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2.4 RS-232 Serial Communications
The 56F827EVM 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
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 P3. Flow control is not provided,
but could be implemented using uncommitted GPIO signals. The pinout of connector P3 is listed
in
2-2. The RS-232 level converter/transceiver can be disabled by placing a jumper at JG2.
Table
Figure 2-3. Schematic Diagram of the RS-232 Interface
Freescale Semiconductor
56F827
TXDO
RXDO
+3.3V
Jumper Removed:
JG2
Enable RS-232
1
2
Jumper Pin 1-2:
Disable RS-232
Table 2-2. RS-232 Serial Connector Description
Pin #
Signal
1
Jumper to 6 & 4
2
TXD
3
RXD
4
Jumper to 1 & 6
5
GND
Technical Summary, Rev. 2
RS-232
Level Converter
Interface
T1in
T1out
R1out
R1in
FORCEOFF
P3
Pin #
Signal
6
Jumper to 1 & 4
7
Jumper to 8
8
Jumper to 7
9
N/C
RS-232 Serial Communications
2-3. The
Figure
P3
1
6
2
7
3
8
4
9
x
5
2-5
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