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參數資料
| 型號： | LC75816E |
| 廠商： | Sanyo Electric Co.,Ltd. |
| 英文描述： | 1/8 to 1/10 Duty Dot Matrix LCD Display Controllers/Drivers with Key Input Function |
| 中文描述： | 1月8日至1月10日當值點陣液晶顯示控制器/輸入功能的關鍵驅動 |
| 文件頁數： | 22/43頁 |
| 文件大小： | 572K |
| 代理商： | LC75816E |
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No. 7142-22/43
LC75816E, 75816W
In normal mode
The pins KS1 to KS6 are set to high or low with the "set key scan output port/general-purpose output port state"
instruction.
If a key on one of the lines corresponding to a KS1 to KS6 pin which is set high is pressed, a key scan is started and
the keys are scanned until all keys are released. Multiple key presses are recognized by determining whether multiple
key data bits are set.
If a key is pressed for longer than 4800T(s) (Where T= fosc
low level on DO) to the controller. The controller acknowledges this request and reads the key data. However, if CE
is high during a serial data transfer, DO will be set high.
After the controller reads the key data, the key data read request is cleared (DO is set high) and the LC75816E/W
performs another key scan. Also note that DO, being an open-drain output, requires a pull-up resistor (between 1 and
10 k
).
Key on
4608T[s]
*
19
*
19
*
19
*
19
*
19
*
19
*
19
*
19
*
19
*
19
*
19
1
1
2
2
3
3
4
4
5
5
6
6
KS4
KS5
KS6
KS3
KS2
*
19
KS1
T =
1
fosc
DO
DI
Key address
(43H)
Key address
Key address
CE
Key scan
Key data read request
Serial data
transfer
Serial data
transfer
Serial data
transfer
Key data read
Key data read
Key data read
Key data read request
Key data read request
Key input 2
Key input 1
4800T[s]
4800T[s]
4800T[s]
T=
1
fosc
Note:
*
19. Not that the high/low states of these pins are determined by the "set key scan output port/general-purpose output port state"
instruction,
and that
key scan output signals are not output from pins that are set to low.
Key Scan Operation Functions
Key scan timing
The key scan period is 2304T(s). To reliably determine the on/off state of the keys, the LC75816E/W scans the keys
twice and determines that a key has been pressed when the key data agrees. It outputs a key data read request (a low
level on DO) 4800T(s) after starting a key scan. If the key data dose not agree and a key was pressed at that point, it
scans the keys again. Thus the LC75816E/W cannot detect a key press shorter than 4800T(s).
相關PDF資料 |
PDF描述 |
|---|---|
| LC75817 | 1/8 to 1/10 Duty Dot Matrix LCD Display Controller/Driver with Key Input Function |
| LC75817NE | 1/8 to 1/10 Duty Dot Matrix LCD Display Controllers/Drivers with Key Input Function |
| LC75817NW | 1/8 to 1/10 Duty Dot Matrix LCD Display Controllers/Drivers with Key Input Function |
| LC75821E | LCD Display Drivers |
| LC75822E | LCD Display Drivers |
相關代理商/技術參數 |
參數描述 |
|---|---|
| LC75816W | 制造商:SANYO 制造商全稱:Sanyo Semicon Device 功能描述:1/8 to 1/10 Duty Dot Matrix LCD Display Controllers/Drivers with Key Input Function |
| LC75816W-8722-E | 制造商:ON Semiconductor 功能描述:LCD DISPLAY DRIVER - Trays 制造商:ON Semiconductor 功能描述:FTRAY / LCD DISPLAY DRIVER |
| LC75816WS-8722-E | 制造商:ON Semiconductor 功能描述:LCD DISPLAY DRIVER - Trays 制造商:ON Semiconductor 功能描述:FTRAY / LCD DISPLAY DRIVER |
| LC75817 | 制造商:SANYO 制造商全稱:Sanyo Semicon Device 功能描述:1/8 to 1/10 Duty Dot Matrix LCD Display Controller/Driver with Key Input Function |
| LC75817E | 制造商:SANYO 制造商全稱:Sanyo Semicon Device 功能描述:1/8 to 1/10 Duty Dot Matrix LCD Display Controller/Driver with Key Input Function |
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