WM8321 datasheet(44/253 Pages) WOLFSON

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WM8321

Production Data

PD, February 2012, Rev 4.0

It is recommended to re-lock the protected registers immediately after writing to them. This helps

protect the system against accidental overwriting of register values. To lock the protected registers, a

value of 0000h should be written to the Security register.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R16392 (4008h)

Security Key

15:0

SECURITY

[15:0]

0000h

Security Key

A value of 9716h must be written

to this register to access the user-

keyed registers.

Table 13 Security Key Registers

12.5 SOFTWARE RESET AND CHIP ID

A Software Reset can be commanded by writing to Register 0000h. This is a read-only register field

and the contents of this register will not be affected by a write operation. For more details of the

different reset types, see Section 24.

Note that a maximum of 6 Software Resets is permitted. If more than 6 Software Resets are

scheduled, the WM8321 will remain in the OFF state until the next valid ON state transition event

occurs.

The Chip ID can be read back from Register 0000h. Other ID fields can be read from the registers

defined in Table 14.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R0 (0000h)

Reset/ID

15:0

CHIP_ID

[15:0]

0000h

Writing to this register causes a

Software Reset. The register map

contents may be reset, depending

on SW_RESET_CFG.

Reading from this register will

indicate Chip ID.

R1 (0001h)

Revision

15:8

PARENT_RE

V [7:0]

00h

The revision number of the parent

die

7:0

CHILD_REV

[7:0]

00h

The revision number of the child

die (when present)

R16384 (4000h)

Parent ID

15:0

PARENT_ID

[15:0]

6246h

The ID of the parent die

Table 14 Reading Device Information

12.6 SOFTWARE SCRATCH REGISTER

The WM8321 provides one 16-bit register as a “Software Scratch” register. This is available for use

by the host processor to store data for any purpose required by the application.

The contents of the Software Scratch register are retained in the BACKUP power state.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R16393 (4009h)

Software Scratch

15:0

SW_SCRATC

H [15:0]

0000h

Software Scratch Register for use

by the host processor.

Note that this register’s contents

are retained in the BACKUP power

state.

Table 15 Software Scratch Register

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