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2.4 RS-232 Serial Communications
The 56F826EVM provides an RS-232 interface by the use of an RS-232 level converter,
(Maxim MAX3245EEAI, designated as U3). Refer to the RS-232 schematic diagram in
2-3. The RS-232 level converter transitions the SCI UART's +3.3V signal levels
Figure
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
can be disabled by placing a jumper at JG2.
Jumper Removed:
Enable RS-232
Jumper Pin 1-2:
Disable RS-232
Figure 2-3. Schematic Diagram of the RS-232 Interface
.
Table 2-2. RS-232 Serial Connector Description
MOTOROLA
Freescale Semiconductor, Inc.
Table
56F826
T1in
TXDO
RXDO
R1out
+3.3V
FORCEOFF
JG2
1
2
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
2-2. The RS-232 level converter/transceiver
RS-232
Level Converter
Interface
T1out
R1in
x
P3
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
2-5
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