HD66712 Datasheet, PDF (21/88 Pages) Hitachi Semiconductor – Dot-Matrix Liquid Crystal Display Controller/Driver

HD66712U
 Case 2: Figure 9 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.
When a display shift is performed, the DDRAM addresses shift as shown.
COM1 to 8
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
00 01 02 03 04 05 06 07 08 09 0A 0B 0C 0D 0E 0F 10 11 12 13
COM9 to 16
20 21 22 23 24 25 26 27 28 29 2A 2B 2C 2D 2E 2F 30 31 32 33
COM17 to 24
40 41 42 43 44 45 46 47 48 49 4A 4B 4C 4D 4E 4F 50 51 52 53
COM25 to 32
60 61 62 63 64 65 66 67 68 69 6A 6B 6C 6D 6E 6F 70 71 72 73
HD66712
Extension driver
Display position
DDRAM address
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
01 02 03 04 05 06 07 08 09 0A 0B 0C 0D 0E 0F 10 11 12 13 00
21 22 23 24 25 26 27 28 29 2A 2B 2C 2D 2E 2F 30 31 32 33 20
41 42 43 44 45 46 47 48 49 4A 4B 4C 4D 4E 4F 50 51 52 53 40
61 62 63 64 65 66 67 68 69 6A 6B 6C 6D 6E 6F 70 71 72 73 60
(Left shift display)
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
13 00 01 02 03 04 05 06 07 08 09 0A 0B 0C 0D 0E 0F 10 11 12
33 20 21 22 23 24 25 26 27 28 29 2A 2B 2C 2D 2E 2F 30 31 32
53 40 41 42 43 44 45 46 47 48 49 4A 4B 4C 4D 4E 4F 50 51 52
73 60 61 62 63 64 65 66 67 68 69 6A 6B 6C 6D 6E 6F 70 71 72
(Right shift display)
Figure 9 4-Line by 20-Character Display
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