Toshiba TXZ Series Reference Manual page 51

not started by <TRXE> after the setup to "1" (Communication is enable), when slave operation, state
flag [TSPIxSR]<TSPISIUE> is not set to "0" (Modification is enabled). In spite of enable
communication in slave device when communication of a master device is not started, please perform
re-set it up , after the slave device performs software reset by [TSPIxCR0]<SWRST>.
Note4: In the slave operation, if <TRXE> is rewritten to "0" (communication prohibited) when data remains in
the transmission buffer (FIFO) during transmission, transmission buffer (FIFO) should be cleared by
[TSPIxCR3]<TFEMPCLR>, or should be performed software reset by [TSPIxCR0]<SWRST>, then
re-set it up.
Note5: When slave operation or SIO mode is selected, do not select TSPIxCS0/1/2/3 as the port pin setting.
Note6: It cannot set up at the time of trigger transmission
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TXZ Family
Serial Peripheral Interface
Rev. 3.0