AT91SAM7S64 datasheet(18/42 Pages) ATMEL

18 / 42 page

6175BS–ATARM–04-Nov-05

AT91SAM7S Series Summary

9.4

AT91SAM7S321/32

•

32 Kbytes of Flash Memory single plane

–

256 pages of 128 bytes

–

Fast access time, 30 MHz single-cycle access in Worst Case conditions

–

Page programming time: 6 ms, including page auto-erase

–

Page programming without auto-erase: 3 ms

–

Full chip erase time: 15 ms

–

10,000 write cycles, 10-year data retention capability

–

8 lock bits, protecting 8 sectors of 32 pages

–

Protection Mode to secure contents of the Flash

•

8 Kbytes of Fast SRAM

–

Single-cycle access at full speed

9.5

Memory Mapping

9.5.1

Internal SRAM

The AT91SAM7S256/128/64/321/32 embeds a high-speed 64/32/16/8/8-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.

9.5.2

Internal ROM

The AT91SAM7S Series embeds an Internal ROM. The ROM contains the FFPI and the

SAM-BA program.

The internal ROM is not mapped by default.

9.5.3

Internal Flash

The AT91SAM7S256/128/64/321/32 features one bank of 256/128/64/32/32 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 9-1.

Internal Memory Mapping

256M Bytes

Flash Before Remap

SRAM After Remap

Undefined Areas

(Abort)

0x000F FFFF

0x001F FFFF

0x002F FFFF

0x0FFF FFFF

1 M Bytes

253 M Bytes

Internal Flash

Internal SRAM

0x0000 0000

0x0010 0000

0x0020 0000

0x0030 0000

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