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Programmable System on Chip. This is a chip containing digital and/or analog blocks which can be configured to create a very wide range of designs. It may refer specifically to the Cypress Semiconductor's PSoC, which integrates configurable analog and digital peripheral functions, memory and a microcontroller on a single chip.

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I2C seems to work but all register reads return 0s

The I2C waveforms on the scope shot look like valid I2C, so that rules out common errors like forgetting to include SCL/SDA pullup resistors, or having too much bus capacitance, etc. At the bit/datali …
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