Here is some code I used to control the 4x40 display. This is just the LCD part that demonstrates the enable selection
Code:
'**** LCD *******************************************************
'Set LCD Data port
DEFINE LCD_DREG PORTB
'Set starting Data bit (0 or 4) if 4-bit bus
DEFINE LCD_DBIT 4
'Set LCD Register Select port
DEFINE LCD_RSREG PORTB
'Set LCD Register Select bit
DEFINE LCD_RSBIT 0
'Set LCD Enable port
DEFINE LCD_EREG PORTB
'Set LCD Enable bit
DEFINE LCD_EBIT 3
'LCD RW Register PORT
'DEFINE LCD_RWREG PORTB
'LCD read/write pin bit
'DEFINE LCD_RWBIT 5
'Set LCD bus size (4 or 8 bits)
DEFINE LCD_BITS 4
'Set number of lines on LCD
DEFINE LCD_LINES 4
'Set command delay time in us
DEFINE LCD_COMMANDUS 2000
'Set data delay time in us
DEFINE LCD_DATAUS 50

LCD1_Disable    var portb.2
LCD2_Disable    var portb.1
'*** Program variables *****************************************



lcdcnt     var  byte
lcdlen     var  byte
lcdline var byte
lcd var byte
lcdfunction var byte


'***************************************************************

' Initialize LCD
input LCD1_Disable 
input LCD2_Disable 
LCDOut $fe,1   'clear lcd
pause 100
LCDOut $fe,2   'home
LCDOut $fe,$0c 'Curser off
LCDOut "              USB 4X40 LCD   "
LCDOut $FE,$C0
LCDOut "              DAVE CUTLIFF    "
low LCD1_Disable 
input LCD2_Disable 
LCDOut $fe,1   'clear lcd
LCDOut $fe,2   'home
LCDOut $fe,$0c 'Curser off
LCDOut "         Highspeed USB Project  "
LCDOut $FE,$C0
LCDOut "             August 2005    "   
pause 100
goto idleloop