Pantallas lcd hd4478

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HD44780U (LCD-II)
(Dot Matrix Liquid Crystal Display Controller/Driver)
ADE-207-272(Z)
'99.9
Rev. 0.0
Description
The HD44780U dot-matrix liquid crystal display controller and driver LSI displays alphanumerics,
Japanese kana characters, and symbols. It can be configured to drive a dot-matrix liquid crystal display
under the control of a 4- or 8-bit microprocessor. Since all thefunctions such as display RAM, character
generator, and liquid crystal driver, required for driving a dot-matrix liquid crystal display are internally
provided on one chip, a minimal system can be interfaced with this controller/driver.
A single HD44780U can display up to one 8-character line or two 8-character lines.
The HD44780U has pin function compatibility with the HD44780S which allows the userto easily replace
an LCD-II with an HD44780U. The HD44780U character generator ROM is extended to generate 208 5 ´
8 dot character fonts and 32 5 ´ 10 dot character fonts for a total of 240 different character fonts.
The low power supply (2.7V to 5.5V) of the HD44780U is suitable for any portable battery-driven product
requiring low power dissipation.
Features
· 5 ´ 8 and 5 ´ 10 dot matrixpossible
· Low power operation support:
¾ 2.7 to 5.5V
· Wide range of liquid crystal display driver power
¾ 3.0 to 11V
· Liquid crystal drive waveform
¾ A (One line frequency AC waveform)
· Correspond to high speed MPU bus interface
¾ 2 MHz (when VCC = 5V)
· 4-bit or 8-bit MPU interface enabled
· 80 ´ 8-bit display RAM (80 characters max.)
· 9,920-bit character generator ROM fora total of 240 character fonts
¾ 208 character fonts (5 ´ 8 dot)
¾ 32 character fonts (5 ´ 10 dot)
HD44780U
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· 64 ´ 8-bit character generator RAM
¾ 8 character fonts (5 ´ 8 dot)
¾ 4 character fonts (5 ´ 10 dot)
· 16-common ´ 40-segment liquid crystal display driver
· Programmable duty cycles
¾ 1/8 for one line of 5 ´ 8 dots with cursor
¾ 1/11 for one line of 5 ´ 10 dots with cursor¾ 1/16 for two lines of 5 ´ 8 dots with cursor
· Wide range of instruction functions:
¾ Display clear, cursor home, display on/off, cursor on/off, display character blink, cursor shift,
display shift
· Pin function compatibility with HD44780S
· Automatic reset circuit that initializes the controller/driver after power on
· Internal oscillator with external resistors
· Low powerconsumption
Ordering Information
Type No. Package CGROM
HD44780UA00FS
HCD44780UA00
HD44780UA00TF
FP-80B
Chip
TFP-80F
Japanese standard font
HD44780UA02FS
HCD44780UA02
HD44780UA02TF
FP-80B
Chip
TFP-80F
European standard font
HD44780UBxxFS
HCD44780UBxx
HD44780UBxxTF
FP-80B
Chip
TFP-80F
Custom font
Note: xx: ROM code No.
HD44780U
3
HD44780U Block Diagram
Display
data RAM(DDRAM)
80 ´ 8 bits
Character
generator
ROM
(CGROM)
9,920 bits
Character
generator
RAM
(CGRAM)
64 bytes
Instruction
register (IR)
Timing
generator
Common
signal
driver
16-bit
shift
register
Segment
signal
driver
40-bit
latch
circuit
40-bit
shift
register
Parallel/serial converter
and
attribute circuit
LCD drive
voltage
selector
Address
counter
MPU
interfaceInput/
output
buffer
Data
register
(DR)
Cursor
and
blink
controller
CPG
CL1
CL2
M
D
RS
R/W
DB4 to
DB7
E
Instruction
decoder
OSC1 OSC2
COM1 to
COM16
SEG1 to
SEG40
8
8 8
7
40
5 5
7
8
7
8
7
VCC
GND
V1 V2 V3 V4 V5
DB0 to
DB3
Reset
circuit
ACL
8
Busy
flag
HD44780U
4
HD44780U Pin Arrangement (FP-80B)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
1617
18
19
20
21
22
23
24
80
79
78
77
76
75
74
73
72
71
70
69
68
67
66
65
64
63
62
61
60
59
58
57
56
55
54
53
52
51
50
49
48
47
46
45
44
43
42
41
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
FP-80B
(Top view)
SEG39
SEG40
COM16
COM15
COM14
COM13
COM12
COM11
COM10
COM9
COM8
COM7
COM6
COM5
COM4
COM3
COM2
COM1
DB7...
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