PROGRAMMABLE INTEGRATED CIRCUIT - PIC 16F877A

PIC 16F877A and Description Pin Diagram

            OSC1 and OSC2 pins are connected to 20MHz crystal to execute every single program line in the system.  20MHz crystal is used because this is the maximum frequency that the PIC can support. If over frequency the PIC will burn. Else if crystal speed less than 20MHz then PIC response speed will slower.The MCLR pin of the PIC is pull up to 5V through a 10KR resistor

The PIC can operate using 4.5V to 6.0V DC voltage. In the project is operating at 5.0V (by using 7805). It is DIP layout (dual in line package) and suitable for student project. It has 40 pins but only 33 I/O pins can be set as digital input or digital output. The digital output of the PIC is 5V (for signal 1) and 0V (for signal 0) these signals will be directly connected to actuators for control purpose. When the PIC pin is set as digital input. It will detect input voltage 5V as signal 1 and 0V as signal 0. Any voltage less than 0V or more than 5V will damage PIC.

Differentiations Types of PIC


NOTE: http://courses.engr.illinois.edu/ece395/docs/PIC16F87X%20datasheet%2030292c.pdf