PT6553_10 Datasheet, PDF (27/41 Pages) Princeton Technology Corp – LCD Driver IC with Key Input Function

LCD Driver IC with Key Input Function
Interrupt - Based Key Data Acquisition Timing Diagram
Key input
Key on
Key on
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Fax: [phone]
URL: http://www.princeton.com.tw
PT6553
Key scan
t3
t3
t4
t3
CE
t6
t6
t6
t6
DI
t5 _{Key data read}
t5
t5
t5
DO
Key data read request
t8
t8
t8
t8
Controller determination
Controller determination
Controller determination
(key on)
Controller determination ^{(key on)}
Controller determination
(key on)
Controller determination
(key off)
(key on)
(key off)
Notes:
1. t3 = Key Scan Execution Time when after two key scan operations, the key data match (615T (s))
2. t4 = Key Scan Execution Time when after two key scan operations, the key data do not match and
the key scan operation was once again performed. (1230T (s)).
3. T = 1/fosc
4. t5 = Key Address (43H) Transfer Time
5. t6 = Key Data Read Time
PT6553 V1.7
- 27 -
November, 2007