HD44780U Hitachi Semiconductor (acquired by Renesas), HD44780U Datasheet - Page 43

• Manufacturer Part Number: HD44780U
• Description: Dot Matrix Liquid Crystal Display Controller/driver
• Manufacturer: Hitachi Semiconductor (acquired by Renesas)

Table 12
Step
No.
1
2
3
4
5
Note:
6
RS
Power supply on (the HD44780U is initialized by the internal
reset circuit)
Function set
0
Function set
0
0
Display on/off control
0
0
Entry mode set
0
0
Write data to CGRAM/DDRAM
1
1
The control is the same as for 8-bit operation beyond step #6.
R/
0
0
0
0
0
0
0
0
0
: :
4-Bit Operation, 8-Digit
DB7 DB6 DB5 DB4
0
0
0
0
1
0
0
0
1
0
0
0
0
1
0
1
1
0
1
1
*
0
1
0
1
0
0
Instruction
0
0
*
0
0
0
0
0
0
1-Line Display Example with Internal Reset
Display
H_
_
Operation
Initialized. No display.
Sets to 4-bit operation.
In this case, operation is
handled as 8 bits by initializa-
tion, and only this instruction
completes with one write.
Sets 4-bit operation and selects
1-line display and 5
character font. 4-bit operation
starts from this step and
resetting is necessary. (Number
of display lines and character
fonts cannot be changed after
step #3.)
Turns on display and cursor.
Entire 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.
The cursor is incremented by
one and shifts to the right.
HD44780U
8 dot
209