© MCS Electronics, 1995-2007

CONFIG LCDBUS

Action

Configures the LCD data bus and overrides the compiler setting.

Syntax

CONFIG LCDBUS = constant

Remarks

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.

See also

CONFIG LCD

Example

'file: LCD.BAS

'demo: LCD, CLS, LOWERLINE, SHIFTLCD, SHIFTCURSOR, HOME

'CURSOR, DISPLAY

'--------------------------------------------------------------

'note : tested in bus mode with 4-bit on the STK200

page -359-

© MCS Electronics, 1995-2007

'D0-D3 are not connected since 4 bit bus mode is used!

'Config Lcdpin = Pin , Db4 = Portb.1 , Db5 = Portb.2 , Db6 = Portb.3 , Db7 = Portb.4 , E = Portb.5 , Rs = Portb.6

Rem with the config lcdpin statement you can override the compiler settings

$regfile = "8515def.dat" $lcd = &HC000

$lcdrs = &H8000 Config Lcdbus = 4

Dim A As Byte

Config Lcd = 16 * 2 'configure lcd screen

'other options are 16 * 2 , 16 * 4 and 20 * 4, 20 * 2 , 16 * 1a 'When you dont include this option 16 * 2 is assumed

'16 * 1a is intended for 16 character displays with split addresses over 2 lines

page -360-

© MCS Electronics, 1995-2007

have external RAM and so have an address and data bus on your system. The RS and E line of the LCD display can be connected to an address decoder. Simply writing to an external memory location select the LCD and the data is sent to the LCD display. This means the data-lines of the LCD display are fixed to the data-bus lines.

Use $LCD = address and $LCDRS = address, to specify the addresses that will enable the E and RS lines.

See also

CONFIG LCD , $LCD , $LCDRS

Example

Config LCDMODE = PORT 'the report will show the settings

Config LCDBUS = 4 '4 bit mode

LCD "hello"

CONFIG LCDPIN

Action

Override the LCD-PIN select options.

Syntax

CONFIG LCDPIN = PIN , DB4= PN,DB5=PN, DB6=PN, DB7=PN, E=PN, RS=PN

CONFIG LCDPIN = PIN , PORT=PORTx, E=PN, RS=PN

Remarks

You can override the PIN selection from the Compiler Settings with this statement, so a second configuration lets you not choose more pins for a second LCDdisplay.

The config command is preferred over the menu settings since the code makes clear which pins are used. The CONFIG statement overrides the Options setting.

See also

CONFIG LCD

Example

page -362-

'-----------------------------------------------------------------------------

------------

$sim

'REMOVE the above command for the real program !! '$sim is used for faster simulation

'note : tested in PIN mode with 4-bit

'Config Lcdpin = Pin , Db4 = Portb.1 , Db5 = Portb.2 , Db6 = Portb.3 , Db7 = Portb.4 , E = Portb.5 , Rs = Portb.6

Config Lcdpin = Pin , Db4 = Porta.4 , Db5 = Porta.5 , Db6 = Porta.6 , Db7 = Porta.7 , E = Portc.7 , Rs = Portc.6

'These settings are for the STK200 in PIN mode

'Connect only DB4 to DB7 of the LCD to the LCD connector of the STK D4-D7 'Connect the E-line of the LCD to A15 (PORTC.7) and NOT to the E line of the LCD connector

'Connect the RS, V0, GND and =5V of the LCD to the STK LCD connector

Rem with the config lcdpin statement you can override the compiler settings

Dim A As Byte

Config Lcd = 16 * 2 'configure lcd screen

'other options are 16 * 4 and 20 * 4, 20 * 2 , 16 * 1a 'When you dont include this option 16 * 2 is assumed

'16 * 1a is intended for 16 character displays with split addresses over 2 lines

Wait 1

For A = 1 To 10

page -363-

Rem it is important that a CLS is following the deflcdchar statements because

page -364-