STMPE812 datasheet(39/51 Pages) STMICROELECTRONICS

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STMPE812

GPIO port controller

Doc ID 17732 Rev 3

39/51

GPIO port controller

A total of 4/6 configurable ports are available in the STMPE812 port expander device.

If configured as GPIO input/output, they are controlled by the GPIO registers.

All GPIO registers are named as GPxx, where:

Xxx represents the functional group

The function of each bit is shown in Table 15:

If both GPFE and GPRE are not set, state transition on a GPIO does not cause an interrupt.

On power-up reset, all GPIO are set as input.

Table 14.

GPIO registers

Address

Bit

Type

Reset

Function

0x10

GPIO_SET_PIN

R/W

0x00

Set pin state

0x11

GPIO_CLR_PIN

R/W

0x00

Clear pin state

0x12

GPIO_MP_STA

R/W

0x00

Monitor pin state

0x13

GPIO_DIR

R/W

0x00

Falling edge

detection enable

0x14

GPIO_ED

R/W

0x00

Rising edge

detection enable

Bit

65432

GPxx

IO-3

IO-2

IO-1

IO-0

Table 15.

GPIO registers

Function

GPIO monitor pin state

Reading this bit yields the current state of the bit. Writing has no effect.

GPIO set pin state

Writing ‘1’ to this bit causes the corresponding GPIO to go to ‘1’ state.

Writing ‘0’ to this bit has no effect

Reading this register always yield 0x00

GPIO clear pin state

Writing ‘1’ to this bit causes the corresponding GPIO to go to ‘0’ state.

Writing ‘0’ to this bit has no effect

Reading this register always yield 0x00

GPIO falling edge detection

enable

Writing ‘1’ to this bit allows interrupt generation when there is a falling

edge at the corresponding GPIO

Writing ‘0’ disables the interrupt generation on falling edge detection

GPIO rising edge detection

enable

Writing ‘1’ to this bit allows interrupt generation when there is a rising

edge at the corresponding GPIO

Writing ‘0’ disables the interrupt generation on rising edge detection

Obsolete

Product(s)

- Obsolete

Product(s)

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