CFA633-RDI-KS datasheet(59/88 Pages) CRYSTAIFONTZ

59 / 88 page

Crystalfontz America, Inc.

Data Sheet Release Date 2012/02/21

www.crystalfontz.com

CFA633-RDI-KS LCD Module (Hardware v2.0 / Firmware s2v1)

February 2012

Page 59

to the resolution of the 32 Hz sampling). This means that the host is not forced to poll quickly in order to detect short

events. The algorithm used by the CFA633 to read the inputs is inherently “bounce-free”.

The GPIOs also have “pull-up” and “pull-down” modes. These modes can be useful when using the GPIO as an input

connected to a switch since no external pull-up or pull-down resistor is needed. For instance, the GPIO can be set to pull

up. Then when a switch connected between the GPIO and ground is open, reading the GPIO will return a "1". When the

switch is closed, the input will return a "0".

Pull-up/pull-down resistance values are approximately 5kΩ. Do not exceed current of 25 mA per GPIO.

The GPIO configuration is one of the items stored by the command 4 (0x04): Store Current State As Boot State (Pg. 39).

type: 0x22 = 3410

data_length:

2 bytes to change value only

3 bytes to change value and configure function and drive mode

data[0]: index of GPIO to modify

0 = GPIO[0] = J8, Pin 7

1 = GPIO[1] = J8, Pin 6 (default is ATX Host Power Sense)

2 = GPIO[2] = J8, Pin 5 (default is ATX Host Power Control)

3 = GPIO[3] = J8, Pin 4 (default is ATX Host Reset Control)

4 = GPIO[4] = J9, Pin 2 (default is DOW I/O--always has 1k

Ω hardware pull-up)

5-255 = reserved

Please note: Future versions of this command on future

hardware models may accept additional values for data[0],

which would control the state of future additional GPIO

pins

(Continues on the next page.)

NOTE ON SETTING AND CONFIGURING GPIO PINS

The GPIO pins may also be used for ATX control through header J8 and temperature sensing through

the CFA633’s DOW header. By factory default, the GPIO output setting, function, and drive mode are

set correctly to enable operation of the ATX and DOW functions.

The GPIO output setting, function,

and drive mode must be set to the correct values in order for the ATX and DOW functions to

work. Improper use of this command can disable the ATX and DOW functions.The 633_WinTest

may be used to easily check and reset the GPIO configuration to the default state so the ATX and DOW

functions will work.

CFA633-RDI-KS датащи(PDF) 59 Page - Crystalfontz America, Inc.