WM8580 datasheet(19/97 Pages) WOLFSON

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Production Data

WM8580

PD Rev 4.3 August 2007

With CONTREAD set, a single read-only register can be read back by writing to any other register or

to a dummy register. The register to be read is determined by the READMUX[2:0] bits. When a write

to the device is performed, the device will respond by returning the status byte in the register

selected by the READMUX register bits. This 3-wire interface read back method using a write access

is shown in Figure 7

BIT

LABEL

DEFAULT

DESCRIPTION

2:0

READMUX

[2:0]

000

Determines which status register

is to be read back:

000 = Error Register

001 = Channel Status Register 1

010 = Channel Status Register 2

011 = Channel Status Register 3

100 = Channel Status Register 4

101 = Channel Status Register 5

110 = S/PDIF Status Register

CONTREAD

Continuous Read Enable.

0 = Continuous read-back mode

disabled

1 = Continuous read-back mode

enabled

R52

READBACK

34h

READEN

Read-back mode enable.

0 = read-back mode disabled

1 = read-back mode enabled

Table 9 Read-back Control Register

The 3-wire interface readback protocol is shown below. Note that the SDO pin is tri-state unless CSB

is held low; therefore CSB must be held low for the duration of the read.

Figure 7 3-Wire SPI Compatible Interface Continuous Readback

If CONTREAD is set to zero, the user can read back directly from the register by writing to the

Figure 8 below.

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