SH7764 Datasheet, PDF (1013/1752 Pages) Renesas Technology Corp – Renesas 32-Bit RISC Microcomputer SuperHTM RISC Engine Family SH-4A Series

Section 21 USB 2.0 Host/Function Module (USB)
1. Conditions under which µSOF lock monitoring begins
USBE = 1
2. Conditions under which µSOF lock monitoring stops
USBE = 0, a USB bus reset is received, or suspended state is detected.
Peripheral Device
SOF interpolation
µSOF packet
µSOF number 6 7 0 1 2 3 4 5 6 7 0 1 2 3 4 5 6 7 0 1
Frame number
3
SOFR interrupt
4
6
SOF interpolation function
µSOF lock
SOF interpolation SOF interpolation
µSOF packet
µSOF number
µSOF lock
701
67 0
70 1
SOFR interrupt
Not locked
Not locked
70 1 2
70 1
SOF interpolation,
missing
Figure 21.8 Example of SOFR Interrupt Output Timing
(7) VBUS Interrupt
If there has been a change in the VBUS pin, the VBUS interrupt is generated. The level of the
VBUS pin can be checked with the VBSTS bit in INTSTS0. Whether the host controller is
connected or disconnected can be confirmed using the VBUS interrupt. However, if the system is
activated with the host controller connected, the first VBUS interrupt is not generated because
there is no change in the VBUS pin.
(8) Resume Interrupt
The RESM interrupt is generated when the device state is the suspended state, and the USB bus
state has changed (from J-state to K-state, or from J-state to SE0). Recovery from the suspended
state is detected by means of the resume interrupt.
(9) BCHG Interrupt
The BCHG interrupt is generated when the USB bus state has changed. The BCHG interrupt can
be used to detect whether or not the peripheral device is connected when the host controller
function has been selected and can also be used to detect a remote wakeup. The BCHG interrupt is
Rev. 1.00 Nov. 22, 2007 Page 957 of 1692
REJ09B0360-0100