SIGMA DE2-70 - Manual (Page 43)

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 Q5
8050
R39
47
R39
47
R36
680
R36
680
R37 680 R37 680
Q3
8050 Q3
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]