Human interface on UC3C_EK :
- PWR led is on when power present
- Led 0 is on when USB line is in IDLE mode, and off in SUSPEND mode
- Led 1 blinks when USB host has checked and enabled HID generic interface
- Led 2 and 3 are linked on HID events LED 2 and 3
- Event buttons are linked to switch PB0, PB1
- The PB0 and PB1 can be used to wakeup USB Host in remote wakeup mode.