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Section 26 USB 2.0 Host/Function Module
R01UH0134EJ0400 Rev. 4.00 Page 1511 of 2108
Sep 24, 2014
SH7262 Group, SH7264 Group
Table 26.18 Buffer Status Indicated by the BSTS Bit
ISEL or DIR BSTS Buffer Memory State
0 (receiving direction) 0 There is no received data, or data is being received.
Reading from the FIFO port is inhibited.
0 (receiving direction) 1 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.
1 (transmitting
direction)
0 The transmission has not been finished.
Writing to the FIFO port is inhibited.
1 (transmitting
direction)
1 The transmission has been finished.
CPU write is allowed.
Table 26.19 Buffer Status Indicated by the INBUFM Bit
IDIR INBUFM Buffer Memory State
0 (receiving direction) Invalid Invalid
1 (transmitting
direction)
0 The transmission has been finished.
There is no waiting data to be transmitted.
1 (transmitting
direction)
1 The FIFO port has written data to the buffer.
There is data to be transmitted