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
1
2
3
4
5
39
40
. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . .
00 01 02 03 04
40 41 42 43 44
26 27
66 67
DDRAM
address
(hexadecimal)
Figure 4 2-Line Display
Display
position
1
2
3
4
5
6
7
8
00 01 02 03 04 05 06 07
40 41 42 43 44 45 46 47
DDRAM
address
01 02 03 04 05 06 07 08
41 42 43 44 45 46 47 48
For
shift left
27 00 01 02 03 04 05 06
67 40 41 42 43 44 45 46
For
shift right
Figure 5 2-Line by 8-Character Display Example
11
HITACHI [ HITACHI SEMICONDUCTOR ]
