ARM JTAG header pinout
| 1 | VREF |  | | VSUPPLY | 2 |
| 3 | nTRST | | | GND | 4 |
| 5 | TDI | | | GND | 6 |
| 7 | TMS | | | GND | 8 |
| 9 | TCK | | | GND | 10 |
| 11 | RTCK | | | GND | 12 |
| 13 | TDO | | | GND | 14 |
| 15 | nSRST | | | GND | 16 |
| 17 | DBGRQ | | | GND | 18 |
| 19 | DGBACK | | | GND | 20 |
| 1 | VREF | | | VSUPPLY | 2 |
| 3 | nTRST | | | GND | 4 |
| 5 | TDI | | | GND | 6 |
| 7 | TMS | | | GND | 8 |
| 9 | TCK | | | GND | 10 |
| 11 | RTCK | | | GND | 12 |
| 13 | TDO | | | GND | 14 |
| 15 | nSRST | | | GND | 16 |
| 17 | DBGRQ | | | GND | 18 |
| 19 | DGBACK | | | GND | 20 |