SBAU012 Datasheet, PDF (10/11 Pages) Texas Instruments – COMPLETE EVALUATION PLATFORM FOR THE PCM1604 SIX-CHANNEL AUDIO D/A CONVERTER

GPO CONTROL WINDOW
The PCM1604 allows the user to select the function of the
ZERO1 through ZERO6 output pins. By default, these pins
operate as zero flag outputs for VOUT1 through VOUT6
respectively. Control Register 11 allows the user to select an
alternate function for these pins. The ZERO1 through
ZERO6 pins may be used as general-purpose outputs, or
GPO1 through GPO6. When configured as GPO pins, Con-
trol Register 12 is utilized to set the output logic level for
each pin.
The GPO Control window provides a simple interface for
utilizing the PCM1604’s GPO function. Figure 10 shows the
default setting of the GPO Control window, where the
ZERO1 through ZERO6 output pins are used as zero flags.
Figure 11 shows the alternate function, where ZERO1 through
ZERO6 are configured as general-purpose logic outputs
GPO1 through GPO6. Check boxes are used to set the
outputs to the ON (logic 1) or OFF (logic 0) states.
The GPO capability is useful for controlling external mute
switches, or other digitally-controlled analog circuit functions.
FIGURE 10. GPO Control Window, Zero Flags Enabled
(Default).
FIGURE 11. GPO Control Window, General Purpose Out-
puts Enabled.
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DEM-DAI1604
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