23.3.1 Standard and Low-Voltage Operation

When operating in the standard range of 1.62V-5.5V, the VDDIOxMD configuration bit should be configured to the “Standard Operating Range” setting. In this mode, the MVIO pads and the V_DDIOx voltage monitor are fully functional. The VDDIOxRDY bit in the MVIOSTAT register reflects the status of the V_DDIOx supply voltage. Refer to Table 23-2 and Table 23-3 for a list of input buffers and output drivers that are active in this operating range.

When operating in the low-voltage range of 0.95V-1.62V, the VDDIOxMD configuration bit should be configured to the “Low-Voltage Operating Range” setting. In this mode, the MVIO circuitry in the pads are held in reset. Since the voltage monitor on the V_DDIOx domain is inactive at V_DDIOx < 1.62V, the voltage monitor on the V_DD domain is used instead to enable limited functionality with certain I3C and I²C buffers and drivers. The VDDIOxRDY bit is always high regardless of the V_DDIOx supply voltage representing that the corresponding MVIO domain is active in limited capacity. Refer to Table 23-2 and Table 23-3 for a list of input buffers and output drivers that are active in this operating range.