I have my user board with SAM4S2A without external clock , when I want to start write a HEX file to SAM4S2A via Atmel studio 6.2 and SWD BUS so I can not connect to MCU, even read the ID of MCU. Any possible solution? Must be there external clock?
Thank you for reply
Schematic in PDF: https://www.sendspace.com/file/m1jct0