MIKROE-11 mikroElektronika, MIKROE-11 Datasheet - Page 24

• Manufacturer Part Number: MIKROE-11
• Description: Development Boards & Kits - AVR BIGAVR2 DEVELOPMENT SYSTEM
• Manufacturer: mikroElektronika

Specifications of MIKROE-11

• Rohs: yes
• Product: Development Kits
• Tool Is For Evaluation Of: ATMEGA128
• Core: AVR8
• Interface Type: IDC10, JTAG, RS-232, USB
• Operating Supply Voltage: 5 V
• Data Bus Width: 8 bit
• For Use With: ATmega, AT90

RS-232 COMMUNICATION
24
RS-232 communication enables point-to-point data transfer. It is commonly used in data
acquisition applications to transfer data between the microcontroller and PC. Since the volt-
age levels of the microcontroller and PC are not directly compatible with those of RS-232, a
level transition buffer, such as MAX232, must be used.
Figure 31
RS232 connector
In order to provide even more flexible system, the microcontroller is connected to two
MAX232 chips through switches of the SW3. First two switches (1 and 2) are used to con-
nect MCU pins PE0 and PE1 to the RS232-A port via Rx and Tx lines, respectively. Other two
switches (5 and 6) are used to connect MCU pins PD2 and PD3 to the RS232-B port through
Rx and Tx lines, respectively. Both RS232 ports have RTS and CTS lines (3 and 4 on RS232-
A and 7 and 8 on RS232-B) for implementing hardware handshaking.