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WM8321 数据表(PDF) 44 Page - Wolfson Microelectronics plc |
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WM8321 数据表(HTML) 44 Page - Wolfson Microelectronics plc |
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44 / 253 page  WM8321 Production Data w PD, February 2012, Rev 4.0 44 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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