57.8.8.1 MCP3910 Protocol Overview

In Two-Pin mode, the SPI can easily interface to analog front-end ADC devices such as MCP3910. The MCP3910 device data output (SDO) is the host for the MOSI line, although the SPI generates the SPCK clock. FLEX_SPI_CSRx.SCBR defines the frequency of the SPCK output clock. The MISO line is not used.

SPI Two-Pin mode connects with up to four two-pin devices. Each MCP3910 product sends four times the same frame. See the following figure.