STMPE811_09 datasheet(51/64 Pages) STMICROELECTRONICS

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STMPE811

GPIO controller

Doc ID 14489 Rev 2

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GPIO_ED_STA

GPIO edge detect status

Address:

0x14

Type:

R/W

Reset:

0x00

Description:

GPIO edge detect status register. An edge transition has been detected.

GPIO_RE

Rising edge register

Address:

0x15

Type:

R/W

Reset:

0x00

Description:

GPIO rising edge detection enable register.

Setting this bit to ‘1’ would enable the detection of the rising edge transition.

The detection would be reflected in the GPIO edge detect status register.

GPIO_FE

Falling edge detection enable register

Address:

0x16

Type:

R/W

Reset:

0x00

Description:

Setting this bit to ‘1’ would enable the detection of the falling edge transition.

The detection would be reflected in the GPIO edge detect status register.

GPIO_ALT_FUNCT

Alternate function register

Address:

0x17

Type:

R/W

Reset:

0x0F

Description:

Alternate function register. "‘0’ sets the corresponding pin to function as touch

screen/ADC, and ‘1’ sets it into GPIO mode.

13.0.1

Power supply

The STMPE811 GPIO operates from a separate supply pin (VIO). This dedicated supply pin

provides a level-shifting feature to the STMPE811. The GPIO remains valid until VIO is

removed.

The host system may choose to turn off Vcc supply while keeping VIO supplied. However it is

not allowed to turn off supply to VIO, while keeping the Vcc supplied.

The touch screen is always powered by VIO. For better resolution and noise immunity, VIO

above 2.8 V is advised.

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