AT91SAM7S256 ATMEL Corporation, AT91SAM7S256 Datasheet - Page 13

• Manufacturer Part Number: AT91SAM7S256
• Description: AT91 ARM THUMB-BASED MICROCONTROLLERS
• Manufacturer: ATMEL Corporation

Memory
Memory Mapping
Internal SRAM
Internal Flash
6117AS–ATARM–20-Oct-04
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The AT91SAM7S256 embeds a high-speed 64-Kbyte SRAM bank. After reset and until
the Remap Command is performed, the SRAM is only accessible at address 0x0020
0000. After Remap, the SRAM also becomes available at address 0x0.
The AT91SAM7S256 features one bank of 256 Kbytes of Flash. At any time, the Flash
is mapped to address 0x0010 0000. It is also accessible at address 0x0 after the reset
and before the Remap Command.
Figure 4. Internal Memory Mapping
256 Kbytes of Flash Memory
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64 Kbytes of Fast SRAM
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256M Bytes
1024 pages of 256 bytes
Fast access time, 30 MHz single-cycle access in Worst Case conditions
Page programming time: 4 ms, including page auto-erase
Page programming without auto-erase: 2 ms
Full chip erase time: 10 ms
10,000 write cycles, 10-year data retention capability
16 lock bits, each protecting 16 sectors of 64 pages
Protection Mode to secure contents of the Flash
Single-cycle access at full speed
AT91SAM7S256 Summary Preliminary
0x0000 0000
0x0010 0000
0x0020 0000
0x000F FFFF
0x001F FFFF
0x002F FFFF
0x0030 0000
0x0FFF FFFF
Flash Before Remap
Undefined Areas
SRAM After Remap
Internal Flash
Internal SRAM
(Abort)
253 M Bytes
1 M Bytes
1 M Bytes
1 M Bytes
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