IP2022 User’s Manual—Register Quick Reference www.ubicom.com 417 C.3.10   SxMODE Register 7 6 5 4 3 2 1 0 PRS3:0 SUBM1:0 CLKS1:0 Name Description PRS3:0 Protocol select. Unassigned encodings are reserved. 0000 =   Disabled
0001 =   10Base-T
0010 =   USB Bus
0011 =   UART
0100 =   I²C
0101 =   SPI/Microwire SUBM1:0 Submode select (in USB mode):         01 =   Low-speed USB interface
        10 =   High-speed USB interface
Submode select (in Microwire and SPI modes): 00 =   Receive on falling edge, transmit on rising edge
01 =   Receive on rising edge, transmit on rising edge
10 =   Receive on falling edge, transmit on falling edge
11 =   Receive on rising edge, transmit on falling edge