AT91SAM7S64 datasheet(19/42 Pages) ATMEL

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6175BS–ATARM–04-Nov-05

AT91SAM7S Series Summary

9.6

Embedded Flash

9.6.1

Flash Overview

• The Flash of the AT91SAM7S256 is organized in 1024 pages of 256 bytes. The 262,144

bytes are organized in 32-bit words.

• The Flash of the AT91SAM7S128 is organized in 512 pages of 256 bytes. The 131,072 bytes

are organized in 32-bit words.

• The Flash of the AT91SAM7S64 is organized in 512 pages of 128 bytes. The 65,536 bytes

are organized in 32-bit words.

• The Flash of the AT91SAM7S321/32 is organized in 256 pages of 128 bytes. The 32,768

bytes are organized in 32-bit words.

• The Flash of the AT91SAM7S256/128 contains a 256-byte write buffer, accessible through a

32-bit interface.

• The Flash of the AT91SAM7S64/321/32 contains a 128-byte write buffer, accessible through

a 32-bit interface.

The Flash benefits from the integration of a power reset cell and from the brownout detector.

This prevents code corruption during power supply changes, even in the worst conditions.

When Flash is not used (read or write access), it is automatically placed into standby mode.

9.6.2

Embedded Flash Controller

The Embedded Flash Controller (EFC) manages accesses performed by the masters of the sys-

tem. It enables reading the Flash and writing the write buffer. It also contains a User Interface,

mapped within the Memory Controller on the APB. The User Interface allows:

• programming of the access parameters of the Flash (number of wait states, timings, etc.)

• starting commands such as full erase, page erase, page program, NVM bit set, NVM bit

clear, etc.

• getting the end status of the last command

• getting error status

• programming interrupts on the end of the last commands or on errors

The Embedded Flash Controller also provides a dual 32-bit Prefetch Buffer that optimizes 16-bit

access to the Flash. This is particularly efficient when the processor is running in Thumb mode.

9.6.3

Lock Regions

The Embedded Flash Controller manages 16/8 lock bits to protect 16/8 regions of the flash

against inadvertent flash erasing or programming commands.

Table 9-1 summarizes the configuration of the five devices.

Table 9-1.

Flash Configuration Summary

Device

Number of Lock Bits

Number of Pages in the Lock Region

Page Size

AT91SAM7S256

256 bytes

AT91SAM7S128

256 bytes

AT91SAM7S64

128 bytes

AT91SAM7S321/32

128 bytes

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