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56F8323EVM User Manual
MOTOROLA
2.2 RS-232 Serial Communications
The 56F8323EVM 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
. 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 P2.
Flow control is not provided, but could be implemented using uncommitted GPIO signals
and connected to the RTS and CTS signals on JG13; see
. The SCI1 port signals
can be isolated from the RS-232 level converter by removing the jumpers in JG5;
reference
. The pin-out of connector P2 is detailed in
. The RS-232
level converter/transceiver can be disabled by placing a jumper at JG4.
Figure 2-1. Schematic Diagram of the RS-232 Interface
.
Table 2-1. Flow Control Header Options
JG13
Pin #
Signal
1
RTS to Transceiver
2
CTS from Transceiver
56F8323
RS-232
Level Converter
Interface
TXD1
RXD1
R1in
T1out
T2in
R2out
FORCEOFF
JG4
6
3
2
7
8
4
5
x
1
9
+3.3V
Jumper Removed:
Enable RS-232
P2
JG13
1
2
1
2
Jumper Pin 1-2:
Disable RS-232
T1in
R1out
JG5
1
2
3
4
RTS
CTS
R2in
T2out
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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