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部品番号
コンポーネント説明
LC75857E データシートの表示(PDF) - ON Semiconductor
部品番号
コンポーネント説明
メーカー
LC75857E
1/3, 1/4 Duty LCD Driver with Key Input Function
ON Semiconductor
LC75857E Datasheet PDF : 39 Pages
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2. Interrupt based key data acquisition
(1) Flowchart
LC75857E, LC75857W
CE = [L]
DO = [L]
NO
YES
Key data read
processing
Wait for at
least t10
CE = [L]
NO
DO = [H]
YES
Key OFF
(2) Timing chart
Key input
Key on
Key on
Key scan
CE
DI
DO
t5
t5
t6
t5
t8
Key address
t7
Key data read
t8
t7
Key data read request
Controller
determination
(Key on)
t10
Controller
determination
(Key off)
Controller
determination
(Key on)
t8
t7
t10
Controller
determination
(Key on)
t8
t7
t10
Controller
determination
(Key on)
t10
Controller
determination
(Key off)
t5: Key scan execution time when the key data agreed for two key scans. (615T(s))
t6: Key scan execution time when the key data did not agree for two key scans and the key scan was executed again. (1230T(s))
t7: Key address (43H) transfer time
t8: Key data read time
1
1
T =——— = ——
fosc f
CK
No. 7980-38/39
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