int R_data = 12;
int R_clk = 10;
int R_latch = 11;

int C_data = 4;
int C_clk = 2;
int C_latch = 3;

void test() {
  digitalWrite(R_latch, 0);
  digitalWrite(C_latch, 0);

  shiftOut(R_data, R_clk, LSBFIRST, 0b1010101010);
  shiftOut(C_data, C_clk, LSBFIRST, 0b10101010);

  digitalWrite(R_latch, 1);
  digitalWrite(C_latch, 1);
}

void setup() {
  pinMode(R_data, OUTPUT);
  pinMode(R_clk, OUTPUT);
  pinMode(R_latch, OUTPUT);

  pinMode(C_data, OUTPUT);
  pinMode(C_clk, OUTPUT);
  pinMode(C_latch, OUTPUT);

  test();
}

void loop() {
  for(int i=0; i<8; i++) {
    for(int j=0; j<8; j++) {
      digitalWrite(R_latch, 0);
      digitalWrite(C_latch, 0);
      
      shiftOut(R_data, R_clk, LSBFIRST, 1 << j);
      shiftOut(C_data, C_clk, LSBFIRST, 1 << i);
      
      digitalWrite(R_latch, 1);
      digitalWrite(C_latch, 1);
      //delay(100);
    }
  }
}