HD44780 Hitachi Semiconductor (acquired by Renesas), HD44780 Datasheet - Page 43

• Manufacturer Part Number: HD44780
• Description: Dot Matrix Liquid Crystal Display Controller/driver
• Manufacturer: Hitachi Semiconductor (acquired by Renesas)

Table 13
Step
No.
1
2
3
4
5
6
7
8
RS
Power supply on (the HD44780U is initialized by the internal
reset circuit)
Function set
0
Display on/off control
0
Entry mode set
0
Write data to CGRAM/DDRAM
1
Write data to CGRAM/DDRAM
1
Set DDRAM address
0
R/W DB7 DB6 DB5 DB4 DB3 DB2 DB1 DB0 Display
0
0
0
0
0
0
8-Bit Operation, 8-Digit 2-Line Display Example with Internal Reset
0
0
0
0
0
1
0
0
0
1
1
1
Instruction
1
0
0
0
0
0
·
·
·
·
·
1
0
0
0
0
0
1
1
0
1
1
0
0
1
1
0
0
0
*
1
1
0
0
0
*
0
0
0
1
0
HITACHI_
HITACHI
_
H_
_
_
·
·
·
·
·
Operation
Initialized. No display.
Sets to 8-bit operation and
selects 2-line display and 5
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.
Sets DDRAM address so that
the cursor is positioned at the
head of the second line.
HD44780U
43
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