SH7670 Datasheet, PDF (747/1292 Pages) Renesas Technology Corp – 32-Bit RISC Microcomputer SuperHTM RISC engine Family / SH7670 Series

Bit
Bit Name
7
SHTNAK
6, 5

Section 17 USB 2.0 Host/Function Module (USB)
Initial
Value R/W
0
R/W
All 0 R
Description
Pipe Disabled at End of Transfer
Specifies whether to modify PID to NAK upon the
end of transfer when the selected pipe is in the
receiving direction.
0: Pipe continued at the end of transfer
1: Pipe disabled at the end of transfer
This bit is valid when the selected pipe is PIPE1 to
PIPE5 in the receiving direction.
When software has set this bit to 1 for the selected
pipe in the receiving direction, this module modifies
the PID bits corresponding to the selected pipe to
NAK on determining the end of the transfer. This
module determines that the transfer has ended on
any of the following conditions.
• A short packet (including a zero-length packet) is
successfully received.
• The transaction counter is used and the number
of packets specified by the counter are
successfully received.
Modify these bits while CSSTS is 0 and PID is NAK.
Before modifying these bits after modifying the PID
bits for the selected pipe from BUF to NAK, check
that CSSTS and PBUSY are 0. However, if the PID
bits have been modified to NAK by this module,
checking PBUSY through software is not necessary.
This bit should be cleared to 0 for the pipe in the
transmitting direction.
Reserved
These bits are always read as 0. The write value
should always be 0.
Rev. 1.00 Nov. 14, 2007 Page 721 of 1262
REJ09B0437-0100