HD66712 Datasheet, PDF (56/88 Pages) Hitachi Semiconductor – Dot-Matrix Liquid Crystal Display Controller/Driver

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