WM8993 datasheet(99/229 Pages) WOLFSON

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Production Data

WM8993

PD, November 2010, Rev 4.0

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

3:0

GPIO1_SEL

[3:0]

0000

GPIO1 function select

0000 = GPIO input

0001 = OPCLK

0010 = Logic 0

0011 = Logic 1

0100 = FLL_LOCK

0101 = TEMPOK

0110 = Reserved

0111 = IRQ

1000 = MICBIAS1 current detect

1001 = MICBIAS1 short circuit detect

1010 = MICBIAS2 current detect

1011 = MICBIAS short circuit detect

11XX = Reserved

R20 (14h)

IRQ_DEBOU

NCE

GPIO1_DB

GPIO1 input de-bounce

0 = disabled

1 = enabled

R22 (16h)

GPIOCTRL2

IM_GPIO1_

EINT

GPIO1 interrupt mask

0 = do not mask interrupt

1 = mask interrupt

R23 (17h)

GPIO_POL

GPIO1_POL

GPIO1 interrupt polarity

0 = active high

1 = active low

Table 64 GPIO1 Configuration and Interrupt Control

BUTTON DETECT

The analogue input pins IN2LN and IN2RN support alternate functions as general purpose digital

inputs GPI7 and GPI8 respectively. These digital signals are inputs to the Interrupt function, with

selectable de-bounce and polarity control. The associated interrupt bits are latched once set and can

be polled at any time or used as inputs to the IRQ output. See “Interrupts” for more details of the

Interrupt event handling.

Note that button detect functionality can also be implemented on the GPIO1 pin, as described earlier.

The interrupt bits are latched once set; they are reset by writing a logic ‘1’ to the _EINT register bits

in Register R18 (12h). De-bouncing is provided in order to avoid false event triggers. Note that

TOCLK must be enabled when this input de-bouncing is required.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R18 (12h)

GPIO CTRL

GPI8_EINT

GPI8 interrupt

0 = interrupt not set

1 = interrupt is set

Cleared when a ‘1’ is written

GPI7_EINT

GPI7 interrupt

0 = interrupt not set

1 = interrupt is set

Cleared when a ‘1’ is written

R20 (14h)

IRQ_DEBOU

NCE

GPI8_DB

GPI8 input de-bounce

0 = disabled

1 = enabled

GPI7_DB

GPI7 input de-bounce

0 = disabled

1 = enabled

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