AT91SAM7S128 ATMEL [ATMEL Corporation], AT91SAM7S128 Datasheet - Page 19

• Manufacturer Part Number: AT91SAM7S128
• Manufacturer: ATMEL [ATMEL Corporation]

9.6
9.6.1
9.6.2
9.6.3
Table 9-1.
6175BS–ATARM–04-Nov-05
Device
AT91SAM7S256
AT91SAM7S128
AT91SAM7S64
AT91SAM7S321/32
Embedded Flash
Flash Overview
Embedded Flash Controller
Lock Regions
Flash Configuration Summary
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.
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:
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.
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
• The Flash of the AT91SAM7S256 is organized in 1024 pages of 256 bytes. The 262,144
• The Flash of the AT91SAM7S128 is organized in 512 pages of 256 bytes. The 131,072 bytes
• The Flash of the AT91SAM7S64 is organized in 512 pages of 128 bytes. The 65,536 bytes
• The Flash of the AT91SAM7S321/32 is organized in 256 pages of 128 bytes. The 32,768
• The Flash of the AT91SAM7S256/128 contains a 256-byte write buffer, accessible through a
• The Flash of the AT91SAM7S64/321/32 contains a 128-byte write buffer, accessible through
• 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
• getting the end status of the last command
• getting error status
• programming interrupts on the end of the last commands or on errors
bytes are organized in 32-bit words.
are organized in 32-bit words.
are organized in 32-bit words.
bytes are organized in 32-bit words.
32-bit interface.
a 32-bit interface.
clear, etc.
Number of Lock Bits
16
8
16
8
summarizes the configuration of the five devices.
Number of Pages in the Lock Region
64
64
32
32
AT91SAM7S Series Summary
Page Size
256 bytes
256 bytes
128 bytes
128 bytes
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