Pinout:

1	GND
2	+5V
3	Kontrast, ca. -4.1V
4	RS
5	RW
6	E
7	DB0
8	DB1
9	DB2
10	DB3
11	DB4
12	DB5
13	DB6
14	DB7
15	AT27 Pin 30 > A13
16	AT27 Pin 31 > A14

Display ist MS = +5V = 68 Series Interface

Pins 15 & 16 schalten die Zeichenbänke im AT27 um.
Im AT27 sind große Zeichen, 8x16 Pixel, 24 Zeichen pro Zeile
A13 und A14 = 0 = Normaler ASCII Zeichensatz + Sonderzeichen
Andere Kombinationen = Normale Zeichen + Japanische Zeichen

Für weitere Funktionen wie Textcursor, blinken, etc. ins 
Datenblatt des LC7980 schauen

Routinen zum Schreiben des Kommando- sowie Datenregisters.
Die Pausenzeiten müssen halt je nach µC angepasst werden.

void lcd_write_cmd(unsigned char cmd)
{
	static unsigned short tout;
	LCD_RW = 0;
	LCD_RS = 1;
	LCD_E = 0;
	LCD_DATA_DIR = DATA_DIR_OUT;
	
	LCD_DATA_OUT = cmd;
	
	for(tout = 0; tout < 200; tout++)
	{ _asm NOP _endasm; }

	LCD_E = 1;

	for(tout = 0; tout < 200; tout++)
	{ _asm NOP _endasm; }

	LCD_E = 0;
	
}

void lcd_write_data(unsigned char dta)
{
	static unsigned short tout;
	LCD_RW = 0;
	LCD_RS = 0;
	LCD_E = 0;
	LCD_DATA_DIR = DATA_DIR_OUT;
	
	LCD_DATA_OUT = dta;
	
	for(tout = 0; tout < 100; tout++)
	{ _asm NOP _endasm; }

	LCD_E = 1;

	for(tout = 0; tout < 100; tout++)
	{ _asm NOP _endasm; }

	LCD_E = 0;
	
}

Code für Disaplay-Init im Grafikmodus, 192 x 32 Pixel:

void lcd_init_gfx(void)
{
	unsigned short cnt;
	
	// display control
	lcd_write_cmd (0b00000000);
	lcd_write_data(0b00000010);

	// character pitch
	lcd_write_cmd (0b00000001);
	lcd_write_data(0x77);

	// num chars
	lcd_write_cmd (0b00000010);
	lcd_write_data(23);
	
	// display duty
	lcd_write_cmd (0b00000011);
	lcd_write_data(32);

	// cursor postition
	lcd_write_cmd (0b00000100);
	lcd_write_data(0);

	// display start lower
	lcd_write_cmd (0b00001000);
	lcd_write_data(0);

	// display start upper
	lcd_write_cmd (0b00001001);
	lcd_write_data(0);

	// cursor lower
	lcd_write_cmd (0b00001010);
	lcd_write_data(0);

	// cursor upper
	lcd_write_cmd (0b00001011);
	lcd_write_data(0);
	
	// write data -> all 0 -> clear display
	// display clar
	for(cnt = 0; cnt < 768; cnt++)
	{
		lcd_write_cmd (0b00001100);
		lcd_write_data(0);
	}
	
	// display control
	lcd_write_cmd (0b00000000);
	lcd_write_data(0b00100010);
}



Code für Display-Init im Textmodus, 5x8 Pixel Zeichen 
interner Zeichensatz, 32 zeichen pro Zeile, 4 Zeilen:

void lcd_init_txt_internal_cg(void)
{
	unsigned short cnt;
	
	// display control
	lcd_write_cmd (0b00000000);
	lcd_write_data(0b00000000);

	// character pitch
	lcd_write_cmd (0b00000001);
	lcd_write_data(0x75);

	// num chars
	lcd_write_cmd (0b00000010);
	lcd_write_data(30);
	
	// display duty
	lcd_write_cmd (0b00000011);
	lcd_write_data(32);

	// cursor postition
	lcd_write_cmd (0b00000100);
	lcd_write_data(0);

	// display start lower
	lcd_write_cmd (0b00001000);
	lcd_write_data(0);

	// display start upper
	lcd_write_cmd (0b00001001);
	lcd_write_data(0);

	// cursor lower
	lcd_write_cmd (0b00001010);
	lcd_write_data(0);

	// cursor upper
	lcd_write_cmd (0b00001011);
	lcd_write_data(0);
	
	// write data -> clear display
	for(cnt = 0; cnt < 128; cnt++)
	{
		lcd_write_cmd (0b00001100);
		lcd_write_data(32);
	}

	// display control
	lcd_write_cmd (0b00000000);
	lcd_write_data(0b00100000);
}



Code für Display-Init im Textmodus, 8x16 Pixel Zeichen
externer Zeichensatz, 24 zeichen pro Zeile, 2 Zeilen:

void lcd_init_txt_external_cg(void)
{
	unsigned short cnt;
	
	// display control
	lcd_write_cmd (0b00000000);
	lcd_write_data(0b00000001);

	// character pitch
	lcd_write_cmd (0b00000001);
	lcd_write_data(0xF7);

	// num chars
	lcd_write_cmd (0b00000010);
	lcd_write_data(22);
	
	// display duty
	lcd_write_cmd (0b00000011);
	lcd_write_data(32);

	// cursor postition
	lcd_write_cmd (0b00000100);
	lcd_write_data(0);

	// display start lower
	lcd_write_cmd (0b00001000);
	lcd_write_data(0);

	// display start upper
	lcd_write_cmd (0b00001001);
	lcd_write_data(0);

	// cursor lower
	lcd_write_cmd (0b00001010);
	lcd_write_data(0);

	// cursor upper
	lcd_write_cmd (0b00001011);
	lcd_write_data(0);
	
	// write data -> clear display
	for(cnt = 0; cnt < 48; cnt++)
	{
		lcd_write_cmd (0b00001100);
		lcd_write_data(32);
	}

	// display control
	lcd_write_cmd (0b00000000);
	lcd_write_data(0b00100001);
}