LCD_IO 8

Using connection mode 8:

Using connection mode will require R/W, RS, Enable and all 8 data lines.

The data lines must all be connected to the same I/O port, in sequential order. For example, DB0 to PORTB.0, DB1 to PORTB.1 and so on, with DB7 going to PORTB.7.

Relevant Constants:

These constants are used to control settings for the Liquid Crystal Display routines included with Great Cow BASIC. To set them, place a line in the main program file that uses #define to assign a value to the particular constant.

Constants are required for 8-bit mode as follows.

Constant Name Controls Default Value

LCD_SPEED

FAST, MEDIUM or SLOW.

MEDIUM

LCD_IO

The I/O mode. Can be 2, 4 or 8.

8

LCD_RS

Specifies the output pin that is connected to Register Select on the LCD.

Must be defined

LCD_RW

Specifies the output pin that is connected to Read/Write on the LCD. The R/W pin can be disabled*.

Must be defined (unless R/W is disabled)

LCD_Enable

Specifies the output pin that is connected to Read/Write on the LCD.

Must be defined

LCD_DATA_PORT

Output port used to interface with LCD data bus

Must be defined

LCD_LAT

Drives the port with LATx support. Resolves issues with faster Mhz and the Microchip PIC read/write/modify feature. See example below.

Optional

The R/W pin can be disabled by setting the LCD_NO_RW constant. If this is done, there is no need for the R/W to be connected to the chip, and no need for the LCD_RW constant to be set. Ensure that the R/W line on the LCD is connected to ground if not used.

For a code example download Eight Wire LCD example.

For code examples see Eight Wire Examples.

See the separate sections of the Help file for the specifics of each Connection Mode.

For more help, see LCD_IO 0, LCD_IO 1, LCD_IO 2, LCD_IO 2_74xx164, LCD_IO 2_74xx174, LCD_IO 4, LCD_IO 10 or LCD_IO 12