Development Board for PIC16F877/16F874

The circuit of development board was designed to support and test PIC microcontrollers such as 16F877 and 16F874 to interface with one of many programmers allowing the microcontrollers not to be removed from the board.

An LCD is used to connect the development board which could be well visible using the row of LEDs to check the logic state of up to 8 I/O ports and allow the PIC to be interfaced with external circuit. One of the main characteristics of this circuit is the clock generated by RC net or by crystal wherein the clock frequency can be varied with a trimmer in RC mode while using different crystals in the XT and HS modes.

The 8 LEDs are being driven by octal CMOS buffer wherein the I/O pins of PIC or any external circuits can be connected to the buffer’s inputs. Double connectors were used both for plug and for wires to connect all the microcontroller’s pins. The LVP mode is selected via DIP switch while the selection of working modes are through 4 or 6-ways DIP switches.

The supply of the circuit comes from a 5V source from the onboard regulator.

Rest of the project