SAM7S256_14 Datasheet, PDF (198/775 Pages) ATMEL Corporation – ARM-based Flash MCU

Figure 25-4. Switch Master Clock from Main Clock to Slow Clock
Slow Clock
Main Clock
MCKRDY
Master Clock
Write PMC_MCKR
Figure 25-5. Change PLL Programming
Main Clock
PLL Clock
LOCK
MCKRDY
Master Clock
Write CKGR_PLLR
Main Clock
SAM7S Series [DATASHEET]
6175M–ATARM–26-Oct-12
198