CHAPTER 12 USB FUNCTION CONTROLLER (USBF)
Preliminary User’s Manual U19014EJ1V0UD
331
(6) UF0 bulk out 1 length register (UF0BO1L)
The UF0BO1L register stores the length of the data held by the UF0BO1 register.
This register is read-only, in 8-bit units. A write access to this register is ignored.
The UF0BO1L register always updates the received data length while it is receiving data. If the final transfer is
abnormal reception, the UF0BO1L register is cleared to 00H, and an interrupt request is not generated. Only if
the reception is normal, the interrupt request is generated, and FW can read as much data from the UF0BO1
register as the value read from the UF0BO1L register. The value of the UF0BO1L register is decremented
each time the UF0BO1 register has been read.
BKO1L7
UF0BO1L
BKO1L6
5
BKO1L5
BKO1L4
3
BKO1L3
2
BKO1L2
1
BKO1L1
BKO1L0
Address
FF77H
After reset
00H
0
4
6
7
Bit position
Bit name
Function
7 to 0
BKO1L7 to
BKO1L0
These bits store the length of the data held by the UF0BO1 register.
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