AT91SAM7X512 datasheet(21/687 Pages) ATMEL

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6120H–ATARM–17-Feb-09

AT91SAM7X512/256/128 Preliminary

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

memory plane.

One EFC is embedded in the AT91SAM7X256/128 to control the single plane of 256/128

KBytes.

8.5.3

Lock Regions

8.5.3.1

AT91SAM7X512

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

against inadvertent flash erasing or programming commands. The AT91SAM7X512 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

AT91SAM7X256

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

inadvertent flash erasing or programming commands. The AT91SAM7X256 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

AT91SAM7X128

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

inadvertent flash erasing or programming commands. The AT91SAM7X128 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 AT91SAM7X512/256/128 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

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