Toshiba H1 Series - Manual (Page 450)

TMP92CZ26A
92CZ26A-447
(c) Issuance of NULL packet
If transmitting NULL packet, by input L pulse from EPx_EOPB signal, data of 0
length is set to FIFO, and it can be transferred NULL packet to IN token.
But if it set NULL data to FIFO, it is valid only case of SET signal is L level
condition (case of FIFO is empty). If it answer to receiving IN token by using NULL
packet in a certain period, it is answered by keeping EPx_EOPB signal to L level.
However, if mode is dual packet mode, EPx_DATASET signal assert L level for
showing space of data. Therefore, data condition (both data have not data) cannot
be confirmed from external.
Note: NULL packet can be set also accessing EOP register.
Example:
(2) Interrupt control
Interrupt signal is prepared. This function use adept system.
Detail refers to 3.10.2 900/H1 CPU I/F.
DATASET_A
DATASET_B
EPx_EOPB
NULL
A
Neglect NULL
B
NULL
A
NULL
B
NULL
A
NULL packet
completion of
transmitting