Rainbow Electronics HD44780 - Manual (Page 40)

HD44780U
40
Table 11 8-Bit Operation, 8-Digit
×
1-Line Display Example with Internal Reset
Step
Instruction
No. RS R/ W DB7 DB6 DB5 DB4 DB3 DB2 DB1 DB0 Display Operation
1 Power supply on (the HD44780U is initialized by the internal
reset circuit) Initialized. No display.
2 Function set
0
0 0 0 1 1 0 0 * *
Sets to 8-bit operation and
selects 1-line display and 5
× 8
dot character font. (Number of
display lines and character
fonts cannot be changed after
step #2.)
3 Display on/off control
0
0 0 0 0 0 1 1 1 0
_
Turns on display and cursor.
Entire display is in space mode
because of initialization.
4 Entry mode set
0
0 0 0 0 0 0 1 1 0
_
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.
5 Write data to CGRAM/DDRAM
1
0 0 1 0 0 1 0 0 0
H_
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.
6 Write data to CGRAM/DDRAM
1
0 0 1 0 0 1 0 0 1
HI_
Writes I.
7 ·
·
·
·
· ·
·
·
·
·
8 Write data to CGRAM/DDRAM
1
0 0 1 0 0 1 0 0 1
HITACHI_
Writes I.
9 Entry mode set
0
0 0 0 0 0 0 1 1 1
HITACHI_
Sets mode to shift display at
the time of write.
10 Write data to CGRAM/DDRAM
1
0 0 0 1 0 0 0 0 0
ITACHI _
Writes a space.