wm8350 Wolfson Microelectronics plc, wm8350 Datasheet - Page 44

• Manufacturer Part Number: wm8350
• Description: Wolfson Audioplus? Stereo Codec With Power Management
• Manufacturer: Wolfson Microelectronics plc

WM8350
11.6 REGISTER LOCKING
11.7 SPECIAL REGISTERS
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Certain control fields are protected against accidental overwriting. This includes:
By default, these registers are locked, i.e. writing to them has no effect. However, they can be
unlocked by writing a value of 0013h to Register R219.
R219 (DBh)
Security
Table 4 Locking and Unlocking Protected Registers
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.
It is recommended to contact Wolfson Applications support for guidance on features that are affected
by Register Locking.
11.7.1
A read instruction from register R0 can be used to confirm that the chip is a WM8350.
R0 (00h)
Reset/ID
Table 5 Chip ID
11.7.2
The read-only register R1 provides additional information about the WM8350 device.
R1 (01h)
ID
R2 (02h)
Revision
Table 6 Reading Device Information
ADDRESS
ADDRESS
ADDRESS


Watchdog timer and system control settings in Registers R3, R4, R6 and R12 (03h, 04h,
06h and 0Ch).
Battery charger control fields in Registers R168, R169 and R170 (A8h, A9h and AAh).
CHIP ID
DEVICE INFORMATION
15:0
15:1
11:1
BIT
BIT
7:0
7:0
2
0
BIT
15:
0
SW_RESET/C
HIP_ID [15:0]
CHIP_REV
[3:0]
CONF_STS
[1:0]
CUST_ID [7:0]
MASK_REV
[7:0]
LABEL
LABEL
SECURITY
[15:0]
LABEL
DEFAULT
DEFAULT
DEFAULT
6143h
0000h
The value 0013h needs to be set in this
register to allow write access to the
security locked registers.
Reading this register returns 6143h.
The functional silicon revision - this tracks
changes in functionality which are
separate from ROM mask settings
The state of the configuration pins. This
selects what register defaults should be.
The Chip Revision Number
The ROM mask ID
DESCRIPTION
DESCRIPTION
DESCRIPTION
PD, June 2009, Rev 4.1
Production Data
44