# Qwantum ASIC SPI Communication Interface Qwantum ASIC has two ways of communicating with a host microcontroller: Data Strobe mode and SPI mode. The mode to be used is selected by the voltage on the MODE pin. When the MODE pin is tied to VDD voltage, the part communicates via the SPI Slave Communication Interface. When the MODE pin is tied to ground, the part communicates via the DATA/STROBE Communication Interface. The MODE pin is not intended to toggle while the part is operating, but to be hard-tied to a single voltage at the board level. This section describes the configuration of Qwantum ASIC operating in the SPI mode. --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://developer.magtek.com/qwantum-services/qwantum-asic/draft-versions/draft-of-msr-chip-spi-firmware-implementation-guide/qwantum-asic-spi-communication-interface.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.