unsigned char port_image;
volatile unsigned char variable;

#define RAZRIAD0 0
#define RAZRIAD1 1
#define RAZRIAD2 2
#define RAZRIAD3 3

#define TARGET_BIT0 3
#define TARGET_BIT1 5
#define TARGET_BIT2 7
#define TARGET_BIT3 2


variable = 0xFF;

port_image |= ((variable & (1<<RAZRIAD0)) > > RAZRIAD0)< < TARGET_BIT0;
port_image |= ((variable & (1<<RAZRIAD1)) > > RAZRIAD1) < < TARGET_BIT1;
port_image |= ((variable & (1<<RAZRIAD2)) > > RAZRIAD2) < < TARGET_BIT2;
port_image |= ((variable & (1<<RAZRIAD3)) > > RAZRIAD3) < < TARGET_BIT3;