AT91SAM7S64 datasheet(23/50 Pages) ATMEL

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6175GS–ATARM–24-Dec-08

AT91SAM7S Series Summary

8.8.3

Lock Regions

8.8.3.1

AT91SAM7S512

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

against inadvertent flash erasing or programming commands. The AT91SAM7S512 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

LOCKE bit in the MC_FSR register rises and the interrupt line rises if the LOCKE bit has been

written at 1 in the MC_FMR register.

The 16 NVM bits (or 32 NVM bits) are software programmable through the corresponding 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.

8.8.3.2

AT91SAM7S256

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

inadvertent flash erasing or programming commands. The AT91SAM7S256 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

LOCKE bit in the MC_FSR register rises and the interrupt line rises if the LOCKE bit has been

written at 1 in the MC_FMR register.

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.

8.8.3.3

AT91SAM7S128

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

inadvertent flash erasing or programming commands. The AT91SAM7S128 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

LOCKE bit in the MC_FSR register rises and the interrupt line rises if the LOCKE bit has been

written at 1 in the MC_FMR register.

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.

8.8.3.4

AT91SAM7S64

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

inadvertent flash erasing or programming commands. The AT91SAM7S64 contains 16 lock

regions and each lock region contains 32 pages of 128 bytes. Each lock region has a size of 4

Kbytes.

AT91SAM7S64 Datasheet(PDF) 23 Page - ATMEL Corporation

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