MIKROE-798 mikroElektronika, MIKROE-798 Datasheet - Page 16

• Manufacturer Part Number: MIKROE-798
• Description: Development Boards & Kits - PIC / DSPIC EASYPIC v7 DEVELOPMENT SYSTEM
• Manufacturer: mikroElektronika

Specifications of MIKROE-798

• Rohs: yes
• Product: Development Boards
• Tool Is For Evaluation Of: PIC18F45K22
• Core: PIC
• Interface Type: RS-232, USB
• Operating Supply Voltage: 5 V
• Description/function: Development board only, touch screen, pencil, DS1820, LCD, serial cable, GLCD not included
• Dimensions: 266 mm x 220 mm

UART via RS-232
page 16
In
communication, you must set J3
and J4 jumpers in the RS-232
position, and enable desired RX
and TX lines via SW1 and SW2
DIP switches. For example, if you
want to enable RS-232 connection
on UART1 module of the default
PIC18F45K22 chip, you should
enable SW1.1 (RC7) and SW2.1
(RC6) lines.
Enabling RS-232
order
to
TX-232
RX-232
RX-232
RX-FTDI
TX-232
TX-FTDI
DATA BUS
enable
J3
J4
RX
TX
RS-232
SW1
SW2
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.
RC7
RB2
RB1
RB4
RA3
RB5
RC5
RD7
RC6
RB5
RB2
RB1
RA2
RB7
RC4
RD6
UART
levels
(universal
100nF
are
C28
100nF
C30
C31
100nF
different
1
2
3
4
5
6
7
8
C29
100nF
asynchronous
U4
MAX3232
C1+
V+
C1-
C2+
C2-
V-
T2OUT
R2IN
than
VCC-MCU
T1OUT
R1OUT
R2OUT
R1IN
T1IN
T2IN
GND
R32
100K
VCC
VCC-MCU
16
15
14
13
12
11
10
9
VCC-MCU
Figure 6-1: RS-232 connection schematic
E8
10uF
1
6
2
7
3
8
4
9
5
CN37
RS232