SLAU723A October 2017 – October 2018 MSP432E401Y , MSP432E411Y
Figure 3-4 shows the format for the 1-bit BYPASS Data Register defined by the IEEE Standard 1149.1. The standard requires that every JTAG-compliant microcontroller implement either the BYPASS instruction or the IDCODE instruction as the default instruction. The LSB of the BYPASS Data Register is defined to be a 0 to distinguish it from the IDCODE instruction, which has an LSB of 1. This definition allows auto-configuration test tools to determine which instruction is the default instruction.