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MB90335 Series
[bit14] DRQOIE: Received data interruption permission bit
It allows an interrupt due to the interrupt factor for the EP0O status register "DRQO" to be generated.
DRQOIE
0
1
[bit13] SPKIE: Short packet interruption permission bit
It allows an interrupt due to the interrupt factor for the EP0O status register "SPK" to be generated.
SPKIE
0
1
[bit12, bit11] Undefined bits
These bits are undefined at read. No effect on writing.
[bit10] DRQO: Received data interrupt request bit
It indicates that OUT packet has been successfully transferred from the EP0 host, data has been written
into the receive buffer, and the receive data can be read from the buffer. The DRQO bit is an interrupt
factor and writing "1" is ignored. Please clear by writing "0". "1" is read at the read modification write.
DRQO
0
1
Note:
After the data read of reception buffer is processed, the DRQO must be cleared. Also, writing "0"
when the DRQO is not set is disabled. When the DRQO is set to "1", the reception buffer is not
updated. The buffer is enabled to update when it is cleared. When the OUT packet request is
executed with DRQO set "1", the NAK is responded to the HOST automatically.
[bit9] SPK: Short packet interrupt request bit
It indicates that the number of pieces of transfer data that has been successfully received from the host
is less than a maximum number of packets set in PKS in the EP0 control register (EP0C) (including 0
byte). The SPK bit is a interrupt factor and writing "1" is ignored. Please clear by writing "0". "1" is
read at the read modification write.
SPK
0
1
CM44-10137-6E
Interrupt disabled by DRQO factor
Interruption permission by DRQO factor
Interrupt disabled by SPK factor
Interruption permission by SPK factor
Reading receive data enable state
Maximum number of transfer packets received
Data less than the maximum number of transfer packets received
FUJITSU MICROELECTRONICS LIMITED
CHAPTER 11 USB FUNCTION
11.3 Registers of USB Function
Operating mode
Operating mode
Operating mode
Clearing interrupt cause
Operating mode
217
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