LC75742W View Datasheet(PDF) - SANYO -> Panasonic
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LC75742W Datasheet PDF : 18 Pages
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LC75742E, LC75742W
Notes on Controller Transfer of Display Data
Since the display data (D1 to D82) is transferred in two operations as shown in figure 2, we strongly recommend that
applications transfer all the data within a 30 ms period to assure display quality.
Controller Key Data Readout Procedure
When the controller uses a timer to read out the key data
• Flowchart
• Timing chart
Controller
determination
(Key on)
Controller
determination
(Key on)
Controller
determination
(Key off)
Controller
determination
(Key on)
Controller
determination
(Key off)
t5.........Key scan execution time (25600T [s]) when the key data for two key scan operations matches.
t6 ........Key scan execution time (51200T [s]) when the key data for the first two key scan operations
............does not match.
t7.........Key address (8FH) transfer time
t8.........Key data readout time
T = 1 [s]
fOSC
• Operation
When the controller use timer processing for key on/off determination and key data readout, it must set CE low and
check the state of DO at least once every t9 period. If DO is low, the controller must recognize that a key has been
pressed and read out the key data.
The period t9 must obey the following inequality:
t9 > t7 + t8 + t6
Note that if the controller reads out key data when DO is high, both the key data (KD1 to KD30) and the sleep
acknowledge data will be invalid data.
No. 6142-16/18
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