參數(shù)資料
型號: LC75808W
廠商: Sanyo Electric Co.,Ltd.
英文描述: 1/8 to 1/10 Duty LCD Display Drivers with Key Input Function
中文描述: 1月8日至1月10日當值液晶顯示驅動器與關鍵輸入功能
文件頁數(shù): 37/39頁
文件大?。?/td> 981K
代理商: LC75808W
No. 6370 -37/39
LC75808E, 75808W
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. (800T(s))
t6: Key scan execution time when the key data did not agree for two key scans and the key scan was executed again.
(1600T(s))
t7: Key address (43H) transfer time
t8: Key data read time
fosc
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
CE = [ L ]
DO = [ L ]
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