HD44780U Datasheet, PDF (43/59 Pages) Hitachi Semiconductor – Dot Matrix Liquid Crystal Display Controller/Driver

HD44780U
Table 13 8-Bit Operation, 8-Digit × 2-Line Display Example with Internal Reset
Step
Instruction
No. RS R/W DB7 DB6 DB5 DB4 DB3 DB2 DB1 DB0 Display
1 Power supply on (the HD44780U is initialized by the internal
reset circuit)
Operation
Initialized. No display.
2 Function set
0 00 0 11 1 0* *
3 Display on/off control
_
0 00 0 00 1 11 0
4 Entry mode set
_
0 00 0 00 0 11 0
5 Write data to CGRAM/DDRAM
H_
1 00 1 00 1 00 0
6
·
·
·
·
·
7 Write data to CGRAM/DDRAM
1 00 1 00 1 00 1
·
·
·
·
·
HITACHI_
Sets to 8-bit operation and
selects 2-line display and 5 × 8
dot character font.
Turns on display and cursor.
All display is in space mode
because of initialization.
Sets mode to increment the
address by one and to shift the
cursor to the right at the time of
write to the DD/CGRAM.
Display is not shifted.
Writes H. DDRAM has already
been selected by initialization
when the power was turned on.
The cursor is incremented by
one and shifted to the right.
Writes I.
8 Set DDRAM address
0 01 1 00 0 00 0
HITACHI
_
Sets DDRAM address so that
the cursor is positioned at the
head of the second line.
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