The application must modify this register before enabling the endpoint. Once the endpoint is enabled using endpoint enable bit of the DOEPCTLx registers (EPENA bit in DOEPCTLx), the core modifies this register. The application can only read this register once the core has cleared the endpoint enable bit.
XFRSIZ | XFRSIZ |
PKTCNT | PKTCNT |
RXDPID_STUPCNT | RXDPID_STUPCNT |