SH7205 Datasheet, PDF (1222/1904 Pages) Renesas Technology Corp – Renesas 32-Bit RISC Microcomputer SuperHTM RISC engine Family / SH7200 Series

Section 24 USB 2.0 Host/Function Module (USB)
24.3.22 BRDY Interrupt Status Register (BRDYSTS)
BRDYSTS is used to confirm the BRDY interrupt status for each pipe. The conditions for
generation and clearing of the BRDY interrupt status are different depending on the settings of the
BRDYM bit and the BFRE bit for each pipe.
This register is initialized by a power-on reset.
Bit: 15 14 13 12 11 10 9
8
7
6
5
4
3
2
1
0
—
—
—
—
—
—
PIPE9 PIPE8 PIPE7 PIPE6 PIPE5 PIPE4 PIPE3 PIPE2 PIPE1 PIPE0
BRDY BRDY BRDY BRDY BRDY BRDY BRDY BRDY BRDY BRDY
Initial value: -
-
-
-
-
-
0
0
0
0
0
0
0
0
0
0
R/W: R
R
R
R
R
R R/W* R/W* R/W* R/W* R/W* R/W* R/W* R/W* R/W* R/W*
(1) When BRDYM = 0 and BFRE = 0 are Set
With this setting, the BRDY interrupt indicates that the FIFO ports have become accessible.
In the event of the following conditions, an internal BRDY interrupt request trigger is generated
and the bit corresponding to the pipe that caused the request trigger is set to 1.
(a) Conditions for Pipes in the Transmitting Direction
• The DIR bit is modified from 0 to 1.
• Packet transmission in the pertinent pipe has completed while the FIFO buffer assigned to the
pipe is not writable by the CPU (i.e., when 0 is read from the BSTS bit).
If continuous transmission/reception mode has been set, a request trigger is generated on
completion of transmitting the data for one plane of FIFO buffer.
• When the FIFO buffer is configured as double buffers, writing to one buffer has completed
while the other buffer is empty. Even if transmission from one FIFO buffer has completed
while the other buffer is being written to, a request trigger is not generated until the writing to
the buffer is completed.
• Buffer flush by this module has occurred in an isochronous transfer pipe.
• The FIFO buffer has become writable from a non-writable state by writing 1 to the ACLRM
bit.
Request triggers are not generated for the DCP (that is, in data transfer by control transfer).
Rev. 1.00 Mar. 25, 2008 Page 1190 of 1868
REJ09B0372-0100