Rev. 3.0, 10/02, page 468 of 686
15.3.29
USB Interrupt Flag Register 3 (UIFR3)
UIFR3 is an interrupt flag register indicating the USB status. If the corresponding bit is set to 1,
the corresponding
EXIRQ0
,
EXIRQ1
, or
IRQ6
interrupt is requested from the CPU. VBUSi,
SPRSi, SETI, SETC, SOF, and CK48READY flags can be cleared by writing 0. Writing 1 to them
is invalid and causes no operation.
VBUSs and SPRSs are status flags and cannot be cleared.
Bit
Bit Name
Initial Value
R/W
Description
7
CK48READ
Y
0
R/(W)
*
USB Operating Clock (48 MHz) Stabilization Detection
Set to 1when the 48-MHz USB operating clock
stabilization time has been automatically counted after
USB module rest mode cancellation. The
corresponding interrupt output is
EXIRQ0
or
EXIRQ1
.
CK48READY can also operate in USB interface
software reset state ( the UIFRST bit of UCTLR is set
to 1).
Note that USB operating clock stabilization time differs
according to the clock source, refer to the UCKS3 to
UCKS0 bits of the UCTLR.
6
SOF
0
R/(W)
*
Start of Frame Packet Detection
Set to 1 if the SOF packet is detected. This flag can
be used to start time stamp check, EP3i transmit data
write, or EP3o receive data read timing in EP3
isochronous transfer. The corresponding interrupt
output is
EXIRQ0
or
EXIRQ1
.
5
SETC
0
R/(W)
*
Set_Configuration Command Detection
Set to 1 if the Set_Configuration command is
detected. The corresponding interrupt output is
EXIRQ0
or
EXIRQ1
.
4
SETI
0
R/(W)
*
Set_Inferface Command Detection
Set to 1 if the Set_Interface command is detected.
The corresponding interrupt output is
EXIRQ0
or
EXIRQ1
.
Note:
*
The write value should always be 0 to clear this flag.
Summary of Contents for H8S/2215 Series
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