Toshiba H1 Series - Manual (Page 454)

TMP92CZ26A
92CZ26A-451
(4) Low power consumption by control of CLK input signal
When UDC switches to suspend condition, it stops CLK and switches to low power
consumption condition. But as system, this function enables besides low power
consumption by stopping source of CLK that is supplied from external. CLK that
supply to UDC can be controlled clock supply to USB by using
USBINTFR1<INT_SUS> and <INT_CLKSTOP>.
If UDC switches to suspend condition, USBINTFR1<INT_SUS> is set to “1”, and
<INT_CLKSTOP> is set to “1”. After confirmation, stop supply CLK (USBCLK) by
setting “0” to USBCR1<USBCLKE>. If SUSPEND signal is set to “0” by resuming from
host, supply normal CLK to UDC within 3 ms.
When it uses remote wakeup, supplying stable CLK to UDC before using is needed.
When it uses doublers circuit as generation source, above control is needed.