| Signal Name | Function | Type | Active Level |
|---|---|---|---|
| Reset/Test | |||
| NRST | Microcontroller Reset | Input/Output | Low |
| TST | Test Select | Input | – |
| Serial Wire Debug Port/JTAG Boundary Scan | |||
| TCK/SWCLK | Test Clock/Serial Wire Clock | Input | – |
| TDI | Test Data In | Input | – |
| TDO/TRACESWO | Test Data Out/Trace Asynchronous Data Out | Output | – |
| TMS/SWDIO | Test Mode Select/Serial Wire Input/Output | Input | – |
| JTAGSEL | JTAG Selection | Input | High |
| Trace Debug Port | |||
| TRACECLK | Trace Clock | Output | – |
| TRACED0–3 | Trace Data | Output | – |