Rainbow Electronics HD44780 - Manual (Page 43)

HD44780U
43
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 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 1 0 * *
Sets to 8-bit operation and
selects 2-line display and 5
×
8
dot character font.
3 Display on/off control
0
0 0 0 0 0 1 1 1 0
_
Turns on display and cursor.
All 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 ·
·
·
·
· ·
·
·
·
·
7 Write data to CGRAM/DDRAM
1
0 0 1 0 0 1 0 0 1
HITACHI_
Writes I.
8 Set DDRAM address
0
0 1 1 0 0 0 0 0 0
HITACHI
_
Sets DDRAM address so that
the cursor is positioned at the
head of the second line.