WM8953ECSSLASHRV datasheet(51/100 Pages) WOLFSON

Il numero della parte	WM8953ECS/RV

Spiegazioni elettronici	Low Power Stereo ADC with PLL and TDM Interface

PDF	100 Pages

Scroll/Zoom	100%

Produttore elettronici	WOLFSON [Wolfson Microelectronics plc]

Homepage	http://www.wolfsonmicro.com

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51 / 100 page

Production Data

WM8953

PD, January 2009, Rev 4.0

SERIAL DATA OUTPUT (REGISTER READBACK)

The GPIO pins can be configured to output serial data during register readback in 3-wire (open-drain)

or 4-wire mode. The readback mode is configured using the register bits RD_3W_ENA and

MODE_3W4W as described in Table 31.

Setting the RD_3W_ENA bit to 1 enables 3-wire readback using the SDIN pin in open-drain mode.

Setting the RD_3W_ENA bit to 0 requires the use of a GPIO pin as SDOUT. To enable SDOUT on a

GPIO pin, the following register settings are required:

•

AIF_TRIS = 0

•

GPIOn_SEL = 0110 for the selected SDOUT output pin

•

GPIOn_PU = 0 for the selected SDOUT output pin

•

GPIOn_PD = 0 for the selected SDOUT output pin

The register fields used to configure SDOUT on the GPIO pins are described in Table 31. Refer to

“Control Interface” for more details of 3-wire and 4-wire interfacing.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

RD_3W_ENA

3- / 4-wire readback configuration

1 = 3-wire mode

0 = 4-wire mode, using GPIO pin

R22 (16h)

MODE_3W4W

3-wire mode

0 = push 0/1

1 = open-drain

4-wire mode

0 = push 0/1

1 = wired-OR

Table 31 GPIO 3-Wire Readback Enable

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