Rs-232 Serial Communications; Schematic Diagram Of The Rs-232 Interface; Flow Control Header Options - Motorola 56F8323 User Manual

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
2-1. 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 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
can be isolated from the RS-232 level converter by removing the jumpers in JG5;
reference Table 2-2. The pin-out of connector P2 is detailed in
level converter/transceiver can be disabled by placing a jumper at JG4.
56F8323
TXD1
RXD1
Jumper Removed:
Enable RS-232
Jumper Pin 1-2:
Disable RS-232
Figure 2-1. Schematic Diagram of the RS-232 Interface
.
2-4
Freescale Semiconductor, Inc.
Level Converter
JG5
T1in
1 2
3 4
R1out
JG13
T2in
RTS
1
CTS
2
R2out
+3.3V
FORCEOFF
JG4
1
2
Table 2-1. Flow Control Header Options
JG13
Pin #
1 RTS to Transceiver
2 CTS from Transceiver
56F8323EVM User Manual
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Table 2-1. The SCI1 port signals
Table
RS-232
Interface
T1out
R1in
R2in
T2out
x
Signal
2-3. The RS-232
P2
1
6
2
7
3
8
4
9
5
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