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參數(shù)資料
| 型號(hào)： | IPD2548A |
| 元件分類(lèi)： | 顯示用LED |
| 英文描述： | 5X7 DOT MATRIX DISPLAY, YELLOW, 6.4 mm |
| 封裝： | ROHS COMPLIANT, HERMETIC SEALED, CERAMIC PACKAGE-20 |
| 文件頁(yè)數(shù)： | 11/12頁(yè) |
| 文件大?。?/td> | 869K |
| 代理商： | IPD2548A |
IPD2545A, IPD2547A, IPD2548A
2006-03-03
8
Programming the IPD2545/7/8A
There are five registers within the IPD2545/7/8A display. Four of
these registers are used to hold the ASCII/attribute code of the
four display characters. The fifth register is the Control Word,
which is used to blink, blank, clear, or dim the entire display, or to
change the presentation (attributes) of individual characters.
Addressing
The addresses within the display device are shown below. Digit 0
is the rightmost digit of the display, while Digit 3 is on the left.
Although there is only one Control Word, it is duplicated at the four
address locations 0-3. Data can be read from any of these loca-
tions. When one of these locations is written to, all of them will
change together.
Bit D7 of any of the display digit locations is used to allow an
attribute to be assigned to that digit. The attributes are discussed
in the next section. If Bit D7 is set to a one, that character will be
displayed using the attribute. If bit D7 is cleared, the character will
display normally.
Control Word Format
Control Word
When address bit A2 is taken low, the Control Word is accessed.
The same Control Word appears in all four of the lower address
spaces of the display. Through the Control Word, the display can
be cleared, the lamps can be tested, display brightness can be
selected, and attributes can be set for any characters which have
been loaded with their most significant bit (D7) set high.
Brightness (D0, D1): The state of the lower two bits of the Control
Word are used to set the brightness of the entire display, from 0%
to 100%. The table below shows the correspondence of these bits
to the brightness.
Attributes (D2–D4): Bits D2, D3, and D4 control the visual
attributes (i.e., blinking, alternate) of those display digits which
have been written with bit D7 set high. In order to use any of the
four attributes, the Cursor Enable bit (D4 in the Control Word) must
be set. When the Cursor Enable bit is set, and bit D7 in a character
location is set, the character will take on one of the following dis-
play attributes.
Address
Contents
A2
A1
A0
0
X
Control Word
1
0
Digit 0 (rightmost)
1
0
1
Digit 1
1
0
Digit 2
1
Digit 3 (leftmost)
D7
D6
D5
D4
D3
D2
D1
D0
Operation
0
X
0
Blank
0
X
0
1
25% brightness
0
X
1
0
50% brightness
0
X
1
Full brightness
X=don’t care
IDCW5163
Enable
Attribute
Blink
Test
Lamp
Clear
Attributes
Brightness
D7
D6
D5
D4
D3
D2
D1
D0
D1 D0 Brightness
0% (blank)
00
25%
01
1
50%
0
1
100%
1
Attributes
Display cursor instead
1
0
D3
0
Display blinking cursor
of character
Blink character
0
1
D2
instead of character
1
with cursor
Alternate character
1
Disable above attributes
Attribute Enable
D4
0
Enable above attributes
1
Blink entire display
Blink attribute disabled
Blink
D5
1
0
Standard operation
1
D6
0
Display all dots at 50% brightness
Lamp Test
Clear entire display
Standard operation
0
1
Clear
D7
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