MIKROE-455 mikroElektronika, MIKROE-455 Datasheet - Page 11

• Manufacturer Part Number: MIKROE-455
• Description: Development Boards & Kits - 8051 EASY8051 V6 DEVELOPMENT SYSTEM
• Manufacturer: mikroElektronika

Specifications of MIKROE-455

• Rohs: yes
• Product: Development Kits
• Tool Is For Evaluation Of: AT89S8253
• Core: 8051
• Interface Type: CAN, MMC/SD, RS-232, USB
• Operating Supply Voltage: 5 V, 9 V to 32 V
• Data Bus Width: 8 bit
• Description/function: Development Board Only, GLCD, LCD, DS1820, Serial Cable not included
• Dimensions: 265 mm x 220 mm
• Maximum Operating Temperature: + 125 C
• Minimum Operating Temperature: - 55 C
• For Use With: AT89S8253

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Easy8051 v6 Development System
6.0. RS-232 Communication Interface
The USART (universal synchronous/asynchronous receiver/transmitter) is one of the most common ways of exchanging data
between the PC and peripheral components. RS-232 serial communication is performed through a 9-pin SUB-D connector and the
microcontroller USART module. The Easy8051 v6 development system provides one RS-232 port which is enabled by setting swiches
5 and 6 on the DIP switch SW8 to the ON position. The microcontroller pins used in such communication are marked as follows: RX
- receive data and TX - transmit data. Baud rate goes up to 115 kbps.
In order to enable the microcontroller’s USART module to receive input signals with different voltage levels, it is necessary to provide
a voltage level converter such as MAX202C (MAX232).
RS-232 connector
Figure 6-1: RS-232 module
Switches 5 and 6 on the DIP switch SW8 are used to interface the RS-232 module to the microcontroller via RX and TX lines, as
shown in Figure 6-2.
Port RS-232 is connected to the microcontroller
Figure 6-2: RS-232 module schematic
Make sure that your microcontroller is provided with the USART module as it is not necessarily integrated in all PIC microcontrollers.
MikroElektronika