2x16 LCD Module with HD44780 + 16F877A

[comwarrior]

i've just baught the above LCD from a well known auction site (not sure if i'm allowed to say what)...

All the searches i've done point to LCD data lines on portA and IO on portB...
on the 16F877A, PortA and PortE are analogue and i'm using the analogue ports...

Can i change (somewhere) what pins the LCD is connected to and still use LCDOUT and LCDIN?

Thanks

[mackrackit]

Yes, look in your PBP manual and read about defining the LCD.
Here is an example (for a different PIC)

    DEFINE LCD_DREG     PORTG 
    DEFINE LCD_DBIT     0
    DEFINE LCD_RSREG    PORTE 
    DEFINE LCD_RSBIT    0
    DEFINE LCD_EREG     PORTE 
    DEFINE LCD_EBIT     1
    DEFINE LCD_BITS     4 
    DEFINE LCD_LINES    4
    DEFINE LCD_COMMANDUS    3000 
    DEFINE LCD_DATAUS   150

DREG has to be all on the same port, either upper or lower. DT has a LCD ANY PIN trick someplace if if you are adventurous

[comwarrior]

ahhh, yes, i remember reading about those now...

thanks dave

[comwarrior]

Is their any speed advantage to using 8 bits instead of 4?

thanks

[Melanie]

Yes, it's twice as fast!

[mackrackit]

Twice as many pins used or twice as fast. Take your pick.