Datasheet

Section 22 USB Function Module (USB)
Rev. 2.00 Aug. 20, 2008 Page 846 of 1198
REJ09B0403-0200
22.3.19 Data Status Register (DASTS)
DASTS indicates whether the transmit FIFO buffers contain valid data. A bit in this register is set
when data is written to the corresponding FIFO buffer and the packet enable bit is set. A bit in this
register is cleared when all data has been transmitted to the host, or when the FIFO clear bit for the
corresponding endpoint in the FIFO clear register (FCLR) is set.
Bit Bit Name
Initial
Value
R/W Description
7
6


0
0
R
R
Reserved
These bits are always read as 0. The initial value
should not be changed.
5 EP3 DE 0 R EP3 Data Present
This bit is set when the endpoint 3 FIFO buffer
contains valid data.
4 EP2 DE 0 R EP2 Data Present
This bit is set when the endpoint 2 FIFO buffer
contains valid data.
3 to 1
 All 0 R
Reserved
These bits are always read as 0.
0 EP0i DE 0 R EP0i Data Present
This bit is set when the endpoint 0 FIFO buffer
contains valid data.