Renesas M16C Series User Manual page 165

M30245 Group
(4) USB Reset Interrupt
This interrupt is used for detection of the USB reset. This occurs when the USB function control unit
has received reset signal from the host CPU (or detected SE0 on the D+/D- line for at least 2.5µs). At
this time, all the USB internal registers are made into reset state. To resume communication, each
endpoint needs to be initialized. When using the USB reset interrupt, set the interrupt priority level at
USB reset interrupt control register (RSTIC: address 005A
(5) USB Suspend Interrupt
This interrupt is used for detection of inactivity on the USB bus line. The suspend status flag of USB
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power management register (USBPM: address 0282
detected suspend signal on the USB bus line (or not detected any bus activity on the D+/D- line for at
least 3ms). Simultaneously, the USB suspend interrupt occurs.
When using the USB suspend interrupt, set the interrupt priority level at USB suspend interrupt control
register (SUSPIC: address 0056
(6) USB Resume Interrupt
This interrupt is used for detection of activity on the USB bus line while the device is in suspend state.
When the USB function control unit has received resume signal on the USB bus line (or detected
activity on the D+/D- line), the interrupt request occurs, and the USB resume interrupt occurs by
setting "1" to resume interrupt request bit of USB resume interrupt control register (RSMIC: address
0058
When using the USB suspend interrupt, set the interrupt priority level at the RSMIC.
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) is set when the USB function control unit has
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2. USB function