WM8945ECSSLASHR datasheet(93/169 Pages) WOLFSON

93 / 169 page

Production Data

WM8945

PD, May 2011, Rev 4.1

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

GP3_LVL

GPIO3 level. Write to this bit to set

a GPIO output. Read from this bit to

read GPIO input level.

When GP3_POL is set, the register

contains the opposite logic level to

the external pin.

3:0

GP3_FN [3:0]

0000

GPIO3 Pin Function

(see Table 63 for details)

R15 (0Fh)

GPIO4

Control

GP4_DIR

GPIO4 Pin Direction

0 = Output

1 = Input

14:13

GP4_PULL [1:0]

GPIO4 pull-up / pull-down Enable

00 = no pull-up or pull-down

01 = pull-down

10 = pull-up

11 = reserved

GP4_INT_

MODE

GPIO4 Interrupt Mode

0 = GPIO interrupt is rising edge

triggered (if GP4_POL=0) or falling

edge triggered (if GP4_POL =1)

1 = GPIO interrupt is triggered on

rising and falling edges

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 63 for details)

Table 62 GPIO Control

GPIO FUNCTION SELECT

The available GPIO functions are described in Table 63. 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.

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