SAM4L Datasheet, PDF (409/1185 Pages) ATMEL Corporation – ATSAM ARM-based Flash MCU

17.7.3.10 Host Start Of Frame Control Register
Register Name:
UHSOFC
Access Type:
Read/Write
Offset:
0x0424
Reset Value:
0x00000000yes
ATSAM4L4/L2
31
30
29
28
27
26
25
24
-
-
-
-
-
-
-
-
23
22
21
20
19
18
17
16
-
-
-
-
-
-
-
FLENCE
15
14
13
12
11
10
9
8
-
-
FLENC[13:0]
FLENC[15:0]
7
6
5
4
3
2
1
0
FLENC[7:0]
During a very short period just before transmitting a start of frame, this register is locked. Thus, after writing, this is
recommended to check the register value, and write this register again if necessary.
This register is cleared upon sending a usb reset.
• FLENCE: Frame Length Control Enable
0:At the beginning of a frame, the internal frame length down-counter is loaded to 11999 to ensure a 1 ms frame rate at 12MHz.
0: In full speed mode, the internal frame length down-counter is loaded to 59999 to ensure a 1 ms frame rate at 60MHz.
0: In high speed mode, the internal frame length down-counter is loaded to 74999 to ensure a 125 us micro-frame rate at
60MHz.
1: At the begining of a frame, the internal frame length down-counter is loaded to the FLENC value.
• FLENC: Frame Length Control
Write this field to configure the frame length
42023C–SAM–02/2013
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