Configures the LCD databus.
CONFIG LCDBUS = constant
4 for 4-bit operation, 8 for 8-bit mode (default)
Use this statement together with the $LCD = address statement.
When you use the LCD display in the bus mode the default is to connect all the data lines. With the 4-bit mode you only have to connect data lines d7-d4.
$LCD = &H8000 'address of enable signal
Config LCDBUS = 4 '4 bit mode