NEC mPD78F0730, Preliminary User'S Manual

Page: 312 / 518

CHAPTER 12 USB FUNCTION CONTROLLER (USBF)
Preliminary User’s Manual U19014EJ1V0UD
312
(27) UF0 FIFO clear 1 register (UF0FIC1)
This register clears each FIFO.
This register is write-only, in 8-bit units. If this register is read, 00H is read.
FW can clear the target FIFO by writing 1 to the corresponding bit of this register. The bit to which 1 has been
written is automatically cleared to 0. Writing 0 to the bit is invalid.
The related bits are invalid if each endpoint is not supported by the setting of the UF0E2IM register and the
current setting of the interface.
0 UF0FIC1 0
5
0 0
3
0
2
0
1
BKO1C BKO1CC
Address
FF7AH
After reset
00H
0 4 6 7
Bit position Bit name Function
1 BKO1C This bit clears the FIFOs on both the SIE and CPU sides of the UF0BO1 register (reset
the counter).
1: Clear
When the BKO1NK bit is set to 1 (except when it has been set by FW), the BKO1NK bit
is automatically cleared to 0 by clearing the FIFO.
0 BKO1CC This bit clears only the FIFO on the CPU side of the UF0BO1 register (reset the
counter).
1: Clear
When the BKO1NK bit is set to 1 (except when it has been set by FW), the BKO1NK bit
is automatically cleared to 0 by clearing the FIFO.
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