Rs-232 Serial Communications; Schematic Diagram Of The Rs-232 Interface - Motorola 56F8346 User Manual

2.4 RS-232 Serial Communications

The 56F8346EVM provides an RS-232 interface by the use of an RS-232 level converter,
Maxim MAX3245EEAI, designated as U4. Refer to the RS-232 schematic diagram in
Figure 2-4. 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.
The SCI0 port signals can be isolated from the RS-232 level converter by removing the
jumpers in JG12, reference
The RS-232 level converter/transceiver can be disabled by placing a jumper at JG7.
56F8346
TXD0
RXD0
Jumper Removed:
Enable RS-232
Jumper Pin 1-2:
Disable RS-232
Figure 2-4. Schematic Diagram of the RS-232 Interface
.
MOTOROLA
Freescale Semiconductor, Inc.
Table 2-1. The pinout of connector P2 is listed in
Level Converter
JG12
T1in
1 2
3 4
R1out
+3.3V
FORCEOFF
JG7
1
2
Table 2-1. SPI0 Jumper Options
JG12
Pin # Signal
1 TXD0
3 RXD0
Technical Summary
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RS-232 Serial Communications
RS-232
Interface
1
6
T1out 2
7
3
R1in
8
4
9
x
5
Pin # Signal
2 RS-232 TXD
4 RS-232 RXD
Table 2-3.
P2
2-7