LC75852 데이터 시트보기 (PDF) - SANYO -> Panasonic

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LC75852

Asynchronous Silicon Gate 1/2 Duty LCD Driver with On-Chip Key Input Function

SANYO -> Panasonic 

LC75852E, 75852W

Notes on Controller Key Data Read Techniques

1. Controller key data reading under timer control

• Flowchart

• Timing Chart

t3 ..................Key scan execution time (800T [s]) when the key scan data for two key scans agrees

t4 ..................Key scan execution time (1600T [s]) when the key scan data for two key scans does not agree and a key scan is executed again

t5 ..................Key address (43H) transfer time

t6 ..................Key data read time

1

T = fOSC

• Description

When determining key on/off and reading key data, the controller must confirm the state of DO output when CE is

low for each period t7. When DO is low, the controller recognizes that a key has been pressed and reads the key

data.

During this operation t7 must obey the following condition:

t7 > t5 + t6 + t4

If key data is read when DO is high, the key data (KD1 to KD30) and the sleep acknowledge data (SA) will be

invalid.

No. 4828-14/16

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