void setup() {
  // Set all pins on PORTK as outputs for digit control
  DDRK = 0xFF; 
  
  // Set all pins on PORTA as outputs for segments (assuming the 7-segment display is connected to PORTA)
  DDRF = 0xFF;
}

void displayDigit(volatile char *buto, unsigned int digitValue, bool isTens) {
  unsigned char digit[] = {
    0x3F, // 0
    0x06, // 1
    0x5B, // 2
    0x4F, // 3
    0x66, // 4
    0x6D, // 5
    0x7D, // 6
    0x07, // 7
    0x7F, // 8
    0x6F  // 9
  };
unsigned int j;
  if (isTens) {
    PORTK &= ~(1 << PK0); // Activate tens digit (e.g., clear PK1)
    //for(j=0;j<10000;j++);
    PORTK |= (1 << PK1);  // Deactivate unit digit (e.g., set PK0)
  } else {
    PORTK &= ~(1 << PK1); // Activate unit digit (e.g., clear PK0)
    for(j=0;j<100000;j++);
    PORTK |= (1 << PK0);  // Deactivate tens digit (e.g., set PK1)

  }

  *buto = digit[digitValue]; // Set the segments for the digit
  delay(5); // Short delay for stable display (5ms is generally enough)
}

void loop() {
  volatile char *buto = (volatile char *)0x31; // Address of PORTA (for segments)
  unsigned int number = 47; // Example number to display

  unsigned int unit = number % 10; // Get the unit digit
  unsigned int tens = number / 10; // Get the tens digit

  // Continuously switch between the tens and unit digits
  while (true) {
    displayDigit(buto, tens, true);  
   // Display the tens digit
    displayDigit(buto, unit, false); 
    delay(1500);// Display the unit digit
  }
}