MIKROE-1385 mikroElektronika, MIKROE-1385 Datasheet - Page 14

• Manufacturer Part Number: MIKROE-1385
• Description: Development Boards & Kits - AVR EASY AVR V7 DEVELOPMENT SYSTEM
• Manufacturer: mikroElektronika

Specifications of MIKROE-1385

• Rohs: yes
• Product: Development Boards
• Tool Is For Evaluation Of: ATMEGA32 Devices
• Core: AVR
• Interface Type: mikroBUS socket, RS-232, USB
• Operating Supply Voltage: 3.3 V, 5 V
• Data Bus Width: 8 bit
• Dimensions: 266 mm x 220 mm
• For Use With: MIKROE-240, MIKROE-55

UART via RS-232
page 14
Enabling RS-232
In order to enable RS-232
communication, you must set
J23 and J12 jumpers in the RS-
232 position, and enable desired
RX and TX lines via SW10 DIP
switch. For example, if you want
to enable RS-232 connection
on UART module of the default
ATmega32 chip, you should
enable
SW10.2 (RD1) lines.
SW10.1
TX-232
RX-232
RX-232
RX-FTDI
TX-232
TX-FTDI
DATA BUS
J23
J12
(RD0)
RX
TX
and
SW10
The
receiver/transmitter) is one of the most
common ways of exchanging data between
the MCU and peripheral components. It is
a serial protocol with separate transmit and
receive lines, and can be used for full-duplex
communication. Both sides must be initialized with
the same baud rate, otherwise the data will not be
received correctly.
RS-232 serial communication is performed through a
9-pin SUB-D connector and the microcontroller UART
module. In order to enable this communication, it
is necessary to establish a connection between
RX and TX lines on SUB-D connector and the
same pins on the target microcontroller using
DIP switches. Since RS-232 communication
voltage
microcontroller logic levels, it is
necessary to use a RS-232
Transceiver circuit, such as
MAX3232 as shown
on Figure 6-1.
PD0
PD1
PD2
PD3
UART
levels
(universal
are
C11
100nF
C20
100nF
C21
100nF
different
1
2
3
4
5
6
7
8
C22
100nF
asynchronous
U3
MAX3232
C1+
V+
C1-
C2+
C2-
V-
T2OUT
R2IN
C2-
V-
VCC-BRD
than
R35
100K
T1OUT
R1OUT
R2OUT
R1IN
GND
T1IN
T2IN
VCC
VCC-BRD
16
15
14
13
12
11
10
9
VCC-BRD
E2
10uF
Figure 6-1: RS-232 connection schematic
1
6
2
7
3
8
4
9
5
CN12
DB-9
EasyAVR
v7