AVR JTAG Pinout
AVR JTAG pin names and descriptions are shown in the table below. Pin numbers are shown for MPLAB PICkit Basic direct connection and Debugger Adapter Board 10-pin connection.
| MPLAB PICkit Basic Pin | Adapter Board AVR JTAG Pin | Name | Description |
|---|---|---|---|
| 1 | 7, 8 | NC | Not Connected. |
| 2 | 4 | VDD\VTG* | VDD: MPLAB PICkit Basic providing power
to target (optional) or target providing power to MPLAB PICkit Basic (PTG) VTG: Target voltage reference. The MPLAB PICkit Basic samples the target voltage on this pin in order to power the level converters correctly. The MPLAB PICkit Basic draws less than 3mA from this pin in this mode. |
| 3 | 2, 10 | GND | Ground. All must be connected to ensure that the MPLAB PICkit Basic and the target device share the same ground reference. |
| 4 | 3 | TDO | Test Data Out (data transmitted from the target device into the MPLAB PICkit Basic). |
| 5 | 1 | TCK | Test Clock (clock signal from the MPLAB PICkit Basic into the target device). |
| 6 | 6 | RESET/TAUX | Reset (optional). Used to reset the target device. Connecting this pin is recommended since it allows the MPLAB PICkit Basic to hold the target device in a reset state, which can be essential to debugging in certain scenarios. |
| 7 | 9 | TDI | Test Data In (data transmitted from the MPLAB PICkit Basic into the target device). |
| 8 | 5 | TMS | Test Mode Select (control signal from the MPLAB PICkit Basic into the target device). |
| * Remember to include a decoupling capacitor between this pin and GND. See AVR042: AVR Hardware Design Considerations. | |||