hd66712u Renesas Electronics Corporation., hd66712u Datasheet - Page 56

• Manufacturer Part Number: hd66712u
• Description: Dot-matrix Liquid Crystal Display Controller/driver - Hitachi Semiconductor
• Manufacturer: Renesas Electronics Corporation.

Extension Driver LSI Interface
By bringing the EXT pin high, extended driver interface signals (CL1, CL2, D, and M) are output.
Table 14
Display Lines
16
20
24
40
12
16
20
Note: The number of display lines can be extended to 32
2 lines
2 lines
2 lines
2 lines
4 lines
4 lines
4 lines
The number of display lines can be extended to 30
Relationships between the Number of Display Lines and 40-Output Extension Driver
a) 1-chip operation
5-Dot Width 6-Dot Width
Not required Not required
Not required Not required
Not required 1
Disabled
Not required 1
1
1
(EXT = Low, 5-dot font width)
HD66712
EXT
SEG1–
SEG60
Figure 24 HD66712 and the Extension Driver Connection
HD66712
SEG1–SEG60
GND
COM0–
COM33
Disabled
1
2
24
2-line display
1
Disabled
1
1
2
5-Dot Width 6-Dot Width
Not required 1
1
b) When using the extension driver
(EXT = High, 5-dot font width)
HD66712
EXT
V
CC
HD66710
Controller
SEG1–
SEG60
2 lines or 20
2 lines or 20
1
2
Disabled
1
2
3
COM0–
COM33
M
D
CL2
CL1
Extension driver
Seg1–
Seg40
32
4 lines in the LCD-II/F12.
4 lines in the LCD-II/F8.
2-line display
Disabled
Disabled
Disabled
HD44780
5-Dot Width
1
2
2
4
HD66712U
HD66702
1
Disabled
Disabled
Disabled
5-Dot Width
Not required
Not required
3
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