WM8281ECSSLASHR datasheet(230/392 Pages) CIRRUS

230 / 392 page

WM8281

230

Rev 4.0

GPIO FUNCTION SELECT

The available GPIO functions for GPIO pins 1, 2, 3 and 4 are described in Table 87. A subset of these

functions is available for GPIO5, as described in Table 88.

The function of each GPIO is set using the GPn_FN register, where n identifies the GPIO pin (1, 2, 3,

4 or 5). Note that the respective GPn_DIR must also be set according to whether the function is an

input or output.

GPn_FN

DESCRIPTION

COMMENTS

00h

GPIO1 - AIF1TXLRCLK

GPIO2 - AIF2TXLRCLK

GPIO3 - AIF3TXLRCLK

GPIO4 - Reserved

Alternate Audio Interface connections for AIF1, AIF2 and

AIF3

01h

Button detect input / Logic

level output

GPn_DIR = 0: GPIO pin logic level is set by GPn_LVL.

GPn_DIR = 1: Button detect or logic level input.

02h

IRQ1 Output

Interrupt (IRQ1) output

0 = IRQ1 not asserted

1 = IRQ1 asserted

03h

IRQ2 Output

Interrupt (IRQ2) output

0 = IRQ2 not asserted

1 = IRQ2 asserted

04h

OPCLK Clock Output

Configurable clock output derived from SYSCLK

05h

FLL1 Clock

Clock output from FLL1

06h

FLL2 Clock

Clock output from FLL2

08h

PWM1 Output

Configurable Pulse Width Modulation output PWM1

09h

PWM2 Output

Configurable Pulse Width Modulation output PWM2

0Ah

SYSCLK Underclocked

Error

Indicates that an unsupported clocking configuration has

been attempted

0 = Normal

1 = SYSCLK underclocking error

0Bh

ASYNCCLK

Underclocked Error

Indicates that an unsupported clocking configuration has

been attempted

0 = Normal

1 = ASYNCCLK underclocking error

0Ch

FLL1 Lock

Indicates FLL1 Lock status

0 = Not locked

1 = Locked

0Dh

FLL2 Lock

Indicates FLL2 Lock status

0 = Not locked

1 = Locked

0Fh

FLL1 Clock OK

Indicates FLL1 Clock OK status

0 = FLL1 Clock output is not active

1 = FLL1 Clock output is active

10h

FLL2 Clock OK

Indicates FLL2 Clock OK status

0 = FLL2 Clock output is not active

1 = FLL2 Clock output is active

12h

Headphone detect

Indicates Headphone Detection status

0 = Headphone Detect not complete

1 = Headphone Detect complete

13h

Microphone detect

Microphone Detect (MICDET accessory) IRQ output

A single 31

s pulse is output whenever an accessory

insertion, removal or impedance change is detected.

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