| Jumper | Function |
|---|---|
| TGTVCC | Close to power target device via ISP header |
| SELFPRG | Close to upload firmware to USBasp itself via ISP header |
| SLOWCLK | Close to upload firmware to target device with slow speed (necessary for factory-new microcontrollers) |

USB ISP/TPI Programmer Stick for Atmel AVR Microcontrollers based on ATmega8A