SAM7S64_14 Datasheet, PDF (582/775 Pages) ATMEL Corporation – Internal High-speed Flash

37.10.3 Embedded Flash Characteristics
The maximum operating frequency is given in Table 37-24 but is limited by the Embedded Flash access time when the pro-
cessor is fetching code out of it. Table 37-24 gives the device maximum operating frequency depending on the FWS field of
the MC_FMR register. This field defines the number of wait states required to access the Embedded Flash Memory.
Table 37-24. Embedded Flash Wait States
FWS⁽¹⁾
Read Operations
0
1 cycle
1
2 cycles
2⁽²⁾
3 cycles
3⁽²⁾
4 cycles
Maximum Operating Frequency (MHz)
30
55
55
55
Notes: 1. FWS = Flash Wait States
2. It is not necessary to use 2 or 3 wait states because the flash can operate at maximum frequency with only 1 wait state.
Table 37-25. AC Flash Characteristics
Parameter
Conditions
Program Cycle Time
per page including auto-erase
per page without auto-erase
Full Chip Erase
Min
Max
Units
6
ms
3
ms
15
ms
SAM7S Series [DATASHEET]
6175M–ATARM–26-Oct-12
582