SAM7X256_14 Datasheet, PDF (109/662 Pages) ATMEL Corporation – ARM-based Flash MCU

• FMCN: Flash Microsecond Cycle Number
Before writing Non Volatile Memory bits (Lock bits, General Purpose NVM bit and Security bits), this field must be set to the num-
ber of Master Clock cycles in one microsecond.
When writing the rest of the Flash, this field defines the number of Master Clock cycles in 1.5 microseconds. This number must be
rounded up.
Warning: The value 0 is only allowed for a master clock period superior to 30 microseconds.
Warning: In order to guarantee valid operations on the flash memory, the field Flash Microsecond Cycle Number (FMCN) must
be correctly programmed.
SAM7X Series [DATASHEET]
6120K–ATARM–11-Feb-14
109