Renesas H8S/2158 User Manual page 631

Bit Bit Name Initial Value R/W
7 — 0
6 EP5TF 0
5 EP4TF 0
Section 18 Universal Serial Bus Interface (USB)
Description
R Reserved
This bit is always read as 0 and cannot be modified.
R/(W) * Endpoint 5 Transfer Failure Flag
Indicates that the endpoint 5 host output transfer has
been completed abnormally.
0: Indicates that the endpoint 5 is in a transfer wait state.
[Clearing condition]
•
0 is written to EP5TF after EP5TF = 1 has been read.
1: Indicates that the endpoint 5 host output transfer
(OUT transaction) has been completed abnormally.
[Setting conditions]
•
Data cannot be received because both receive
buffers for RFU and FIFO become full after an OUT
token has been received (NAK transmission).
•
A communication error occurs after an OUT token
has been received.
R/(W) * Endpoint 4 Transfer Failure Flag
Indicates that the endpoint 4 host input transfer has
been completed abnormally.
0: Indicates that the endpoint 4 is in a transfer wait state.
[Clearing condition]
•
0 is written to EP4TF after EP4TF = 1 has been read.
1: Indicates that the endpoint 4 host input transfer (IN
transaction) has been completed abnormally.
[Setting conditions]
•
An ACK handshake cannot be achieved after an IN
token has been received and data has been
transferred.
•
Data cannot be sent because both receive buffers for
RFU and FIFO are empty after an IN token has been
received (NAK transmission).
Rev. 3.00 Jan 25, 2006 page 577 of 872
REJ09B0286-0300