WM8946ECSSLASHR datasheet(93/175 Pages) WOLFSON

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Production Data

WM8946

PD, July 2012, Rev 4.3

GPIO FUNCTION SELECT

The available GPIO functions are described in Table 60. The function of each GPIO is set using the

GPn_FN register, where n identifies the GPIO pin (1 to 4).

Note that the polarity of the GPIO inputs and outputs may be selected using the GPn_POL register

bits. When GPn_POL = 1, then the polarity is inverted with respect to the descriptions below.

The GPIO input functions may be used to detect headphone jack insertion or a button press. These

signals may be used as inputs to the Interrupt Controller, via the integrated de-bounce circuit.

GPn_FN

DESCRIPTION

COMMENTS

0000

Logic level input

External logic level is read from GPn_LVL.

Associated interrupt (when enabled) is level-triggered.

0001

Edge detection input

External logic level is read from GPn_LVL.

Associated interrupt (when enabled) is edge

triggered. Note that TOCLK_ENA must be set.

0010

CLKOUT output

Output clock frequency is set by CLKOUT_DIV.

0011

Interrupt (IRQ) output

Hardware output of all unmasked Interrupts.

0100

Reserved

0101

Reserved

0110

Reserved

0111

Temperature flag output

Indicates the temperature sensor output. This is a

hardware output of the TEMP_STS bit (assuming

GPn_POL = 0).

0 = Normal

1 = Overtemperature

1000

Reserved

1001

DMICCLK output

Output clock for digital microphone interface

1010

Logic level output

Pin logic level is set by GPn_LVL.

1011

LDO_UV output

Indicates the LDO undervoltage status. This is a

hardware output of the LDO_UV_STS bit (assuming

GPn_POL = 0).

0 = Normal

1 = LDO undervoltage

1100

Reserved

1101

Reserved

1110

Reserved

1111

Reserved

Table 60 GPIO Function Select

WM8946ECS/R Datasheet(PDF) 93 Page - Wolfson Microelectronics plc

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