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56F800 датащи(PDF) 21 Page - Freescale Semiconductor, Inc

номер детали 56F800
подробное описание детали  16-bit Digital Signal Controllers
PDF  56 Pages
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производитель  FREESCALE [Freescale Semiconductor, Inc]
домашняя страница  http://www.freescale.com
Logo FREESCALE - Freescale Semiconductor, Inc

56F800 датащи(HTML) 21 Page - Freescale Semiconductor, Inc

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



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