Datasheet

page 29
UART via USB
Modern PC computers, laptops and notebooks are
no longer equipped with RS-232 connectors and
UART controllers. They are nowadays replaced with
USB connectors and USB controllers. Still, certain technology
enables UART communication to be done via USB connection.
FT232RL from FTDI® convert UART signals to the appropriate
USB standard. In order to use USB-UART module on mikromedia
™
workStation v7 board, you must rst install FTDI drivers on
your computer. Drivers can be found on Product DVD:
USB-UART communication is being done through
a FT232RL controller, USB connector (CN21),
and microcontroller UART module. To establish this
connection, you must connect RX and TX lines to the
appropriate pins of the mikromedia
™
board. This
connection is done using DIP switches
SW4.6 and SW4.7.
15
16
17
18
19
20
21
22
23
24
25
26
27
281
2
3
4
5
6
7
8
9
10
11
12
13
14
VCC-3.3V
C8
100nF
C9
100nF
VCC-5VVCC-5VVCC-3.3V
TXD
DTR#
RTS#
VCCIO
RXD
RI#
GND
NC
DSR#
DCD#
CTS#
CBUS4
CBUS2
CBUS3
CBUS0
CBUS1
OSCO
OSCI
TEST
AGND
NC
GND
GND
VCC
RESET#
3V3OUT
USBDM
USBDP
FT232RL
U2
FT232RL
VCC-5V
C13
100nF
LD7 LD8
RX-LED1
TX-LED1
R20
4K7
R19
2K2
VCC-3.3V VCC-3.3V
R21
4K7
R23
10K
1
2
3
4
VCC
GND
D-
D+
CN21
USB B
E2
10uF
USB UART I
CONNECTOR
FTDI1-D_N
FTDI1-D_P
G4.4
G4.5
1 2 3 4 5 6 7 8
O
N
SW4
TX-FTDI
RX-FTDI
DATA BUS
Figure 9-1: UART via USB
connection schematic
Enabling USB-UART
DVD://download/eng/software/development-tools/
universal/ftdi/vcp_drivers.zip
In order to enable USB-UART
communication, you must push
SW4.6 (G4.4) and SW4.7 (G4.5)
to ON position. This connects the
RX and TX lines to appropriate
mikromedia
™
board UART module.
communication
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