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WM8352 Datasheet(PDF) 44 Page - Wolfson Microelectronics plc |
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WM8352 Datasheet(HTML) 44 Page - Wolfson Microelectronics plc |
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44 / 336 page  WM8352 Production Data w PD, February 2011, Rev 4.4 44 11.6 REGISTER LOCKING Certain control fields are protected against accidental overwriting. This includes: 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). 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. ADDRESS BIT LABEL DEFAULT DESCRIPTION R219 (DBh) Security 15: 0 SECURITY [15:0] 0000h The value 0013h needs to be set in this register to allow write access to the security locked registers. 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 SPECIAL REGISTERS 11.7.1 CHIP ID A read instruction from register R0 can be used to confirm that the chip is a WM8352. ADDRESS BIT LABEL DEFAULT DESCRIPTION R0 (00h) Reset/ID 15:0 SW_RESET/C HIP_ID [15:0] 6143h Reading this register returns 6143h. Table 5 Chip ID 11.7.2 DEVICE INFORMATION The read-only register R1 provides additional information about the WM8352 device. ADDRESS BIT LABEL DEFAULT DESCRIPTION R1 (01h) ID 15:1 2 CHIP_REV [3:0] The functional silicon revision - this tracks changes in functionality which are separate from ROM mask settings 11:1 0 CONF_STS [1:0] The state of the configuration pins. This selects what register defaults should be. 7:0 CUST_ID [7:0] The Chip Revision Number R2 (02h) Revision 7:0 MASK_REV [7:0] The ROM mask ID Table 6 Reading Device Information |
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