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Before running the LCD_DEMO.C sample program, you will need an LCD based on the
HD44780 (or an equivalent) controller.
? LCD_DEMO.C —demonstrates a 4-bit interface to an LCD based on the HD44780 (or an
equivalent) controller.
Connect the LCD to Parallel Port A.
PA0—LCD DB4
Jackrabbit
Prototyping Board
VCC
VCC
VEE
LCD
PA1—LCD DB5
PA2—LCD DB6
PA3—LCD DB7
PA6—LCD RS Register Select
(0 = command, 1 = data)
PA7—LCD E:normally low, latches
on high to low transition
J3
3
5
9
4
6
10
PA0
PA1
PA2
PA3
PA6
PA7
DB4
DB5
DB6
DB7
RS
E
DB0
DB1
DB2
The R/W pin and DB0–DB3 on
DB3
R/W
the LCD are grounded. DB0–DB3
are not used with a 4-bit interface.
This sample program only involves writing, and that is why we ground the R/W pin.
VEE is used to control brightness—the simplest thing to do is ground it. If you need to
control the brightness, you can connect a potentiometer between ground and -5 V, with
the arm going to the VEE pin. Check the specs on the LCD before doing this as some
LCDs may require a different connection. VCC is +5 V and VSS is ground.
Getting Started Manual
23
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