Texas Instruments TLV320AIC12KEVMB-K appendix Control Register 1 Tab Control Register 2 Tab

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Figure 7. Control Register 1 Tab

6.8.2Control Register 2 Tab

The Turbo Mode control (Figure 8) sets the SCLK frequency to 16×FS×(number of devices)×mode or MCLK÷P, where number of devices is the number of codecs in cascade (default=1) and the mode is 1 for continuous data transfer mode and 2 for programming mode. The Host Port Control can be used to assign different functions to the SDA pin or to set SCL and SDA for I2C or S2C. When using the USB-MODEVM Audio Interface Configuration the Host Port Control must be set to SDA/SCL are I2C interface pins.

If the host interface is not needed, the two pins of SCL and SDA can be programmed to become general-purpose I/Os. If selected to be used as I/O pins, the SDA and SCL pins become output and input pins respectively, determined by D1 and D0. SDA can then be set to 1 or 0 by toggling the General Purpose Output control.

The Decimation/Interpolation filter bypass button bypasses the filters selected in register 1. This can be useful when using a DSP to apply such filters. The I2C Base Address control allows the user to select the first three bits (MSB first) of the device's 7-bit I2C address. The last 4 bits of the address will depend on the automatic cascade detection (ACD) feature of SMARTDM™, which sets the device position.

16 TLV320AIC12KEVMB-K and TLV320AIC14KEVMB-K User's Guide SLAU229B–October 2007–Revised August 2008

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