I/O Routing Pin Enable Register
| SWCLKTCKPEN | Serial Wire Clock and JTAG Test Clock Pin Enable | 
| SWDIOTMSPEN | Serial Wire Data and JTAG Test Mode Select Pin Enable | 
| TDOPEN | JTAG Test Debug Output Pin Enable | 
| TDIPEN | JTAG Test Debug Input Pin Enable | 
| SWVPEN | Serial Wire Viewer Output Pin Enable | 
| ETMTCLKPEN | ETM Trace Clock Pin Enable | 
| ETMTD0PEN | ETM Trace Data Pin Enable | 
| ETMTD1PEN | ETM Trace Data Pin Enable | 
| ETMTD2PEN | ETM Trace Data Pin Enable | 
| ETMTD3PEN | ETM Trace Data Pin Enable |