pt6584 Princeton Technology Corp., pt6584 Datasheet - Page 18

• Manufacturer Part Number: pt6584
• Description: Lcd Driver Ic - Princeton Technology Corp
• Manufacturer: Princeton Technology Corp.

LCD Driver IC
IN SLEEP MODE
PT6584 V1.1
Key Input 2
Key Input 1
x The pins KS1 to KS6 are set to high or low by the S0 and S1 bits in the control data. (See the
x If a key on one of the lines corresponding to a KS1 to KS6 pin which is set high is pressed, the
x If a key is pressed for longer than 800T(s)(Where T=
x After the controller reads the key data, the key data read request is cleared (DO is set high) and the
x Sleep mode key scan example
Key scan
control data description for details.)
oscillator on the OSC pin is started and a key scan is performed. Keys are scanned until all keys
are released. Multiple key presses are recognized by determining whether multiple key data bits
are set.
request (a low level on DO) to the controller. The controller acknowledges this request and reads
the key data. However, if CE is high during a serial data transfer, DO will be set high.
PT6584 performs another key scan. However, this does not clear sleep mode. Also note that DO,
being an open-drain output, requires a pull-up resistor (between 1 and 10K ).
DO
CE
DI
Se rial da ta tra nsfe r
80 0T[s]
Ke y da ta r ead re que st
Se rial da ta tra nsfe r
Ke y ad dre ss (43 H)
Ke y da ta r ead
- 18 -
80 0T[s]
Se rial da ta tra nsfe r
Ke y da ta r ead re que st
fosc
1
) the PT6584 outputs a key data read
Ke y da ta r ead
Ke y ad dre ss
80 0T[s]
URL:http://www.princeton.com.tw
Ke y da ta r ead re que st
Fax:[phone]
Ke y da ta r ead
Tel:[phone]
Ke y ad dre ss
PT6584
August, 2006
T =
fosc
1