8051 Development Board Generic Board

8051 Generic Board is my fist project board in 8051 microcontroller course. This board is design for atmel 89c51 ic, please refer to its datasheet for more information.

Now come towards board description:

There are four i/o ports in 89c51, this board is design in such a manner that all ports are byte addressable whare as port3 can also be access bit wise in other world port 3 is also bit addressable. This can be done by proper selecting the jumper j2 and j5 and etc.Note that there are 8 jumpers at port 3 and also 8 jumpers at the u4 & u5 o/p pins are required, whereas in schematic only four are shown.

74ls245 latches are used to decide the direction of data. Switch SW1 is used to select the direction. If SW1 is towards vcc than the data direction is from 89c51 to latch o/p pins. And if SW1 is towards gnd than the direction is from latch to 89c51. For more info please refer to its datasheet.

LED bargraph are used to indicate the status of 89c51 port pins; that is data in or out.

Connectors J1, J4 and etc are used so that we can interface this board with other boards.

Note that only port 0 and port 3 connections are shown in schematic; port 1 and port 2 connection are the same as of port 0, but in that case RP1 is not required. As port 0 needs to be pull up so, resistor pack, RP1, is only required for this port.

Downloads:8051 Generic Board Files

Schematic:

Final Assembly:

Component Layout:

Components Required (according to layout):

R1, 10kΩ Resistor

R2, 100Ω Resistor

IC1, 89c51

IC2-IC6, 74ls245

Xtal, 11.0592Mhz

C1,C2, 33pF Ceramic Capacitor

C3, 16uF/25v Electrolyte Capacitor

PB, Push Button

Pwr, 2-way connector

J1-J11, 3-way jumper

J12-J15, 8-way connector

RB1, 10K ohm resistor bank 9 pins

PB2-PB5, 330 ohm resistor bank 9 pins

LED bargraph 4 pics

Zero ohm resistor 2 pics

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