STMPE2401 datasheet(30/55 Pages) STMICROELECTRONICS

No de pièce	STMPE2401

Description	24-bit Enhanced port expander with Keypad and PWM controller Xpander logic

PDF	55 Pages

Scroll/Zoom	100%

Fabricant	STMICROELECTRONICS [STMicroelectronics]

Site Internet	http://www.st.com

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30 / 55 page

GPIO controller

STMPE2401

30/55

10.2

GPIO alternate function register (GPAFR)

GPAFR is to select the functionality of the GPIO pin. To select a function for a GPIO pin, a

bit-pair in the register (GPAFR_U or GPAFR_L) has to be set.

Function

GPIO Edge Detect Status

Set to ‘1’ by hardware when there is a rising/falling edge on the corre-

sponding GPIO. Writing ‘1’ clears the bit. Writing ‘0’ has no effect.

GPIO Rising Edge

Set to ‘1’ to enable rising edge detection on the corresponding GPIO.

GPIO Falling Edge

Set to ‘1’ to enable falling edge detection on the corresponding GPIO.

GPIO Pull Up

Set to ‘1’ to enable internal pull-up resistor

GPIO Pull Down

Set to ‘1’ to enable internal pull-down resistor

Table 28. Bit’s function

GPAFR_U_msb

Bit

22212019181716

AF23

AF22

AF21

AF20

R/W

RWRWRW

Reset

Value

000

GPAFR_U_csb

Bit

1413121110

AF19

AF18

AF17

AF16

R/W

RWRWRW

Reset

Value

000

GPAFR_U_lsb

Bit

432

AF15

AF14

AF13

AF12

R/W

RWRWRW

Reset

Value

000

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