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AT91SAM7X256 Datasheet(PDF) 99 Page - ATMEL Corporation

No. de Pieza. AT91SAM7X256
Descripción  AT91 ARM Thumb-based Microcontrollers
Descarga  664 Pages
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Fabricante  ATMEL [ATMEL Corporation]
Página de inicio  http://www.atmel.com
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AT91SAM7X256 Datasheet(HTML) 99 Page - ATMEL Corporation

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6120D–ATARM–02-Feb-06
AT91SAM7X256/128 Preliminary
20. Embedded Flash Controller (EFC)
20.0.1
Overview
The Embedded Flash Controller (EFC) is a part of the Memory Controller and ensures the inter-
face of the Flash block with the 32-bit internal bus. It increases performance in Thumb Mode for
Code Fetch with its system of 32-bit buffers. It also manages the programming, erasing, locking
and unlocking sequences using a full set of commands.
20.1
Functional Description
20.1.1
Embedded Flash Organization
The Embedded Flash interfaces directly to the 32-bit internal bus. It is composed of several
interfaces:
• One memory plane organized in several pages of the same size
• Two 32-bit read buffers used for code read optimization (see ”Read Operations” on page
100).
• One write buffer that manages page programming. The write buffer size is equal to the page
size. This buffer is write-only and accessible all along the 1 MByte address space, so that
each word can be written to its final address (see ”Write Operations” on page 102).
• Several lock bits used to protect write and erase operations on lock regions. A lock region is
composed of several consecutive pages, and each lock region has its associated lock bit.
• Several general-purpose NVM bits. Each bit controls a specific feature in the device. Refer to
the product definition section to get the GP NVM assignment.
The Embedded Flash size, the page size and the lock region organization are described in the
product definition section.
Table 20-1.
Product Specific Lock and General-purpose NVM Bits
AT91SAM7X256
AT91SAM7X128
Denomination
3
3
Number of General-purpose NVM bits
16
8
Number of Lock Bits


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