
Pin #
Signal
1
Jumper to 6 & 4
2
TXD
3
RXD
4
Jumper to 1 & 6
5
GND
Technical Summary
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RS-232 Serial Communications
Table
2-1. The RS-232 level
RS-232
Level Interface
T1out
R1in
x
RS-232
Pin #
Signal
6
Jumper to 1 & 4
7
Jumper to 8
8
Jumper to 7
9
N/C
P3
1
6
2
7
3
8
4
9
5
DB9
2-5
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