I'm designing my first circuit with an ATmega 32u4 processor. Since I read about the BOOTRST and HWBE fuses I'm confused about the programming of the chip.
- I use a brand new, untouched processor with factory default settings,
- my only access point to the built device are the four USB lines (Vcc,D-,D+,GND),
- I have access neither to the RESET pin nor to the HWB pin
then will it be possible to upload a program to the device with the help of the built in USB boot loader?