KRL PCB top side:
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| 1 | 3(key) | 5 |
| 2 | 4 | 6 |
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| Device 1 Pin Number |
Device 1 Pin Name |
Direction | Device 2 Pin Number |
Device 2 Pin Name |
Description |
| 1 | 4 | +3v3 | |||
| 4 | 2 | gnd | |||
| 7 | 5 | tms/swdio | |||
| 9 | 1 | tck/swclk |

