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WM8580AGEFTV Datasheet(PDF) 21 Page - Wolfson Microelectronics plc |
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WM8580AGEFTV Datasheet(HTML) 21 Page - Wolfson Microelectronics plc |
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21 / 97 page  Production Data WM8580 w PD Rev 4.3 August 2007 21 REGISTER READBACK The WM8580 allows readback of certain registers in 2-wire mode, with data output on the SDO pin. As in 3-wire mode, there are two methods of reading back data: continuous and non-continuous readback. Continuous readback is set by writing to the Readback Control register (see Table 9) to set READEN and CONTREAD to 1, and to set the READMUX bits to select the register to be read back. The status of this register can then be readback using the protocol shown in Figure 10. Figure 10 2-Wire Continuous Readback If CONTREAD is set to zero, the user can read back directly from the register by writing to the register address, to which the device will respond with data. The protocol for this system is shown in Figure 11. Figure 11 2-Wire Non-Continuous Readback SOFTWARE REGISTER RESET Writing to register R53 will cause a register reset, resetting all register bits to their default values. Table 11 Software Reset REGISTER ADDRESS BIT LABEL DEFAULT DESCRIPTION R53 RESET 35h 8:0 RESET n/a Writing any data value to this register will apply a reset to the device registers. |
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