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PICDEM™ 17 Demonstration Board User’s Guide
DS39024B-page 54 2001 Microchip Technology Inc.
#else // Lower nibble
interface
data |= DATA_PORT&0x0f; // Read the lower
nibble of data
#endif
E_PIN = 0;
RS_PIN = 0; // Reset the control
bits
RW_PIN = 0;
#endif
return(data); // Return the data
byte
}
/
*******************************************************************
*
* Function Name: WriteDataXLCD
* Return Value: void
* Parameters: data: data byte to be written to LCD
* Description: This routine writes a data byte to the
* Hitachi HD44780 LCD controller. The user
* must check to see if the LCD controller is
* busy before calling this routine. The data
* is written to the character generator RAM or
* the display data RAM depending on what the
* previous SetxxRamAddr routine was called.
*******************************************************************
*/
void WriteDataXLCD(static char data)
{
while(BusyXLCD());
#ifdef BIT8 // 8-bit interface
TRIS_DATA_PORT = 0; // Make port output
DATA_PORT = data; // Write data to port
RS_PIN = 1; // Set control bits
RW_PIN = 0;
DelayFor18TCY();
E_PIN = 1; // Clock data into
LCD
DelayFor18TCY();
E_PIN = 0;
RS_PIN = 0; // Reset control
bits
TRIS_DATA_PORT = 0xff; // Make port input
#else // 4-bit interface
#ifdef UPPER // Upper nibble
interface
TRIS_DATA_PORT &= 0x0f;
DATA_PORT &= 0x0f;
DATA_PORT |= data&0xf0;
#else // Lower nibble
interface
TRIS_DATA_PORT &= 0xf0;
DATA_PORT &= 0xf0;
DATA_PORT |= ((data>>4)&0x0f);
#endif
RS_PIN = 1; // Set control bits
RW_PIN = 0;