SAM7S256_14 Datasheet, PDF (502/775 Pages) ATMEL Corporation – ARM-based Flash MCU

The UDP peripheral requires two clocks: one peripheral clock used by the Master Clock domain (MCK) and a 48
MHz clock (UDPCK) used by the 12 MHz domain.
A USB 2.0 full-speed pad is embedded and controlled by the Serial Interface Engine (SIE).
The signal external_resume is optional. It allows the UDP peripheral to wake up once in system mode. The host is
then notified that the device asks for a resume. This optional feature must be also negotiated with the host during
the enumeration.
SAM7S Series [DATASHEET]
6175M–ATARM–26-Oct-12
502