Dual 24-bit ADC — the reason you spec this part
Two 24-bit sigma-delta converters are integrated on-chip, each with its own input channel. That eliminates the need for an external ADC and the associated analog front-end components in a two-channel measurement path. For a three-phase energy meter or a dual-load cell scale, this MCU directly digitises the sensor outputs without multiplexing or gain-stage overhead. The 12 MHz CPU has enough headroom to run the metrology algorithm and communicate results over SPI or UART without stalling the conversion pipeline.