Data Sheet

780
Atmel | SMART SAM D21 [DATASHEET]
Atmel-42181G–SAM-D21_Datasheet–09/2015
This bit has no effect for any other endpoint but endpoint 0.
z Bits 3:2 – SPDCONF[1:0]: Speed Configuration
These bits select the speed configuration as shown in Table 31-11.
z Bit 1 – UPRSM: Upstream Resume
0: Writing a zero to this bit has no effect.
1: Writing a one to this bit will generate an upstream resume to the host for a remote wakeup.
This bit is cleared when the USB receives a USB reset or once the upstream resume has been sent.
z Bit 0 – DETACH: Detach
0: The device is attached to the USB bus so that communications may occur.
1: It is the default value at reset. The internal device pull-ups are disabled, removing the device from the USB bus.
Table 31-11. SPDCONF Selection
SPDCONF [1:0] Description
0x0 FS: Low speed
0x1 LS: Full Speed
0x2 Reserved
0x3 Reserved