PT6584 Datasheet, PDF (26/42 Pages) Princeton Technology Corp – LCD Driver IC

LCD Driver IC
Tel:[phone]
Fax:[phone]
URL:http://www.princeton.com.tw
PT6584
NOTE ON THE CONTROLLER KEY DATA READ TECHNIQUES
TIMER BASED KEY DATA ACQUISITION
• Flowchart
CE=L
NO
DO=L
YES
Key data read
processing
• Timing Chart
Key Input
Key on
Key on
Key S can
t5
t6
t5
CE
t8
t8
DI
DO
t7
t7
Ke y d ata rea d
t5
t8
t7
Ke y d ata rea d requ est
t9
t9
t9
t9
Co ntrolle r d ete rmina tion Co ntr olle r d ete r mina tion
(key on )
(key on )
Co ntrolle r d ete rmina tion
(key off )
Co ntrolle r d ete rmina tion Co ntr olle r d ete r mina tion
(key on )
(key off )
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 T =} 1
fosc
t8 : Key data read time
PT6584 V1.1
- 26 -
August, 2006