Tel:886-2-66296288
Fax:886-2-29174598
URL:http://www.princeton.com.tw
LCD Driver IC
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 on
Key on
Key Input
Key Scan
t6
t5
t5
t5
CE
DI
t8
t8
t8
t7
t7
t7
Key data read
DO
Key data read request
t9
t9
t9
t9
Controller determination
(key on)
Controller determination
(key on)
Controller determination
(key off)
Controller determination
(key on)
Controller determination
(key off)
t5
t6
: Key scan execution time when the key data agreed for two key scans. (800T(s))
: 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
t8
1
: Key address (43H) transfer time T =
fosc
: Key data read time
PT6584 V1.1
- 26 -
August, 2006
PTC [ PRINCETON TECHNOLOGY CORP ]
