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Hitachi HD44780 Quick Manual page 2

Lcd module
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4-bit interface
bus lines DB0-DB3 disabled
4 high order bits followed by 4 low order bits
Instruction Set
Designate functions
1.
(display format, data length etc.)
Set internal RAM address
2.
Data transfer
D t t
f
3.
Miscellaneous functions
4.
Instructions - Legend
Display addressing
Display position
1
2
3
4
DDRAM address
00
01
02
03
(row 1)
DDRAM address
40
41
42
43
(row 2)
Internal Reset Procedure
1. Display clear
2. Function set:
DL = 1; 8-bit interface data
N = 0; 1-line display
F = 0; 5 x 8 dot character font
3. Display on/off control:
D = 0; Display off
C = 0; Cursor off
B = 0; Blinking off
4. Entry mode set:
I/D = 1; Increment by 1
S = 0; No shift
5
...
39
40
04
...
26
27
44
...
66
67
2

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