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CHAPTER 11 USB FUNCTION
11.3 Registers of USB Function
[bit10] NULE: NULL automatic transfer enable bit
This bit sets up a mode where the last packet transfer will be detected and 0-byte data transfer will be
automatically sent when IN- direction data transfer request arrives if the automatic buffer transfer mode
is set (DMAE=1).
NULE
0
1
Note:
Setting the NULE bit has no effect on communications when transferring data to OUT direction or the
automatic buffer transfer mode is not set.
[bit9] STAL:STALL set bit
Setting the STAL bit can put EndPoint in STALL status (STALL response).
STAL
0
1
Note:
STALL keeps responding for HOST while setting the STAL bit. The USB Function can return from
STALL status with the ClearFutcher command from the host after the STAL bit was deselected.
EP2 to EP5: [bit8, bit7] Reserved bits
These bits are reserved bit. Please write "00
EP1:[bit8 to bit0] PKS:Packet size set bits
EP2 to EP5:[bit6 to bit0] PKS:Packet size set bits
The number of maximum forwarding by one packet is specified. The following lists a maximum
number of transfer packets that can be specified in each of EndPoint1 to EndPoint5.
EndPoint
1
2 to 5
206
Release of the NULL automatic TRANSFER mode
Set of the NULL automatic TRANSFER mode
Set of state of STALL (STALL response)
B
Max. number of transfer
256 bytes (The odd can be set).
64 bytes (The odd can be set).
FUJITSU MICROELECTRONICS LIMITED
Operating mode
Operating mode
Release of state of STALL
". These bist always read "00
Range which can be set
MB90335 Series
".
B
001
to 100
H
H
01
to 40
H
H
CM44-10137-6E
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