SAM7X512 View Datasheet(PDF) - Atmel Corporation

Part Name

Description

Manufacturer

SAM7X512

AT91SAM ARM-based Flash MCU

Atmel Corporation 

SAM7X512/256/128 Summary

may be performed even while program or erase functions are being executed in the other mem-

ory plane.

One EFC is embedded in the SAM7X256/128 to control the single plane of 256/128 KBytes.

8.5.3 Lock Regions

8.5.3.1

SAM7X512

Two Embedded Flash Controllers each manage 16 lock bits to protect 16 regions of the flash

against inadvertent flash erasing or programming commands. The SAM7X512 contains 32 lock

regions and each lock region contains 64 pages of 256 bytes. Each lock region has a size of 16

Kbytes.

If a locked-region’s erase or program command occurs, the command is aborted and the EFC

trigs an interrupt.

The 32 NVM bits are software programmable through both of the EFC User Interfaces. The com-

mand “Set Lock Bit” enables the protection. The command “Clear Lock Bit” unlocks the lock

region.

Asserting the ERASE pin clears the lock bits, thus unlocking the entire Flash.

8.5.3.2

SAM7X256

The Embedded Flash Controller manages 16 lock bits to protect 16 regions of the flash against

inadvertent flash erasing or programming commands. The SAM7X256 contains 16 lock regions

and each lock region contains 64 pages of 256 bytes. Each lock region has a size of 16 Kbytes.

If a locked-region’s erase or program command occurs, the command is aborted and the EFC

trigs an interrupt.

The 16 NVM bits are software programmable through the EFC User Interface. The command

“Set Lock Bit” enables the protection. The command “Clear Lock Bit” unlocks the lock region.

Asserting the ERASE pin clears the lock bits, thus unlocking the entire Flash.

8.5.3.3

SAM7X128

The Embedded Flash Controller manages 8 lock bits to protect 8 regions of the flash against

inadvertent flash erasing or programming commands. The SAM7X128 contains 8 lock regions

and each lock region contains 64 pages of 256 bytes. Each lock region has a size of 16 Kbytes.

If a locked-region’s erase or program command occurs, the command is aborted and the EFC

trigs an interrupt.

The 8 NVM bits are software programmable through the EFC User Interface. The command “Set

Lock Bit” enables the protection. The command “Clear Lock Bit” unlocks the lock region.

Asserting the ERASE pin clears the lock bits, thus unlocking the entire Flash.

8.5.4

Security Bit Feature

The SAM7X512/256/128 features a security bit, based on a specific NVM-Bit. When the security

is enabled, any access to the Flash, either through the ICE interface or through the Fast Flash

Programming Interface, is forbidden. This ensures the confidentiality of the code programmed in

the Flash.

This security bit can only be enabled, through the Command “Set Security Bit” of the EFC User

Interface. Disabling the security bit can only be achieved by asserting the ERASE pin at 1, and

21

6120GS–ATARM–07-Apr-11

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