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參數(shù)資料
| 型號： | LC75817NW |
| 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(dāng)值點陣液晶顯示控制器/輸入功能的關(guān)鍵驅(qū)動 |
| 文件頁數(shù)： | 39/43頁 |
| 文件大小： | 829K |
| 代理商： | LC75817NW |
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No. 6144-39/43
LC75817E, 75817W
Notes on the controller key data read techniques
1. Timer based key data acquisition
Flowchart
Timing chart
t5: Key scan execution time when the key data agreed for two key scans. (4800T(s))
t6: Key scan execution time when the key data did not agree for two key scans and the key scan was executed again. (9600T(s))
t7: Key address (43H) transfer time
t8: Key data read time
Explanation
In this technique, the controller uses a timer to determine key on/off states and read the key data. The controller must
check the DO state when CE is low every t9 period without fail. If DO is low, the controller recognizes that a key has
been pressed and executes the key data read operation.
The period t9 in this technique must satisfy the following condition.
t9>t6+t7+t8
If a key data read operation is executed when DO is high, the read key data (KD1 to KD30) and sleep acknowledge
data (SA) will be invalid.
T = —1
fosc
CE = L
DO = L
Key data read
processing
NO
YES
Key input
Key scan
CE
DI
DO
Key on
Key on
t5
t6
t5
t5
t8
t7
t7
t7
t8
t8
t9
t9
t9
t9
Key address
Key data read
Key data read request
Controller
determination
(Key on)
Controller
determination
(Key on)
Controller
determination
(Key off)
Controller
determination
(Key on)
Controller
determination
(Key off)
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| LC75821E | LCD Display Drivers |
| LC75822E | LCD Display Drivers |
| LC75823E | 1/3 Duty General-Purpose LCD Drivers |
| LC75824 | 1/4 Duty General-Purpose LCD Display Driver |
| LC75824W | 1/4 Duty General-Purpose LCD Display Driver |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LC75817W | 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 |
| LC75818PT | 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 |
| LC7581E | 制造商:ONSEMI 制造商全稱:ON Semiconductor 功能描述:1/8 to 1/10 Duty Dot Matrix LCD Display Controllers/Drivers |
| LC7581T | 制造商:ONSEMI 制造商全稱:ON Semiconductor 功能描述:1/8 to 1/10 Duty Dot Matrix LCD Display Controllers/Drivers |
| LC7582 | 制造商:SANYO 制造商全稱:Sanyo Semicon Device 功能描述:LCD Driver |
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