Introduction
There are some 89SXX development boards, here is another one. I have designed this single side development board to be used as a tool for learning MCS-51 Microcontrollers, and for easy microcontroller project development.
The 89SXX development features :
- 89SXX 40-DIL based design, 89S51/52/53.
- In System Programmable (ISP) through the 6-pin header.
- RS-232 and RS-485 serial port (shared pin) for communicating with serial devices like PC.
- HD44780 compatible alphanumeric LCD connectivity with backlight control.
- 4 on-board tact switch.
- 16 general purpose IO port pins on 5x2 header (Port0 and Port2).
- 24CXX I2C EEPROM.
- DS1302 serial Real Time Clock (RTC) with battery backup.
- On-board supply rectifier and voltage regulator.
- Single sided PCB design.
Hardware
Front side
Back side
The hardware block is shown in fig.1. The MCU is 89SXX microcontroller. And the complete hardware schematic is shown in fig.2.
- Port1 is used as data=bus for LCD (4-bit interface, PCB layout for 16x2 character with backlight.), on=board tat switch and connection for In System Programming (ISP).
- Port0 and Port2 as general purpose IO, are available for interfacing external devices. Port0 is connected to DIP switch, and also P0.0 and P0.1 are connected with opto-isolated input.
- Port3, P3.0 and P3.1 are being used for serial communication UART, P3.2 for RS-485 control direction. P3.3 and P3.4 are serving as general purpose IO port pins. Another pins for communicating with serial chip, EEPROM, RTC and serial shift register (LED array indicator).
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