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CHAPTER 11 USB FUNCTION
11.3 Registers of USB Function
[bit3] BRST: Bus reset detection bit
The detection of USB bus reset is displayed. The BRST bit is an interrupt factor and writing "1" is
ignored. Please clear by writing "0". "1" is read at the read modification write.
BRST
0
1
Note:
Set registers again by initializing the USB Function with RST in the UDCC register when the BRST
bit is detected.
[bit2] WKUP: Wake-Up detection bit
It displays the fact that the USB Function has returned from suspend status. What causes the USB
Function to return from suspend status are a remote wake-up by setting the RESUM bit and a wake-up
from the host request, and the WKUP bit is automatically set only by a return request from the host. The
WKUP bit is an interrupt factor and writing "1" is ignored. Please clear by writing "0". "1" is read at the
read modification write.
WKUP
0
1
Note:
Even if a wake up is caused by a host request, the WKUP bit is not set when the RESUM bit in the
UDCC register is set.
[bit1] SETP:SETUP stage detection bit
It indicates that received data belongs to the Setup stage of USB control transfer. "1" Writing is
disregarded. Please clear by writing "0". "1" is read at the read modification write.
SETP
0
1
Note:
It is not set when automatically responding to any standard command. The SETP bit is not an
interruption factor.
210
USB bus reset undetected and interrupt factors clear
USB bus reset is detected.
HOST factor RESUME undetected and interrupt factors clear
HOST factor RESUME is detected.
SETUP unreception and clear factor
Control forwarding SETUP stage is received.
FUJITSU MICROELECTRONICS LIMITED
MB90335 Series
Operating mode
Operating mode
Operating mode
CM44-10137-6E
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