WM8775

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PP Rev 1.8, June 2004

14

POWER-ON-RESET

The WM8775 has an internal power-on-reset circuit. The reset phase is entered at power-up of

supplies. The ADC DSP circuitry is also reset when their respective master clocks are stopped.

Register values are maintained unless either a power-on-reset occurs or a software reset is written.

A software reset will also cause a reset of the ADC DSP.

Figure 8 shows the power-on-reset logic, and Figure 9 shows the reset release characteristics.

Figure 8 Circuit Diagram for Power-on-Reset

Figure 9 Timing Diagram for Power on Sequence