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HD44780 Datasheet(PDF) 10 Page - Hitachi Semiconductor

Part No. HD44780
Description  Dot Matrix Liquid Crystal Display Controller/Driver
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Maker  HITACHI [Hitachi Semiconductor]
Homepage  http://www.renesas.com/eng
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 10 page
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HD44780U
10
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 (A
DD) 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.
AC6 AC5 AC4 AC3 AC2 AC1 AC0
1
0
01
11
0
AC
(hexadecimal)
Example: DDRAM address 4E
High order
bits
Low order
bits
Figure 1 DDRAM Address
00
01
02
03
04
4E 4F
DDRAM
address
(hexadecimal)
Display position
(digit)
12
3
4
5
79
80
. . . . . . . . . . . . . . . . . .
Figure 2 1-Line Display
DDRAM
address
Display
position
1234
5
678
00 01 02 03 04 05 06 07
For
shift left
For
shift right
00 01 02 03 04 05 06
01 02 03 04 05 06 07 08
4F
Figure 3 1-Line by 8-Character Display Example




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