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Fax:886-2-29174598
URL:http://www.princeton.com.tw
LCD Driver IC
PT6584
INTERRUPT BASED KEY DATA ACQUISITION
• FLOWCHART
CE=L
NO
DO=L
YES
Key data read
processing
Wait for at least t10
CE=L
NO
DO=H
YES
Key off
• Timing Chart
Key on
Key on
Key Input
Key Scan
t5
t5
t6
t5
CE
DI
t8
t8
t8
t8
Key address
t7
t7
t7
t7
Key data read
DO
Key data read request
t10
t10
t10
t10
Controller
determination
(key on)
Controller
Controller
determination
(key on)
Controller
Controller
Controller
determination
(key off)
determination
determination
determination
(key off)
(key on)
(key on)
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
- 28 -
August, 2006
PTC [ PRINCETON TECHNOLOGY CORP ]
