WM8952ECSSLASHRV datasheet(50/72 Pages) WOLFSON

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WM8952

Pre Production

PP, Rev 3.1, June 2011

Figure 27 Example Usage of MODE Pin to Generate a Clock Out in 3-wire Mode

This example shows how the MODE_GPIO register bit interfaces to the MODE pad in the case there

MODE is used as a GPIO output. When MODE_GPIO is set, the internal version of MODE is

overridden to high and the MODE pin output driver is enabled. The pull up, which is used to default

3-wire mode at start-up, is disabled as a power saving measure. MODE_GPIO cannot be set in 2-

wire mode - this would prevent correct operation of the control interface. Internal timing is arranged

to ensure that the override is in place before the pull-up is disabled.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

GPIO

Control

MODE_GPIO

Selects MODE pin as a GPIO pin

0 = MODE is an input. MODE selects 2-

wire mode when low and 3-wire mode

when high.

1 = MODE can be an input or output

under the control of the GPIO control

mode regardless of what happens on the

MODE pin.

Table 40 Mode is GPIO Control

Auto-incremental writes are supported in 2 wire and 3 wire modes. This is enabled by default.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

Control

Interface

AUTOINC

Auto-Incremental write enable

0=Auto-Incremental writes disabled

1=Auto-Incremental writes enabled

Table 41 Control Interface

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