This is PIC Microcontroller 1st tutorial and in this tutorial we are going to learn, how to interface I/O Ports with PIC Microcontroller. PIC(18F4550) Microcontroller has 5 I/O Ports(A,B,C,D,E) those can work both as Input and Output. To program PIC Microcontroller in C you need MPLAB IDE which can easily be downloaded from Microchip’s site.
- To make any Port I/O you need to remember one keyword which is TRISX (X is Port Name you are using). Now if you write TRISB=1 this will make Port B as Input and writing TRISB=0 make Port B as Output.
- Lets see a program in which Microcontroller gets Input from Port B and display Output at Port A. The program begin by writing #include
where p18f4550.h is the header file you need to attach with your Project. Click here to see how to attach files in MPLAB IDE.
#includeHeader File attached to Project
void main()
{
TRISB=1; Make Port B as Input
TRISA=0; Make Port A as Output
while(1) Super loop
{
PORTA=PORTB; Copy Data at Port B to Port A
}
} - while(1) { …….} is called the Super loop and is used when you are using file for hardware.
- This program will continuously copy data from Port B to Port A. If you need to See the Program working in your computer you can download PIC Simulator IDE and watch your program working.
- Keep trying these type of Programs. Enjoy…
Posted in: 
