CHAPTER 12 USB FUNCTION CONTROLLER (USBF)
Preliminary User’s Manual U19014EJ1V0UD
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(21) UF0 INT clear 0 register (UF0IC0)
This register controls clearing the interrupt sources indicated by the UF0IS0 register.
This register is write-only, in 8-bit units. If this register is read, the value FFH is read.
FW can clear an interrupt source by writing 0 to the corresponding bit of this register. Even a bit that is
automatically cleared to 0 by hardware can be cleared by FW before it is cleared by hardware. Writing 0 to a
bit of this register automatically sets the bit to 1. Writing 1 is invalid.
BUS
RSTC
UF0IC0
RSU
SPDC
5
1
3
1
2
SET
RQC
1
CLR
RQC
EP
HALTC
Address
FF4AH
After reset
FFH
0
4
1
6
7
Bit position
Bit name
Function
7
BUSRSTC
This bit clears the Bus Reset interrupt.
0: Clear
6
RSUSPDC
This bit clears the Resume/Suspend interrupt.
0: Clear
2
SETRQC
This bit clears the SET_RQ interrupt.
0: Clear
1
CLRRQC
This bit clears the CLR_RQ interrupt.
0: Clear
0
EPHALTC
This bit clears the EP_Halt interrupt.
0: Clear
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