User Manual

HD44780U
12
 Case 2: For a 16-character × 2-line display, the HD44780 can be extended using one 40-output
extension driver. See Figure 6.
When display shift operation is performed, the DDRAM address shifts. See Figure 6.
DDRAM
address
Display
position
1 2345678910111213141516
00 01 02 03 04 05 06 07 08 09 0A 0B0C0D 0E 0F
For
shift left
00 01 02 03 04 05 06 07 08 09 0A 0B0C0D 0E27
40 41 42 43 44 45 46 47 48 49 4A 4B4C4D 4E 4F
HD44780U display Extension driver
display
0201 03 04 05 06 07 08 09 0A 0B0C0D 0E 0F10
For
shift right
41 42 43 44 45 46 47 48 49 4A 4B4C4D4E 4F 50
40 41 42 43 44 45 46 47 48 49 4A 4B4C4D 4E67
Figure 6 2-Line by 16-Character Display Example