The XR20M1280 and XR16M890 are UARTs that have integrated voltage level shifters. Each UART has at least one pin to select between the various bus interfaces. In addition, the XR16M890 has zero nanosecond address setup and hold times. The data rate for both devices can be as high as 24Mbps and standard features include support for 9-bit multidrop mode. If the UARTs do not need to be operating at the fastest data rates, the core can run at a lower voltage to minimize the power consumption.