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PDF HCD44780UA02 Data sheet ( Hoja de datos )
| Número de pieza | HCD44780UA02 | |
| Descripción | Dot Matrix Liquid Crystal Display Controller/Driver | |
| Fabricantes | Hitachi Semiconductor | |
| Logotipo |  |
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HD44780U (LCD-II)
(Dot Matrix Liquid Crystal Display Controller/Driver)
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 the functions 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 user to 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 matrix possible
• Low power operation support:
2.7 to 5.5V
• Wide range of liquid crystal display driver power
3.0 to 11V
• Liquid crystal drive waveform
A (One line frequency AC waveform)
• Correspond to high speed MPU bus interface
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 for a total of 240 character fonts
208 character fonts (5 × 8 dot)
32 character fonts (5 × 10 dot)
167
1 page  
HD44780U Pin Arrangement (FP-80B)
HD44780U
SEG22 1
SEG21 2
SEG20 3
SEG19 4
SEG18 5
SEG17 6
SEG16 7
SEG15 8
SEG14 9
SEG13 10
SEG12 11
SEG11 12
SEG10 13
SEG9 14
SEG8 15
SEG7 16
SEG6 17
SEG5 18
SEG4 19
SEG3 20
SEG2 21
SEG1 22
GND 23
OSC1 24
FP-80B
(Top view)
64 SEG39
63 SEG40
62 COM16
61 COM15
60 COM14
59 COM13
58 COM12
57 COM11
56 COM10
55 COM9
54 COM8
53 COM7
52 COM6
51 COM5
50 COM4
49 COM3
48 COM2
47 COM1
46 DB7
45 DB6
44 DB5
43 DB4
42 DB3
41 DB2
171
5 Page 
HD44780U
Display Data RAM (DDRAM)
Display data RAM (DDRAM) stores display data represented in 8-bit character codes. Its extended
capacity is 80 × 8 bits, or 80 characters. The area in display data RAM (DDRAM) that is not used for
display can be used as general data RAM. See Figure 1 for the relationships between DDRAM addresses
and positions on the liquid crystal display.
The DDRAM address (ADD) is set in the address counter (AC) as hexadecimal.
• 1-line display (N = 0) (Figure 2)
When there are fewer than 80 display characters, the display begins at the head position. For
example, if using only the HD44780, 8 characters are displayed. See Figure 3.
When the display shift operation is performed, the DDRAM address shifts. See Figure 3.
High order
bits
Low order
bits
AC
(hexadecimal) AC6 AC5 AC4 AC3 AC2 AC1 AC0
Example: DDRAM address 4E
100 11 10
Figure 1 DDRAM Address
Display position
(digit)
12 3
DDRAM
address
00 01 02
(hexadecimal)
45
03 04 . . . . . . . . . . . . . . . . . .
79 80
4E 4F
Figure 2 1-Line Display
Display
position 1 2 3 4 5 6 7 8
DDRAM 00 01 02 03 04 05 06 07
address
For
shift left 01 02 03 04 05 06 07 08
For
shift right
4F
00
01
02
03
04
05
06
Figure 3 1-Line by 8-Character Display Example
177
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet HCD44780UA02.PDF ] | |
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