hd66712u Renesas Electronics Corporation., hd66712u Datasheet - Page 21

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

HD66712U
384
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.
01 02 03 04 05 06
21 22 23 24 25 26
41 42 43 44 45 46
61 62 63 64 65 66
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
COM17 to 24
COM25 to 32
COM9 to 16
COM1 to 8
07 08 09
27 28 29
47 48 49
67 68 69
(Left shift display)
Figure 9 4-Line by 20-Character Display
00 01 02 03 04 05 06
20 21 22 23 24 25 26
40 41 42 43 44 45 46
60 61 62 63 64 65 66
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
0A 0B 0C
2A 2B 2C
4A 4B 4C
6A 6B 6C
0D 0E 0F 10
2D 2E 2F 30
4D
6D 6E 6F 70
HD66712
4E
4F 50
07 08 09
27 28 29
47 48 49
67 68 69
11 12 13
31 32 33
51 52 53
71 72 73
0A 0B
2A 2B
4A 4B
6A 6B
00
20
40
60
0C 0D 0E 0F 10
2C 2D 2E 2F 30
4C 4D 4E 4F 50
6C 6D 6E 6F 70
Extension driver
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
13
33
53
73
00 01 02 03 04 05 06
20 21 22 23 24 25 26
40 41 42 43 44 45 46
60 61 62 63 64 65 66
11 12 13
31 32 33
51 52 53
71 72 73
(Right shift display)
07 08 09
27 28 29
47 48 49
67 68 69
Display position
DDRAM address
2A
6A
0A
4A
0B 0C 0D 0E 0F 10
2B 2C 2D 2E 2F 30
4B 4C 4D 4E 4F 50
6B 6C 6D 6E 6F 70
11 12
31 32
51 52
71 72