STMPE610 datasheet(41/56 Pages) STMICROELECTRONICS

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STMPE610

GPIO controller

Doc ID 15432 Rev 3

41/56

GPIO controller

A total of 6 GPIOs are available in the STMPE610 port expander device. Most of the GPIOs

share physical pins with some alternate functions. The GPIO controller contains the

registers that allow the host system to configure each of the pins into either a GPIO, or one

of the alternate functions. Unused GPIOs should be configured as outputs to minimize

power consumption.

A group of registers are used to control the exact function of each of the 6 GPIOs. The

registers and their respective addresses are listed in the following table.

All GPIO registers are named as GPIO-x, where x represents the functional group.

Table 17.

GPIO control registers

Address

Size

(bit)

Function

0x10

GPIO_SET_PIN

Set pin register

0x11

GPIO_CLR_PIN

Clear pin state

0x12

GPIO_MP_STA

Monitor pin state

0x13

GPIO_DIR

Set pin direction

0x14

GPIO_ED

Edge detect status

0x15

GPIO_RE

Rising edge detection

enable

0x16

GPIO_FE

Falling edge detection

enable

0x17

GPIO_ALT_FUNCT

Alternate function register

543

GPIO-7

GPIO-6

GPIO-5

GPIO-4

GPIO-3

GPIO-2

RESERVED

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