Dan, if you are using self-boot mode then ADAU1701 is running I2C as master rather than SPI. You could use one of the digital outs to send signal to another processor. You could use two 1701s for example, but you should evaluate whether you want to do that or use something like 1446 instead. I chose to use two 1701s because I needed the analog I/O and it's a physically smaller solution than 1446 (plus I/O), but 1446 still has almost twice the processing of two 1701s and a larger library too.
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