maxEmbedded code DC motor control

#include <avr/io.h>
#include <util/delay.h>         // for _delay_ms()

int main(void)
{
    DDRC = 0x0F;            // initialize port C
                    // motors connected across PC0...Pc3
    while(1)
    {
    // clockwise rotation
    PORTC = 0b00000101;     // PC0 = High = Vcc
                    // PC1 = Low = 0
                    // PC2 = High = Vcc
                    // PC3 = Low = 0

    _delay_ms(500);         // wait 0.5s

    // counter-clockwise rotation
    PORTC = 0b00001010;     // PC0 = Low = 0
                    // PC1 = High = Vcc
                    // PC2 = Low = 0
                    // PC3 = High = Vcc

    _delay_ms(500);         // wait 0.5s
    }
}