Greetings from France 
I have a HD44780 LCD and I want to clear the display with the command binary 0b00000001 how it's done?
with the library liquidCristal possible.
I have an arduino uno 3
thank you for reading.
Excuse my English, it is a translator 
hello,
I know the order.
my interest is how it works.
thank you for reading.
go to ...\arduino-1.0\libraries\LiquidCrystal\LiquidCrystal.cpp
and have a look:
void LiquidCrystal::clear()
{
 command(LCD_CLEARDISPLAY); // clear display, set cursor position to zero
 delayMicroseconds(2000); // this command takes a long time!
}
...
inline void LiquidCrystal::command(uint8_t value) {
 send(value, LOW);
}
...
send() definition is just a few lines below...
In LiquidCrystal.h you find
#define LCD_CLEARDISPLAY 0x01
but that you knew already.
You find as well that
void command(uint8_t); is declared in the public part, though not documented...
Nice for experimenting yourself ...
thank XD