AT91SAM7S256D-AU Atmel, AT91SAM7S256D-AU Datasheet - Page 21

• Manufacturer Part Number: AT91SAM7S256D-AU
• Description: ARM Microcontrollers - MCU 256K Flash SRAM 64K ARM based MCU
• Manufacturer: Atmel
• Series: SAM7S256r

Specifications of AT91SAM7S256D-AU

• Rohs: yes
• Core: ARM
• Processor Series: AT91SAM
• Data Bus Width: 16 bit/32 bit
• Maximum Clock Frequency: 55 MHz
• Program Memory Size: 256 KB
• Data Ram Size: 64 KB
• On-chip Adc: Yes
• Operating Supply Voltage: 3 V to 3.6 V
• Operating Temperature Range: - 40 C to + 85 C
• Package / Case: LQFP-64
• Mounting Style: SMD/SMT
• Interface Type: 2-Wire, I2S, SPI, USART
• Length: 7 mm

8.7
8.7.1
8.7.2
8.7.3
Memory Mapping
Internal SRAM
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.
Internal ROM
The SAM7S Series embeds an Internal ROM. The ROM contains the FFPI and the SAM-BA program.
The internal ROM is not mapped by default.
Internal 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 8-2. Internal Memory Mapping
The SAM7S512 embeds a high-speed 64-Kbyte SRAM bank.
The SAM7S256 embeds a high-speed 64-Kbyte SRAM bank.
The SAM7S128 embeds a high-speed 32-Kbyte SRAM bank.
The SAM7S64 embeds a high-speed 16-Kbyte SRAM bank.
The SAM7S321 embeds a high-speed 8-Kbyte SRAM bank.
The SAM7S32 embeds a high-speed 8-Kbyte SRAM bank.
The SAM7S161 embeds a high-speed 4-Kbyte SRAM bank.
The SAM7S16 embeds a high-speed 4-Kbyte SRAM bank
The SAM7S512 features two contiguous banks (dual plane) of 256 Kbytes of Flash.
The SAM7S256 features one bank (single plane) of 256 Kbytes of Flash.
The SAM7S128 features one bank (single plane) of 128 Kbytes of Flash.
The SAM7S64 features one bank (single plane) of 64 Kbytes of Flash.
The SAM7S321/32 features one bank (single plane) of 32 Kbytes of Flash.
The SAM7S161/16 features one bank (single plane) of 16 Kbytes of Flash.
256 MBytes
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)
SAM7S Series [DATASHEET]
253 MBytes
1 MBytes
1 MBytes
1 MBytes
6175M–ATARM–26-Oct-12
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