Rev. 2.00, 09/03, page 449 of 690
18.3.16
Data Status Register (DASTS)
DASTS indicates whether the transmit FIFO buffers contain valid data. A bit is set when data is
written to the corresponding FIFO buffer and the packet enable state is set, and cleared when all
data has been transmitted to the host.
Bit
Bit Name
Initial Value
R/W
Description
7, 6
0
R
Reserved
This bit is always read as 0.
5
EP3DE
0
R
EP3 Data Present
This bit is set when the endpoint 3 FIFO buffer
contains valid data.
4
EP2DE
0
R
EP2 Data Present
This bit is set when the endpoint 2 FIFO buffer
contains valid data.
3 to 1
0
R
Reserved
This bit is always read as 0.
0
EP0iDE
0
R
EP0i Data Present
This bit is set when the endpoint 0 FIFO buffer
contains valid data.
18.3.17
FIFO Clear Register (FCLR)
FCLR is a register to initialize the FIFO buffers for each endpoint. Writing 1 to a bit clears all the
data in the corresponding FIFO buffer. Note that the corresponding interrupt flag is not cleared.
Do not clear a FIFO buffer during transfer.
Bit
Bit Name
Initial Value
R/W
Description
7
Undefined
Reserved
The write value should always be 0.
6
EP3CLR
Undefined
W
EP3 Clear
Writing 1 to this bit initializes the endpoint 3 transmit
FIFO buffer.
5
EP1CLR
Undefined
W
EP1 Clear
Writing 1 to this bit initializes both sides of the
endpoint 1 receive FIFO buffer.
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