PT6530 Datasheet, PDF (37/42 Pages) Princeton Technology Corp – LCD Driver IC

PT6530
EXPLANATION
In this technique, the controller uses interrupts to determine key on/off states and read the key data. The controller must
check the DO state when CE is low. If DO is low, the controller recognizes that a key has been pressed and executes the
key data read operation. After that the next key on/off determination is performed after the time t10 has elapsed by
checking the DO state when CE is low and reading the key data. The period t10 in this technique must satisfy the
following condition.
t10 > t6
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.
V1.3
37
June 2010