HD44780U Datasheet, PDF (11/59 Pages) Hitachi Semiconductor – Dot Matrix Liquid Crystal Display Controller/Driver

HD44780U
• 2-line display (N = 1) (Figure 4)
 Case 1: When the number of display characters is less than 40 × 2 lines, the two lines are displayed
from the head. Note that the first line end address and the second line start address are not
consecutive. For example, when just the HD44780 is used, 8 characters × 2 lines are displayed. See
Figure 5.
When display shift operation is performed, the DDRAM address shifts. See Figure 5.
Display
position
123 45
DDRAM
00 01 02 03 04 ^{. . . . . . . . . . . . . . . . . .}
address
(hexadecimal) ⁴⁰
41
42
43
44
..................
39 40
26 27
66 67
Figure 4 2-Line Display
Display
position
12345678
DDRAM ^{00 01 02 03 04 05 06 07}
address
40 41 42 43 44 45 46 47
For
shift left
01 02 03 04 05 06 07 08
41 42 43 44 45 46 47 48
For
27 00 01 02 03 04 05 06
shift right
67 40 41 42 43 44 45 46
Figure 5 2-Line by 8-Character Display Example
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