WM8948ECSSLASHR datasheet(100/189 Pages) WOLFSON

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WM8948

Production Data

PD, May 2011, Rev 4.1

100

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

GP4_POL

GPIO4 Polarity Select

0 = Non-inverted

1 = Inverted

GP4_LVL

GPIO4 level. Write to this bit to set

a GPIO output. Read from this bit to

read GPIO input level.

When GP4_POL is set, the register

contains the opposite logic level to

the external pin.

3:0

GP4_FN [3:0]

0000

GPIO4 Pin Function

(see Table 64 for details)

Table 63 GPIO Control

GPIO FUNCTION SELECT

The available GPIO functions are described in Table 64. 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

Pen Down output

Indicates Touch Panel Pen Down detection.

This flag is asserted whenever the Pen is in contact

with the Touch Panel.

0101

Touch Panel

measurement complete

Indicates a set of Touch Panel measurements has

been completed.

This function provides a pulse when new Touch

Panel measurement data is ready. The pulse duration

is approximately 1.95

μs.

0110

Auxiliary ADC

measurement complete

Indicates a new Auxiliary ADC measurement has

been completed.

This function provides a pulse when new AUXADC

measurement data is ready. The pulse duration is

approximately 1.95

μs.

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

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