Transfer Abnormal Completion Interrupt Flag Register 0 (Tffr0) - Renesas H8S/2158 User Manual

Section 18 Universal Serial Bus Interface (USB)

18.3.10 Transfer Abnormal Completion Interrupt Flag Register 0 (TFFR0)

TFFR0 provides status flags (EPTF) indicating that the host input or host output transaction of
each USB function core endpoint has been completed abnormally.
The abnormal completion of a transaction will be detected if a NAK handshake has been received
or a NAK handshake has been sent because no transfer data has been received (FVSR = FIFO
size: FIFO empty) in host input transfer, if a NAK handshake has been sent because the FIFO is
full during data transfer in host output transfer, or if other transfer errors (DATA0/DATA1 toggle
error, bit staffing error, bit count error, CRC error, and a transfer whose byte size exceeds Max
Packet Size, etc.) occur.
TFFR0 is initialized to H'00 by a system reset or function software reset (see section 18.3.16, USB
Control Registers 0 and 1 (USBCR0, USBCR1)).
Rev. 3.00 Jan 25, 2006 page 576 of 872
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