Toshiba TLCS-900/H1 Series Manual page 279

(4) Low power consumption by control of CLK input signal
When the UDC switches to suspend condition, it stops CLK and switches to low
power consumption condition. But as system, this function enables low power
consumption by stopping source of CLK. CLK that is supplied to the UDC can be
controlled by
USBCR1<USBCLKE>.
If UDC switches to suspend condition, USBINTFR1<INT_SUS> is set to "1", and
<INT_CLKSTOP> is set to "1". After confirmation, stop CLK supply (USBCLK) by
setting "0" to USBCR1<USBCLKE>. If SUSPEND condition is released by resuming
from host, supply normal CLK to UDC within 3 ms.
When remote wakeup is used, it is necessary to supply a stable CLK to the UDC
before use. When doubler circuit is used as generation source, the above control is
needed.
using USBINTFR1<INT_SUS>,
92CH21-277
TMP92CH21
<INT_CLKSTOP>
2009-06-19
and