WM8953ECSSLASHRV datasheet(43/100 Pages) WOLFSON

43 / 100 page

Production Data

WM8953

PD, January 2009, Rev 4.0

The following table describes the coding of the fields listed in Table 21.

ADDRESS

LABEL

DEFAULT

DESCRIPTION

GPIOn_DEB_ENA

(n = 3, 4, 5, 7, 8)

De-Bounce

0 = disabled (Not de-bounced)

1 = enabled (Requires MCLK input and

TOCLK_ENA = 1)

GPIOn_IRQ_ENA

(n = 3, 4, 5, 7, 8)

IRQ Enable

0 = disabled

1 = enabled

GPIOn_PU

(n = 3, 4, 5)

GPIO Pull-Up Resistor Enable

0 = Pull-up disabled

1 = Pull-up enabled (Approx 150k

Ω)

GPIOn_PD

(n = 3, 4, 5)

See

Table 21

GPIO Pull-Down Resistor Enable

0 = Pull-down disabled

1 = Pull-down enabled (Approx 150k

Ω)

GPIOn_SEL[3:0]

(n = 3, 4, 5)

0000b

GPIOn Pin Function Select

0000 = Input pin

0001 = Clock output (SYSCLK/OPCLKDIV)

0010 = Logic '0'

0011 = Logic '1'

0100 = PLL Lock output

0101 = Temperature OK output

0110 = SDOUT data output

0111 = IRQ output

1000 = MIC Detect

1001 = MIC Short Circuit Detect

1010 to 1111 = Reserved

Registers

R20 (14h)

R21 (15h)

(See Table

21)

GPIn_ENA

(n = 7, 8)

GPIn Input Pin Enable

0 = pin disabled as GPIn input

1 = pin enabled as GPIn input

Table 22 GPIO Function Control Bits

The polarity of GPIO/GPI inputs may be configured using the GPIO_POL register bits. This is

described in Table 23.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R23 (17h)

7:0

GPIO_POL

[7:0]

(rw)

00h

GPIOn Input Polarity

0 = Non-inverted

1 = Inverted

GPIO_POL[7] = GPI8 polarity

GPIO_POL[6] = GPI7 polarity

GPIO_POL[5] = Reserved

GPIO_POL[4] = GPIO5 polarity

GPIO_POL[3] = GPIO4 polarity

GPIO_POL[2] = GPIO3 polarity

GPIO_POL[1] = Reserved

GPIO_POL[0] = Reserved

Table 23 GPIO Polarity

Each of the available GPIO functions is described in turn in the following sections.

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