SH7670 Datasheet, PDF (822/1292 Pages) Renesas Technology Corp – 32-Bit RISC Microcomputer SuperHTM RISC engine Family / SH7670 Series

Section 17 USB 2.0 Host/Function Module (USB)
Table 17.19 Buffer Status Indicated by the BSTS Bit
ISEL or DIR
BSTS
0 (receiving direction) 0
0 (receiving direction) 1
1 (transmitting
0
direction)
1 (transmitting
1
direction)
Buffer Memory State
There is no received data, or data is being received.
Reading from the FIFO port is inhibited.
There is received data, or a zero-length packet has been
received.
Reading from the FIFO port is allowed.
However, because reading is not possible when a zero-
length packet is received, the buffer must be cleared.
The transmission has not been finished.
Writing to the FIFO port is inhibited.
The transmission has been finished.
CPU write is allowed.
Table 17.20 Buffer Status Indicated by the INBUFM Bit
IDIR
INBUFM
0 (receiving direction) Invalid
1 (transmitting
0
direction)
1 (transmitting
1
direction)
Buffer Memory State
Invalid
The transmission has been finished.
There is no waiting data to be transmitted.
The FIFO port has written data to the buffer.
There is data to be transmitted
Rev. 1.00 Nov. 14, 2007 Page 796 of 1262
REJ09B0437-0100