> For the complete documentation index, see [llms.txt](https://developer.magtek.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://developer.magtek.com/qwantum-services/qwantum-asic/documentation/msr-chip-spi-firmware-implementation-guide/qwantum-asic-spi-communication-interface.md).

# 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.


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