WM8912 datasheet(76/129 Pages) CIRRUS

76 / 129 page

WM8912

Production Data

PD, Rev 4.1, February 2013

GENERAL PURPOSE INPUT/OUTPUT (GPIO)

The WM8912 provides two multi-function pins which can be configured to provide a number of

different functions. These are digital input/output pins on the DBVDD power domain. The GPIO pins

are:



IRQ/GPIO1



BCLK/GPIO4

Each general purpose I/O pin can be configured to be a GPIO input or configured as one of a number

of output functions. Signal de-bouncing can be selected on GPIO input pins for use with jack/button

detect applications. Table 51 lists the functions that are available on each of the GPIO pins.

GPIO PIN FUNCTION

GPIO PINS

IRQ / GPIO1

BCLK / GPIO4

GPIO input

(including jack/button detect)

Yes

GPIO output

Yes

BCLK

Yes

Interrupt (IRQ)

Yes

FLL Lock output

Yes

FLL Clock output

Yes

Table 51 GPIO Functions

IRQ/GPIO1

The IRQ/GPIO1 pin is configured using the register bits described in Table 52. By default, this pin is

IRQ output with pull-down resistor enabled.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R121 (79h)

GPIO

Control 1

GPIO1_PU

GPIO1 pull-up resistor enable

0 = pull-up disabled

1 = pull-up enabled

GPIO1_PD

GPIO1 pull-down resistor enable

0 = pull-down disabled

1 = pull-down enabled

3:0

GPIO1_SEL [3:0]

0100

GPIO1 Function Select

0000 = GPIO input

0001 = Clock output

(f=SYSCLK/OPCLKDIV)

0010 = Logic '0' output

0011 = Logic '1' output

0100 = IRQ output (default)

0101 = FLL Lock output

0110 = Reserved

0111 = Reserved

1000 = Reserved

1001 = FLL Clock output

1010 to 1111 = Reserved

Table 52 IRQ/GPIO1 Control

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