The Microchip PIC16F877A has 40 pins 33 of them can be input or output. In this simple project I am going to configure this microcontroller to blink a 33 LED each LED is connected to one I/O pin.
The PIC16F877A has 8 analog channels, so we have to configure all these channels as digital output.
The pin RA4 is an open drain output we must add a pull up resistor to turn it on and off.
The circuit schematic is shown by the following picture:
The code is written using MikroC PRO for PIC compiler:
void main(){ ADCON1 = 0x07; // Configure all analoge pins as digital PORTA = 0; TRISA = 0; // Configure PORTA as output PORTB = 0; TRISB = 0; // Configure PORTB as output PORTC = 0; TRISC = 0; // Configure PORTC as output PORTD = 0; TRISD = 0; // Configure PORTD as output PORTE = 0; TRISE = 0; // Configure PORTE as output while (1) { PORTA = ~ PORTA; // Invert PORTA status PORTB = ~ PORTB; // Invert PORTB status PORTC = ~ PORTC; // Invert PORTC status PORTD = ~ PORTD; // Invert PORTD status PORTE = ~ PORTE; // Invert PORTE status delay_ms(500); } } For more detail: PIC16F877A LED blink
