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Section 26 USB 2.0 Host/Function Module
R01UH0134EJ0400 Rev. 4.00 Page 1361 of 2108
Sep 24, 2014
SH7262 Group, SH7264 Group
Bit Bit Name
Initial
Value R/W Description
2 to 0 RHST[2:0] 000 R 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 1 has been written 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 0
is written to USBRST and this module completes
SE0 driving.
When the UTST bits are set to 1xxx (when a host
test mode is specified), the RHST bits indicate 011.
(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.
Note: * Only 1 can be written.