AVR Freaks

Quote:
I read the data sheet and say that if you are using the internal clock they won't work..

Sounds weird. Where in the datasheet can we read that?

"Sounds weird. Where in the datasheet can we read that?"
Yes is in page 79.. With the title: • XTAL2/TOSC2/PCINT7 – Port B, Bit 7.

• XTAL2/TOSC2/PCINT7 – Port B, Bit 7

XTAL2: Chip clock Oscillator pin 2. Used as clock pin for crystal oscillator or Low-frequency crystal Oscillator. When used as a clock pin, the pin can not be used as an I/O pin.

TOSC2: Timer Oscillator pin 2. Used only if internal calibrated RC Oscillator is selected as chip clock source, and the asynchronous timer is enabled by the correct setting in ASSR. When the AS2 bit in ASSR is set (one) and the EXCLK bit is cleared (zero) to enable asynchronous clocking
of Timer/Counter2 using the Crystal Oscillator, pin PB7 is disconnected from the port, and becomes the inverting output of the Oscillator amplifier. In this mode, a crystal Oscillator is connected to this pin, and the pin cannot be used as an I/O pin.

PCINT7: Pin Change Interrupt source 7. The PB7 pin can serve as an external interrupt source.

If PB7 is used as a clock pin, DDB7, PORTB7 and PINB7 will all read 0.

digitalWrite(pin_number, state);

const uint8_t PROGMEM digital_pin_to_bit_mask_PGM[] = {
	_BV(0), /* 0, port D */
	_BV(1),
	_BV(2),
	_BV(3),
	_BV(4),
	_BV(5),
	_BV(6),
	_BV(7),
	_BV(0), /* 8, port B */
	_BV(1),
	_BV(2),
	_BV(3),
	_BV(4),
	_BV(5),
	_BV(0), /* 14, port C */
	_BV(1),
	_BV(2),
	_BV(3),
	_BV(4),
	_BV(5),
};

state = digitalRead(pin_numer);

int ledPin = 13;                // choose the pin for the LED
int inputPin = 2;               // choose the input pin (for a pushbutton)
int val = 0;                    // variable for reading the pin status

void setup() {
  pinMode(ledPin, OUTPUT);      // declare LED as output
  pinMode(inputPin, INPUT);     // declare pushbutton as input
}

void loop(){
  val = digitalRead(inputPin);  // read input value
  if (val == HIGH) {            // check if the input is HIGH
    digitalWrite(ledPin, LOW);  // turn LED OFF
  } else {
    digitalWrite(ledPin, HIGH); // turn LED ON
  }
}

/*
 * Button
 * by DojoDave 
 *
 * Turns on and off a light emitting diode(LED) connected to digital
 * pin 13, when pressing a pushbutton attached to pin 7.
 *
 * http://www.arduino.cc/en/Tutorial/Button
 */

#include "WProgram.h"
void setup();
void loop();
int ledPin = 13;                // choose the pin for the LED
int inputPin = 2;               // choose the input pin (for a pushbutton)
int val = 0;                    // variable for reading the pin status

void setup() {
  pinMode(ledPin, OUTPUT);      // declare LED as output
  pinMode(inputPin, INPUT);     // declare pushbutton as input
}

void loop(){
  val = digitalRead(inputPin);  // read input value
  if (val == HIGH) {            // check if the input is HIGH
    digitalWrite(ledPin, LOW);  // turn LED OFF
  } else {
    digitalWrite(ledPin, HIGH); // turn LED ON
  }
}

int main(void)
{
        init();

        setup();

        for (;;)
                loop();

        return 0;
}

void setup()
{
  DDRB = 0;
  DDRC = 0xFF;
}

void loop()
{
  if (PINB & (1<<PB6)) {
    PORTC = 0xFF;
  }
  else {
    PORTC = 0x00;
  }
}

#include "WProgram.h"
void setup();
void loop();
void setup()
{
  DDRB = 0;
  DDRC = 0xFF;
}

void loop()
{
  if (PINB & (1<<PB6)) {
    PORTC = 0xFF;
  }
  else {
    PORTC = 0x00;
  }
}

int main(void)
{
        init();

        setup();

        for (;;)
                loop();

        return 0;
}

int main(void)
  bc:   0e 94 0c 01     call    0x218   ; 0x218 
#include "WProgram.h"
void setup();
void loop();
void setup()
{
  DDRB = 0;
  c0:   14 b8           out     0x04, r1        ; 4
  DDRC = 0xFF;
  c2:   8f ef           ldi     r24, 0xFF       ; 255
  c4:   87 b9           out     0x07, r24       ; 7
}

void loop()
{
  if (PINB & (1<<PB6)) {
  c6:   1e 9b           sbis    0x03, 6 ; 3
  c8:   02 c0           rjmp    .+4             ; 0xce 
    PORTC = 0xFF;
  ca:   88 b9           out     0x08, r24       ; 8
  cc:   fc cf           rjmp    .-8             ; 0xc6 
  }
  else {
    PORTC = 0x00;
  ce:   18 b8           out     0x08, r1        ; 8
  d0:   fa cf           rjmp    .-12            ; 0xc6 

 Directory of C:\arduino-0012\hardware\cores

18/09/2008  12:49              .
18/09/2008  12:49              ..
18/09/2008  12:49              arduino
18/09/2008  12:49              atmega8

##############################################################

atmega8.name=Arduino NG or older w/ ATmega8


atmega8.build.mcu=atmega8
atmega8.build.f_cpu=16000000L
atmega8.build.core=arduino

##############################################################

atmega168.name=Arduino NG or older w/ ATmega168


atmega168.build.mcu=atmega168
atmega168.build.f_cpu=16000000L
atmega168.build.core=arduino

##############################################################

mini.name=Arduino Mini


mini.build.mcu=atmega168
mini.build.f_cpu=16000000L
mini.build.core=arduino

##############################################################

bt.name=Arduino BT


bt.build.mcu=atmega168
bt.build.f_cpu=16000000L
bt.build.core=arduino

##############################################################

diecimila.name=Arduino Diecimila


diecimila.build.mcu=atmega168
diecimila.build.f_cpu=16000000L
diecimila.build.core=arduino

##############################################################

nano.name=Arduino Nano


nano.build.mcu=atmega168
nano.build.f_cpu=16000000L
nano.build.core=arduino

##############################################################

lilypad.name=LilyPad Arduino


lilypad.build.mcu=atmega168
lilypad.build.f_cpu=8000000L
lilypad.build.core=arduino

##############################################################

pro.name=Arduino Pro or Pro Mini (8 MHz)


pro.build.mcu=atmega168
pro.build.f_cpu=8000000L
pro.build.core=arduino