AT91SAM7X512 ATMEL Corporation, AT91SAM7X512 Datasheet - Page 20

• Manufacturer Part Number: AT91SAM7X512
• Description: AT91 ARM Thumb-based Microcontrollers
• Manufacturer: ATMEL Corporation

8.5
8.5.1
8.5.2
20
Embedded Flash
AT91SAM7X512/256/128 Preliminary Summary
Flash Overview
Embedded Flash Controller
Figure 8-3.
The Flash contains a 256-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.
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.
Two EFCs are embedded in the AT91SAM7X512 to control each bank of 256 KBytes. Dual-
plane organization allows concurrent read and program functionality. Read from one memory
• The Flash of the AT91SAM7X512 is organized in two banks (dual plane) of 1024 pages of
• The Flash of the AT91SAM7X256 is organized in 1024 pages of 256 bytes (single plane). It
• The Flash of the AT91SAM7X128 is organized in 512 pages of 256 bytes (single plane). It
• 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
256 bytes. The 524,288 bytes are organized in 32-bit words.
reads as 65,536 32-bit words.
reads as 32,768 32-bit words.
clear, etc.
256M Bytes
Internal Memory Mapping with GPNVM Bit 2 = 1
0x0000 0000
0x0010 0000
0x0020 0000
0x000F FFFF
0x001F FFFF
0x002F FFFF
0x0030 0000
0x0FFF FFFF
0x0040 0000
0x003F FFFF
Flash Before Remap
SRAM After Remap
Undefined Areas
Internal FLASH
Internal SRAM
Internal ROM
(Abort)
252 M Bytes
1 M Bytes
1 M Bytes
1 M Bytes
1 M Bytes
6120DS–ATARM–03-Oct-06