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EN6370B Datasheet(PDF) 36 Page - Sanyo Semicon Device

Part No. EN6370B
Description  LCD Display Driver with Key Input Function
Download  38 Pages
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Manufacturer  SANYO [Sanyo Semicon Device]
Direct Link  https://www.sanyo-av.com/us/
Logo SANYO - Sanyo Semicon Device

EN6370B Datasheet(HTML) 36 Page - Sanyo Semicon Device

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LC75808W
No.6370-36/38
Notes on the Controller Key Data Read Techniques
1. Timer based key data acquisition
• Flowchart
• Timing chart
• 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.
CE=[L]
Key data
read processing
DO=[L]
NO
YES
A12928
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
1
fOSC
T=
t9
t9
t9
t9
t6
t5
t8
t7
t7
t7
t8
t8
t5
t5
Key on
Key on
Key input
CE
DI
DO
Key scan
Key
address
Key data read
Key data read request
Controller
detemination
(Key on)
Controller
detemination
(Key on)
Controller
detemination
(Key on)
Controller
detemination
(Key off)
Controller
detemination
(Key off)
A12929


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