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Kit Operation
Figure 10. GPIO Tab
The GPIO1 groupbox contains controls for setting options for the GPIO1 pin. The Function control selects
the function that GPIO1 will be used for—it can be used as the ADC Word Clock, as an output clock, as
interrupt pins to signal Short Circuit or AGC Noise Threshold detection, or Button Press or Headset
detection. It may also be used for the alternate I
2
S Word Clock or provide a modulator clock for use with a
digital microphone (see
and the
datasheet). In addition, it can also be used as a
general-purpose I/O pin.
If selected as a General Purpose Input, the state of the GPIO1 pin is reflected by the Input Level
indicator. If selected as a General Purpose Output, the state of the GPIO1 pin can be set by using the
Output Level button.
For use as an interrupt output, the behavior of the interrupt can be selected using the Interrupt Duration
control. A Single, 2ms pulse can be delivered when the selected interrupt occurs, or Continuous Pulses
can be generated signaling the interrupt.
In similar fashion, the GPIO2 pin can also be used for an alternate I
2
S bus, provide interrupt outputs, or be
used with a digital microphone. These options are selected using the Function control in the GPIO2
groupbox. The other controls in this groupbox work the same as the corresponding controls for GPIO1.
When the control interface for the TLV320AIC33 is selected to be I
2
C, the SDA and SCL groupboxes and
controls within them are disabled. If SPI mode is selected, however, the SDA and SCL pins can be used
as GPIO, and selected as either inputs or outputs using the SDA Function and SCL Function controls.
The Output Level and Input Level controls function for these pins in the same way that they do for
GPIO1 or GPIO2.
TLV320AIC33EVM and TLV320AIC33EVM-PDK User's Guide
20
SBAU114 – November 2005