SH7670 Datasheet, PDF (673/1292 Pages) Renesas Technology Corp – 32-Bit RISC Microcomputer SuperHTM RISC engine Family / SH7670 Series

Section 17 USB 2.0 Host/Function Module (USB)
Bit
2 to 0
Bit Name
RHST[2:0]
Initial
Value R/W
000
R
Note: * Only 1 can be written.
Description
Reset Handshake
Indicates the status of the reset handshake.
(1) When the host controller function is selected
000: Communication speed not determined
(powered state or no connection)
1xx: Reset handshake in progress
001: Low-speed connection
010: Full-speed connection
011: High-speed connection
These bits indicate 100 after software has written 1
to USBRST.
If HSE has been set to 1, these bits indicate 111 as
soon as this module detects Chirp-K from the
peripheral device.
This module fixes the value of the RHST bits when
software writes 0 to USBRST and this module
completes SE0 driving.
(2) When the function controller function is selected
000: Communication speed not determined
100: Reset handshake in progress
010: Full-speed connection
011: High-speed connection
If HSE has been set to 1, these bits indicate 100 as
soon as this module detects the USB bus reset.
Then, these bits indicate 011 as soon as this module
outputs Chirp-K and detects Chirp-JK from the USB
host three times. If the connection speed is not fixed
to high speed within 2.5 ms after Chirp-K output,
these bits indicate 010.
If HSE has been set to 0, these bits indicate 010 as
soon as this module detects the USB bus reset.
A DVST interrupt is generated as soon as this
module detects the USB bus reset and then the
value of the RHST bits is fixed to 010 or 011.
Rev. 1.00 Nov. 14, 2007 Page 647 of 1262
REJ09B0437-0100