STMPE321 datasheet(22/40 Pages) STMICROELECTRONICS

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GPIO controller

STMPE321

22/40

Doc ID 15791 Rev 3

GPIO controller

A total of 3 GPIOs are available in the STMPE321. The GPIO controller contains the

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

input. Unused GPIOs should be configured as outputs to minimize power consumption.

A group of registers is used to control the exact function of each of the 3 GPIOs. The

registers and their respective addresses are listed in Table 8.

All GPIO registers are named GPxx, where:

Xxx represents the functional group

For LSB registers:

For MSB registers:

Table 8.

GPIO controller registers summary map

Address

Description

Auto-increment

0x10

GPIO_MR_LSB

GPIO monitor pin state

Yes

0x11

GPIO_MR_MSB

0x12

GPIO_SET_LSB

GPIO set pin state

Yes

0x13

GPIO_SET_MSB

0x14

GPIO_DIR_LSB

GPIO set pin direction

Yes

0x15

GPIO_DIR_MSB

0x16

GPIO_FUNCT_LSB

GPIO function register

Yes

0x17

GPIO_FUNCT_MSB

543

RESERVED

IO-2

IO-1

IO-0

543

RESERVED

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