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參數(shù)資料
| 型號： | HDSP-253X |
| 英文描述： | Eight Character 5 mm Smart Alphanumeric Display |
| 中文描述： | 八字5毫米智能字符顯示 |
| 文件頁數(shù)： | 7/16頁 |
| 文件大?。?/td> | 417K |
| 代理商： | HDSP-253X |
7
Electrical Description
Pin Function
Description
RESET (RST, pin 1)
Reset initializes the display.
FLASH (FL, pin 2)
FL low indicates an access to the Flash RAM and is unaffected by the
state of address lines A
3
-A
4
.
Each location in memory has a distinct address. Address inputs (A
0
-A
2
)
select a specific location in the Character RAM, the Flash RAM or a
particular row in the UDC (User-Defined Character) RAM. A
3
-A
4
are
used to select which section of memory is accessed. Table 1 shows the
logic levels needed to access each section of memory.
ADDRESS INPUTS
(A
0
-A
4
, pins 3-6, 10)
Table 1. Logic Levels to Access Memory
FL
A
4
A
3
0
X
X
Section of Memory
A
2
A
1
A
0
Character Address
Flash RAM
1
0
0
UDC Address Register
Don’t Care
1
0
1
UDC RAM
Row Address
1
1
0
Control Word Register
Don’t Care
1
1
1
Character RAM
Character Address
CLOCK SELECT
(CLS, pin 11)
This input is used to select either an internal (CLS = 1) or external (CLS = 0)
clock source.
CLOCK INPUT/OUTPUT
(CLK, pin 12)
Outputs the master clock (CLS = 1) or inputs a clock (CLS = 0) for slave
displays.
WRITE (WR, pin 13)
Data is written into the display when the WR input is low and the
CE input is low.
CHIP ENABLE (CE, pin 14)
This input must be at a logic low to read or write data to the display and
must go high between each read and write cycle.
READ (RD, pin 19)
Data is read from the display when the RD input is low and the CE
input is low.
DATA Bus
(D
0
-D
7
, pins 20, 21, 25-30)
GND (SUPPLY) (pin 16)
The Data bus is used to read from or write to the display.
This is the analog ground for the LED drivers.
GND (LOGIC) (pin 18)
This is the digital ground for internal logic.
V
DD
(POWER) (pin 15)
Thermal Test (pin 17)
This is the positive power supply input.
This pin is used to measure the IC junction temperature.
Do not connect.
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