SAM4L Datasheet, PDF (399/1185 Pages) ATMEL Corporation – ATSAM ARM-based Flash MCU

17.7.3 USB Host Registers
17.7.3.1 Host General Control Register
Register Name:
UHCON
Access Type:
Read/Write
Offset:
0x0400
Reset Value:
0x00000000
ATSAM4L4/L2
31
30
29
28
27
26
25
24
-
-
-
-
-
-
-
-
23
22
21
20
19
18
17
16
-
-
-
-
-
-
-
-
15
14
13
12
11
10
9
8
-
-
-
-
-
RESUME
RESET
SOFE
7
6
5
4
3
2
1
0
-
-
-
-
-
-
-
-
•
•
• RESUME: Send USB Resume
Writing a zero to this bit has no effect.
Writing a one to this bit will generate a USB Resume on the USB bus. This bit should only be done when the start of frame
generation is enabled (SOFE bit is one).
This bit is cleared when the USB Resume has been sent or when a USB reset is requested.
• RESET: Send USB Reset
Writing a zero to this bit might be useful when a device disconnection is detected (UHINT.DDISCI is one) while a USB Reset is
being sent.
Writing a one to this bit will generate a USB Reset on the USB bus.
This bit is cleared when the USB Reset has been sent.
• SOFE: Start of Frame Generation Enable
Writing a zero to this bit will disable the SOF generation and to leave the USB bus in idle state.
Writing a one to this bit will generate SOF on the USB bus in full speed mode and keep it alive in low speed mode.
This bit is set when a USB reset is requested or an upstream resume interrupt is detected (UHINT.RXRSMI).
42023C–SAM–02/2013
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