HD66712 Datasheet, PDF (19/88 Pages) Hitachi Semiconductor – Dot-Matrix Liquid Crystal Display Controller/Driver

HD66712U
 Case 2: Figure 7 shows the case where the EXT pin is fixed high and the HD66712 and the 40-
output extension driver are used to extend the number of display characters to 32 5-dot font-width
characters.
In this case, COM9 to COM16 begins at (0C)H, and COM25 to COM32 at (4C)H.
When a display shift is performed, the DDRAM addresses shift as shown.
COM1 to
COM8
COM17 to
COM24
1 2 3 4 5 6 7 8 9 10 11 12
00 01 02 03 04 05 06 07 08 09 0A 0B
13 14 15 16 17 18 19 20 21 22 23 24
0C 0D 0E 0F 10 11 12 13 14 15 16 17
25 26 27 28 29 30 31 32
18 19 1A 1B 1C 1D 1E 1F
Display position
COM9 to COM16
40 41 42 43 44 45 46 47 48 49 4A 4B
HD66712
SEG1–SEG60
4C 4D 4E 4F 50 51 52 53 54 55 56 57
HD66712
SEG1–SEG60
58 59 5A 5B 5C 5D 5E 5F
Extension driver
Seg1–Seg40
COM25 to COM32
DDRAM address
COM1 to
COM8
COM17 to
COM24
COM1 to
COM8
COM17 to
COM24
1 2 3 4 5 6 7 8 9 10 11 12
01 02 03 04 05 06 07 08 09 0A 0B 0C
13 14 15 16 17 18 19 20 21 22 23 24
0D 0E 0F 10 11 12 13 14 15 16 17 18
25 26 27 28 29 30 31 32 (Left shift display)
19 1A 1B 1C 1D 1E 1F 20 COM9 to COM16
41 42 43 44 45 46 47 48 49 4A 4B 4C
27 00 01 02 03 04 05 06 07 08 09 0A
4D 4E 4F 50 51 52 53 54 55 56 57 58
0B 0C 0D 0E 0F 10 11 12 13 14 15 16
59 5A 5B 5C 5D 5E 5F 60 COM25 to COM32
(Right shift display)
17 18 19 1A 1B 1C 1D 1E COM9 to COM16
67 40 41 42 43 44 45 46 47 48 49 4A 4B 4C 4D 4E 4F 50 51 52 53 54 55 56 57 58 59 5A 5B 5C 5D 5E COM25 to COM32
Figure 7 2-Line by 32 Character Display (5-Dot Font Width)
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