MIKROE-1189 mikroElektronika, MIKROE-1189 Datasheet - Page 28

• Manufacturer Part Number: MIKROE-1189
• Description: Development Boards & Kits - PIC / DSPIC MIKROMEDIA FOR PIC WORKSTATION v7
• Manufacturer: mikroElektronika

Specifications of MIKROE-1189

• Rohs: yes
• Product: Development Systems
• Tool Is For Evaluation Of: PIC18FJ, dsPIC33, PIC24, PIC32
• Core: dsPIC, PIC
• Operating Supply Voltage: 3.3 V

UART via RS-232
page 28
In
communication you must push
SW3.6 (G4.4) and SW3.7 (G4.5)
to ON position. This connects the
RX and TX lines to appropriate
mikromedia
Enabling RS-232
order
Figure 8-1: UART via RS-232
connection schematic
™
to
board UART module.
DATA BUS
enable
RS-232
G4.4
G4.5
The
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 levels
are different than microcontroller logic
levels, it is necessary to use a RS-
232 Transceiver circuit, such as
MAX3232 as shown on
Figure 8-1.
UART
SW3
(universal
TX-232
RX-232
asynchronous
100nF
100nF
C10
C11
100nF
C7
1
2
3
4
5
6
7
8
C12
100nF
receiver/
U1
MAX3232
C1+
V+
C1-
C2+
C2-
V-
T2OUT
R2IN
VCC-3.3V
T1OUT
R1OUT
R2OUT
R22
100K
R1IN
T1IN
T2IN
VCC
GND
VCC-3.3V VCC-3.3V
16
15
14
13
12
11
10
9
E1
10uF
1
6
2
7
3
8
4
9
5
RS-232 CONNECTOR
CN19