Sigma DE2-70 User Manual
DE2-70 User Manual
40
5.5 Using the LCD Module
The LCD module has built-in fonts and can be used to display text by sending appropriate
commands to the display controller, which is called HD44780. Detailed information for using the
display is available in its datasheet, which can be found on the manufacturer's web site, and from
the Datasheet/LCD folder on the DE2-70 System CD-ROM. A schematic diagram of the LCD
module showing connections to the Cyclone II FPGA is given in Figure 5.9. The associated pin
assignments appear in Table 5.6.
LC
D
_D
2
LC
D
_V
C
C
LC
D
_D
0
LC
D
_D
6
LC
D
_D
7
LC
D
_D
1
LC
D
_D
4
LC
D
_B
L
LC
D
_D
3
L
C
D
_D
5
LC
D
_C
O
N
T
LCD_D[0..7]
LCD_BLON
LCD_ON
LC
D
_E
N
LC
D
_R
S
LC
D
_R
W
VCC43
VCC43
VCC43
VCC5
R38
1K
R38
1K
2 X 16 DIGIT LCD
DIS1
LCD-2x16
2 X 16 DIGIT LCD
DIS1
LCD-2x16
G
N
D
1
VC
C
2
C
O
N
T
3
R
S
4
R
W
5
EN
6
D
0
7
D
1
8
D
2
9
D
3
10
D
4
11
D
5
12
D
6
13
D
7
14
BL
15
G
N
D
16
Q5
8050
8050
Q5
8050
8050
R39
47
R39
47
R36
680
R36
680
R37
680
R37
680
Q3
8050
8050
Q3
8050
8050
Q4
8550
Q4
8550
C6
1u
C6
1u
Q2
8550
Q2
8550
Q1
8050
Q1
8050
R35
680
R35
680
R34
680
R34
680
Figure 5.9. Schematic diagram of the LCD module.
Signal Name
FPGA Pin No.
Description
LCD_DATA[0] PIN_E1
LCD
Data[0]
LCD_DATA[1] PIN_E3
LCD
Data[1]
LCD_DATA[2] PIN_D2
LCD
Data[2]
LCD_DATA[3] PIN_D3
LCD
Data[3]
LCD_DATA[4] PIN_C1
LCD
Data[4]